添加android ocr demo

Signed-off-by: authorfu <fujiayi2012@gmail.com>

deploy/android_demo/.gitignore

+*.iml
+.gradle
+/local.properties
+/.idea/*
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+

deploy/android_demo/README.md

+# 如何快速测试
+### 1. 安装最新版本的Android Studio
+可以从https://developer.android.com/studio下载。本Demo使用是4.0版本Android Studio编写。
+
+### 2. 按照NDK 20 以上版本 
+Demo测试的时候使用的是NDK 20b版本，20版本以上均可以支持编译成功。
+
+如果您是初学者，可以用以下方式安装和测试NDK编译环境。
+点击 File -> New ->New Project，  新建  "Native C++" project
+
+### 3. 导入项目
+点击 File->New->Import Project...， 然后跟着Android Studio的引导导入
+
+
+# 获得更多支持
+前往[端计算模型生成平台EasyEdge](https://ai.baidu.com/easyedge/app/open_source_demo?referrerUrl=paddlelite)，获得更多开发支持：
+
+- Demo APP：可使用手机扫码安装，方便手机端快速体验文字识别
+- SDK：模型被封装为适配不同芯片硬件和操作系统SDK，包括完善的接口，方便进行二次开发

deploy/android_demo/app/.gitignore

+/build

deploy/android_demo/app/build.gradle

+import java.security.MessageDigest
+
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 28
+    defaultConfig {
+        applicationId "com.baidu.paddle.lite.demo.ocr"
+        minSdkVersion 15
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        externalNativeBuild {
+            cmake {
+                cppFlags "-std=c++11 -frtti -fexceptions -Wno-format"
+                arguments '-DANDROID_PLATFORM=android-23', '-DANDROID_STL=c++_shared' ,"-DANDROID_ARM_NEON=TRUE"
+            }
+        }
+        ndk {
+            // abiFilters "arm64-v8a", "armeabi-v7a"
+            abiFilters   "arm64-v8a", "armeabi-v7a"
+            ldLibs "jnigraphics"
+        }
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    externalNativeBuild {
+        cmake {
+            path "src/main/cpp/CMakeLists.txt"
+            version "3.10.2"
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
+    implementation 'com.android.support:appcompat-v7:28.0.0'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
+    implementation 'com.android.support:design:28.0.0'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+}
+
+def archives = [
+        [
+                'src' : 'https://paddlelite-demo.bj.bcebos.com/libs/android/paddle_lite_libs_v2_6_1.tar.gz',
+                'dest': 'PaddleLite'
+        ],
+        [
+                'src' : 'https://paddlelite-demo.bj.bcebos.com/libs/android/opencv-4.2.0-android-sdk.tar.gz',
+                'dest': 'OpenCV'
+        ],
+        [
+                'src' : 'https://paddleocr.bj.bcebos.com/deploy/lite/ocr_v1_for_cpu.tar.gz',
+                'dest' : 'src/main/assets/models/ocr_v1_for_cpu'
+        ]
+]
+
+task downloadAndExtractArchives(type: DefaultTask) {
+    doFirst {
+        println "Downloading and extracting archives including libs and models"
+    }
+    doLast {
+        // Prepare cache folder for archives
+        String cachePath = "cache"
+        if (!file("${cachePath}").exists()) {
+            mkdir "${cachePath}"
+        }
+        archives.eachWithIndex { archive, index ->
+            MessageDigest messageDigest = MessageDigest.getInstance('MD5')
+            messageDigest.update(archive.src.bytes)
+            String cacheName = new BigInteger(1, messageDigest.digest()).toString(32)
+            // Download the target archive if not exists
+            boolean copyFiles = !file("${archive.dest}").exists()
+            if (!file("${cachePath}/${cacheName}.tar.gz").exists()) {
+                ant.get(src: archive.src, dest: file("${cachePath}/${cacheName}.tar.gz"))
+                copyFiles = true; // force to copy files from the latest archive files
+            }
+            // Extract the target archive if its dest path does not exists
+            if (copyFiles) {
+                copy {
+                    from tarTree("${cachePath}/${cacheName}.tar.gz")
+                    into "${archive.dest}"
+                }
+            }
+        }
+    }
+}
+preBuild.dependsOn downloadAndExtractArchives
\ No newline at end of file

deploy/android_demo/app/proguard-rules.pro

+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

deploy/android_demo/app/src/androidTest/java/com/baidu/paddle/lite/demo/ocr/ExampleInstrumentedTest.java

+package com.baidu.paddle.lite.demo.ocr;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.baidu.paddle.lite.demo", appContext.getPackageName());
+    }
+}

deploy/android_demo/app/src/main/AndroidManifest.xml

+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.baidu.paddle.lite.demo.ocr">
+
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.CAMERA"/>
+
+
+    <application
+            android:allowBackup="true"
+            android:icon="@mipmap/ic_launcher"
+            android:label="@string/app_name"
+            android:roundIcon="@mipmap/ic_launcher_round"
+            android:supportsRtl="true"
+            android:theme="@style/AppTheme">
+        <activity android:name="com.baidu.paddle.lite.demo.ocr.MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <activity
+                android:name="com.baidu.paddle.lite.demo.ocr.SettingsActivity"
+                android:label="Settings">
+        </activity>
+    </application>
+
+</manifest>
\ No newline at end of file

deploy/android_demo/app/src/main/cpp/CMakeLists.txt

+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html
+
+# Sets the minimum version of CMake required to build the native library.
+
+cmake_minimum_required(VERSION 3.4.1)
+
+# Creates and names a library, sets it as either STATIC or SHARED, and provides
+# the relative paths to its source code. You can define multiple libraries, and
+# CMake builds them for you. Gradle automatically packages shared libraries with
+# your APK.
+
+set(PaddleLite_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../../../PaddleLite")
+include_directories(${PaddleLite_DIR}/cxx/include)
+
+set(OpenCV_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../../../OpenCV/sdk/native/jni")
+message(STATUS "opencv dir: ${OpenCV_DIR}")
+find_package(OpenCV REQUIRED)
+message(STATUS "OpenCV libraries: ${OpenCV_LIBS}")
+include_directories(${OpenCV_INCLUDE_DIRS})
+aux_source_directory(. SOURCES)
+set(CMAKE_CXX_FLAGS
+        "${CMAKE_CXX_FLAGS} -ffast-math -Ofast -Os"
+        )
+set(CMAKE_CXX_FLAGS
+        "${CMAKE_CXX_FLAGS} -fvisibility=hidden -fvisibility-inlines-hidden -fdata-sections -ffunction-sections"
+        )
+set(CMAKE_SHARED_LINKER_FLAGS
+        "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--gc-sections -Wl,-z,nocopyreloc")
+
+add_library(
+        # Sets the name of the library.
+        Native
+        # Sets the library as a shared library.
+        SHARED
+        # Provides a relative path to your source file(s).
+        ${SOURCES})
+
+find_library(
+        # Sets the name of the path variable.
+        log-lib
+        # Specifies the name of the NDK library that you want CMake to locate.
+        log)
+
+add_library(
+        # Sets the name of the library.
+        paddle_light_api_shared
+        # Sets the library as a shared library.
+        SHARED
+        # Provides a relative path to your source file(s).
+        IMPORTED)
+
+set_target_properties(
+        # Specifies the target library.
+        paddle_light_api_shared
+        # Specifies the parameter you want to define.
+        PROPERTIES
+        IMPORTED_LOCATION
+        ${PaddleLite_DIR}/cxx/libs/${ANDROID_ABI}/libpaddle_light_api_shared.so
+        # Provides the path to the library you want to import.
+)
+
+
+# Specifies libraries CMake should link to your target library. You can link
+# multiple libraries, such as libraries you define in this build script,
+# prebuilt third-party libraries, or system libraries.
+
+target_link_libraries(
+        # Specifies the target library.
+        Native
+        paddle_light_api_shared
+        ${OpenCV_LIBS}
+        GLESv2
+        EGL
+        jnigraphics
+        ${log-lib}
+)
+
+add_custom_command(
+        TARGET Native
+        POST_BUILD
+        COMMAND
+        ${CMAKE_COMMAND} -E copy
+        ${PaddleLite_DIR}/cxx/libs/${ANDROID_ABI}/libc++_shared.so
+        ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libc++_shared.so)
+
+add_custom_command(
+        TARGET Native
+        POST_BUILD
+        COMMAND
+        ${CMAKE_COMMAND} -E copy
+        ${PaddleLite_DIR}/cxx/libs/${ANDROID_ABI}/libpaddle_light_api_shared.so
+        ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libpaddle_light_api_shared.so)
+
+add_custom_command(
+        TARGET Native
+        POST_BUILD
+        COMMAND
+        ${CMAKE_COMMAND} -E copy
+        ${PaddleLite_DIR}/cxx/libs/${ANDROID_ABI}/libhiai.so
+        ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libhiai.so)
+
+add_custom_command(
+        TARGET Native
+        POST_BUILD
+        COMMAND
+        ${CMAKE_COMMAND} -E copy
+        ${PaddleLite_DIR}/cxx/libs/${ANDROID_ABI}/libhiai_ir.so
+        ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libhiai_ir.so)
+
+add_custom_command(
+        TARGET Native
+        POST_BUILD
+        COMMAND
+        ${CMAKE_COMMAND} -E copy
+        ${PaddleLite_DIR}/cxx/libs/${ANDROID_ABI}/libhiai_ir_build.so
+        ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libhiai_ir_build.so)
\ No newline at end of file

deploy/android_demo/app/src/main/cpp/common.h

+//
+// Created by fu on 4/25/18.
+//
+
+#pragma once
+#import <vector>
+#import <numeric>
+
+#ifdef __ANDROID__
+
+#include <android/log.h>
+
+#define LOG_TAG "OCR_NDK"
+
+#define LOGI(...) \
+  __android_log_print(ANDROID_LOG_INFO,  LOG_TAG,  __VA_ARGS__)
+#define LOGW(...) \
+  __android_log_print(ANDROID_LOG_WARN,  LOG_TAG,  __VA_ARGS__)
+#define LOGE(...) \
+  __android_log_print(ANDROID_LOG_ERROR,  LOG_TAG,  __VA_ARGS__)
+#else
+#include <stdio.h>
+#define LOGI(format, ...) \
+  fprintf(stdout, "[" LOG_TAG "]" format "\n", ##__VA_ARGS__)
+#define LOGW(format, ...) \
+  fprintf(stdout, "[" LOG_TAG "]" format "\n", ##__VA_ARGS__)
+#define LOGE(format, ...) \
+  fprintf(stderr, "[" LOG_TAG "]Error: " format "\n", ##__VA_ARGS__)
+#endif
+
+enum RETURN_CODE {
+    RETURN_OK = 0
+};
+
+enum NET_TYPE{
+    NET_OCR = 900100,
+    NET_OCR_INTERNAL = 991008
+};
+
+
+template <typename  T>
+inline T product(const std::vector<T> &vec) {
+    if (vec.empty()){
+        return 0;
+    }
+    return std::accumulate(vec.begin(), vec.end(), 1, std::multiplies<T>());
+}
+

deploy/android_demo/app/src/main/cpp/native.cpp

+//
+// Created by fujiayi on 2020/7/5.
+//
+
+#include "native.h"
+#include "ocr_ppredictor.h"
+#include <string>
+#include <algorithm>
+#include <paddle_api.h>
+
+static paddle::lite_api::PowerMode str_to_cpu_mode(const std::string &cpu_mode);
+
+extern "C"
+JNIEXPORT jlong JNICALL
+Java_com_baidu_paddle_lite_demo_ocr_OCRPredictorNative_init(JNIEnv *env, jobject thiz,
+                                                            jstring j_det_model_path,
+                                                            jstring j_rec_model_path,
+                                                            jint j_thread_num,
+                                                            jstring j_cpu_mode) {
+    std::string det_model_path = jstring_to_cpp_string(env, j_det_model_path);
+    std::string rec_model_path = jstring_to_cpp_string(env, j_rec_model_path);
+    int thread_num = j_thread_num;
+    std::string cpu_mode = jstring_to_cpp_string(env, j_cpu_mode);
+    ppredictor::OCR_Config conf;
+    conf.thread_num = thread_num;
+    conf.mode = str_to_cpu_mode(cpu_mode);
+    ppredictor::OCR_PPredictor *orc_predictor = new ppredictor::OCR_PPredictor{conf};
+    orc_predictor->init_from_file(det_model_path, rec_model_path);
+    return reinterpret_cast<jlong>(orc_predictor);
+}
+
+/**
+ * "LITE_POWER_HIGH" 转为 paddle::lite_api::LITE_POWER_HIGH
+ * @param cpu_mode
+ * @return
+ */
+static paddle::lite_api::PowerMode str_to_cpu_mode(const std::string &cpu_mode) {
+    static std::map<std::string, paddle::lite_api::PowerMode> cpu_mode_map{
+        {"LITE_POWER_HIGH",      paddle::lite_api::LITE_POWER_HIGH},
+        {"LITE_POWER_LOW",       paddle::lite_api::LITE_POWER_HIGH},
+        {"LITE_POWER_FULL",      paddle::lite_api::LITE_POWER_FULL},
+        {"LITE_POWER_NO_BIND",   paddle::lite_api::LITE_POWER_NO_BIND},
+        {"LITE_POWER_RAND_HIGH", paddle::lite_api::LITE_POWER_RAND_HIGH},
+        {"LITE_POWER_RAND_LOW",  paddle::lite_api::LITE_POWER_RAND_LOW}
+    };
+    std::string upper_key;
+    std::transform(cpu_mode.cbegin(), cpu_mode.cend(), upper_key.begin(), ::toupper);
+    auto index = cpu_mode_map.find(upper_key);
+    if (index == cpu_mode_map.end()) {
+        LOGE("cpu_mode not found %s", upper_key.c_str());
+        return paddle::lite_api::LITE_POWER_HIGH;
+    } else {
+        return index->second;
+    }
+
+}
+
+extern "C"
+JNIEXPORT jfloatArray JNICALL
+Java_com_baidu_paddle_lite_demo_ocr_OCRPredictorNative_forward(JNIEnv *env, jobject thiz,
+                                                               jlong java_pointer, jfloatArray buf,
+                                                               jfloatArray ddims,
+                                                               jobject original_image) {
+    LOGI("begin to run native forward");
+    if (java_pointer == 0) {
+        LOGE("JAVA pointer is NULL");
+        return cpp_array_to_jfloatarray(env, nullptr, 0);
+    }
+    cv::Mat origin = bitmap_to_cv_mat(env, original_image);
+    if (origin.size == 0) {
+        LOGE("origin bitmap cannot convert to CV Mat");
+        return cpp_array_to_jfloatarray(env, nullptr, 0);
+    }
+    ppredictor::OCR_PPredictor *ppredictor = (ppredictor::OCR_PPredictor *) java_pointer;
+    std::vector<float> dims_float_arr = jfloatarray_to_float_vector(env, ddims);
+    std::vector<int64_t> dims_arr;
+    dims_arr.resize(dims_float_arr.size());
+    std::copy(dims_float_arr.cbegin(), dims_float_arr.cend(), dims_arr.begin());
+
+    // 这里值有点大，就不调用jfloatarray_to_float_vector了
+    int64_t buf_len = (int64_t) env->GetArrayLength(buf);
+    jfloat *buf_data = env->GetFloatArrayElements(buf, JNI_FALSE);
+    float *data = (jfloat *) buf_data;
+    std::vector<ppredictor::OCRPredictResult> results = ppredictor->infer_ocr(dims_arr, data,
+                                                                              buf_len,
+                                                                              NET_OCR, origin);
+    LOGI("infer_ocr finished with boxes %ld", results.size());
+    // 这里将std::vector<ppredictor::OCRPredictResult> 序列化成 float数组，传输到java层再反序列化
+    std::vector<float> float_arr;
+    for (const ppredictor::OCRPredictResult &r :results) {
+        float_arr.push_back(r.points.size());
+        float_arr.push_back(r.word_index.size());
+        float_arr.push_back(r.score);
+        for (const std::vector<int> &point : r.points) {
+            float_arr.push_back(point.at(0));
+            float_arr.push_back(point.at(1));
+        }
+        for (int index: r.word_index) {
+            float_arr.push_back(index);
+        }
+    }
+    return cpp_array_to_jfloatarray(env, float_arr.data(), float_arr.size());
+}
+
+extern "C"
+JNIEXPORT void JNICALL
+Java_com_baidu_paddle_lite_demo_ocr_OCRPredictorNative_release(JNIEnv *env, jobject thiz,
+                                                               jlong java_pointer){
+    if (java_pointer == 0) {
+        LOGE("JAVA pointer is NULL");
+        return;
+    }
+    ppredictor::OCR_PPredictor *ppredictor = (ppredictor::OCR_PPredictor *) java_pointer;
+    delete ppredictor;
+}
\ No newline at end of file

deploy/android_demo/app/src/main/cpp/native.h

+//
+// Created by fujiayi on 2020/7/5.
+//
+
+#pragma once
+
+
+#include <jni.h>
+#include <string>
+#include <vector>
+#include <android/bitmap.h>
+#include <opencv2/opencv.hpp>
+#include "common.h"
+
+inline std::string jstring_to_cpp_string(JNIEnv *env, jstring jstr) {
+    // In java, a unicode char will be encoded using 2 bytes (utf16).
+    // so jstring will contain characters utf16. std::string in c++ is
+    // essentially a string of bytes, not characters, so if we want to
+    // pass jstring from JNI to c++, we have convert utf16 to bytes.
+    if (!jstr) {
+        return "";
+    }
+    const jclass stringClass = env->GetObjectClass(jstr);
+    const jmethodID getBytes =
+        env->GetMethodID(stringClass, "getBytes", "(Ljava/lang/String;)[B");
+    const jbyteArray stringJbytes = (jbyteArray) env->CallObjectMethod(
+        jstr, getBytes, env->NewStringUTF("UTF-8"));
+
+    size_t length = (size_t) env->GetArrayLength(stringJbytes);
+    jbyte *pBytes = env->GetByteArrayElements(stringJbytes, NULL);
+
+    std::string ret = std::string(reinterpret_cast<char *>(pBytes), length);
+    env->ReleaseByteArrayElements(stringJbytes, pBytes, JNI_ABORT);
+
+    env->DeleteLocalRef(stringJbytes);
+    env->DeleteLocalRef(stringClass);
+    return ret;
+}
+
+inline jstring cpp_string_to_jstring(JNIEnv *env, std::string str) {
+    auto *data = str.c_str();
+    jclass strClass = env->FindClass("java/lang/String");
+    jmethodID strClassInitMethodID =
+        env->GetMethodID(strClass, "<init>", "([BLjava/lang/String;)V");
+
+    jbyteArray bytes = env->NewByteArray(strlen(data));
+    env->SetByteArrayRegion(bytes, 0, strlen(data),
+                            reinterpret_cast<const jbyte *>(data));
+
+    jstring encoding = env->NewStringUTF("UTF-8");
+    jstring res = (jstring) (
+        env->NewObject(strClass, strClassInitMethodID, bytes, encoding));
+
+    env->DeleteLocalRef(strClass);
+    env->DeleteLocalRef(encoding);
+    env->DeleteLocalRef(bytes);
+
+    return res;
+}
+
+inline jfloatArray cpp_array_to_jfloatarray(JNIEnv *env, const float *buf,
+                                            int64_t len) {
+    if (len == 0) {
+        return env->NewFloatArray(0);
+    }
+    jfloatArray result = env->NewFloatArray(len);
+    env->SetFloatArrayRegion(result, 0, len, buf);
+    return result;
+}
+
+inline jintArray cpp_array_to_jintarray(JNIEnv *env, const int *buf,
+                                        int64_t len) {
+    jintArray result = env->NewIntArray(len);
+    env->SetIntArrayRegion(result, 0, len, buf);
+    return result;
+}
+
+inline jbyteArray cpp_array_to_jbytearray(JNIEnv *env, const int8_t *buf,
+                                          int64_t len) {
+    jbyteArray result = env->NewByteArray(len);
+    env->SetByteArrayRegion(result, 0, len, buf);
+    return result;
+}
+
+inline jlongArray int64_vector_to_jlongarray(JNIEnv *env,
+                                             const std::vector<int64_t> &vec) {
+    jlongArray result = env->NewLongArray(vec.size());
+    jlong *buf = new jlong[vec.size()];
+    for (size_t i = 0; i < vec.size(); ++i) {
+        buf[i] = (jlong) vec[i];
+    }
+    env->SetLongArrayRegion(result, 0, vec.size(), buf);
+    delete[] buf;
+    return result;
+}
+
+inline std::vector<int64_t> jlongarray_to_int64_vector(JNIEnv *env,
+                                                       jlongArray data) {
+    int data_size = env->GetArrayLength(data);
+    jlong *data_ptr = env->GetLongArrayElements(data, nullptr);
+    std::vector<int64_t> data_vec(data_ptr, data_ptr + data_size);
+    env->ReleaseLongArrayElements(data, data_ptr, 0);
+    return data_vec;
+}
+
+inline std::vector<float> jfloatarray_to_float_vector(JNIEnv *env,
+                                                      jfloatArray data) {
+    int data_size = env->GetArrayLength(data);
+    jfloat *data_ptr = env->GetFloatArrayElements(data, nullptr);
+    std::vector<float> data_vec(data_ptr, data_ptr + data_size);
+    env->ReleaseFloatArrayElements(data, data_ptr, 0);
+    return data_vec;
+}
+
+inline cv::Mat bitmap_to_cv_mat(JNIEnv *env, jobject bitmap) {
+    AndroidBitmapInfo info;
+    int result = AndroidBitmap_getInfo(env, bitmap, &info);
+    if (result != ANDROID_BITMAP_RESULT_SUCCESS) {
+        LOGE("AndroidBitmap_getInfo failed, result: %d", result);
+        return cv::Mat{};
+    }
+    if (info.format != ANDROID_BITMAP_FORMAT_RGBA_8888) {
+        LOGE("Bitmap format is not RGBA_8888 !");
+        return cv::Mat{};
+    }
+    unsigned char *srcData = NULL;
+    AndroidBitmap_lockPixels(env, bitmap, (void **) &srcData);
+    cv::Mat mat = cv::Mat::zeros(info.height, info.width, CV_8UC4);
+    memcpy(mat.data, srcData, info.height * info.width * 4);
+    AndroidBitmap_unlockPixels(env, bitmap);
+    cv::cvtColor(mat, mat, cv::COLOR_RGBA2BGR);
+    /**
+    if (!cv::imwrite("/sdcard/1/copy.jpg", mat)){
+        LOGE("Write image failed " );
+    }
+     */
+    return mat;
+}

deploy/android_demo/app/src/main/cpp/ocr_clipper.hpp

+/*******************************************************************************
+*                                                                              *
+* Author    :  Angus Johnson                                                   *
+* Version   :  6.4.2                                                           *
+* Date      :  27 February 2017                                                *
+* Website   :  http://www.angusj.com                                           *
+* Copyright :  Angus Johnson 2010-2017                                         *
+*                                                                              *
+* License:                                                                     *
+* Use, modification & distribution is subject to Boost Software License Ver 1. *
+* http://www.boost.org/LICENSE_1_0.txt                                         *
+*                                                                              *
+* Attributions:                                                                *
+* The code in this library is an extension of Bala Vatti's clipping algorithm: *
+* "A generic solution to polygon clipping"                                     *
+* Communications of the ACM, Vol 35, Issue 7 (July 1992) pp 56-63.             *
+* http://portal.acm.org/citation.cfm?id=129906                                 *
+*                                                                              *
+* Computer graphics and geometric modeling: implementation and algorithms      *
+* By Max K. Agoston                                                            *
+* Springer; 1 edition (January 4, 2005)                                        *
+* http://books.google.com/books?q=vatti+clipping+agoston                       *
+*                                                                              *
+* See also:                                                                    *
+* "Polygon Offsetting by Computing Winding Numbers"                            *
+* Paper no. DETC2005-85513 pp. 565-575                                         *
+* ASME 2005 International Design Engineering Technical Conferences             *
+* and Computers and Information in Engineering Conference (IDETC/CIE2005)      *
+* September 24-28, 2005 , Long Beach, California, USA                          *
+* http://www.me.berkeley.edu/~mcmains/pubs/DAC05OffsetPolygon.pdf              *
+*                                                                              *
+*******************************************************************************/
+
+#ifndef clipper_hpp
+#define clipper_hpp
+
+#define CLIPPER_VERSION "6.4.2"
+
+//use_int32: When enabled 32bit ints are used instead of 64bit ints. This
+//improve performance but coordinate values are limited to the range +/- 46340
+//#define use_int32
+
+//use_xyz: adds a Z member to IntPoint. Adds a minor cost to perfomance.
+//#define use_xyz
+
+//use_lines: Enables line clipping. Adds a very minor cost to performance.
+#define use_lines
+
+//use_deprecated: Enables temporary support for the obsolete functions
+//#define use_deprecated
+
+#include <vector>
+#include <list>
+#include <set>
+#include <stdexcept>
+#include <cstring>
+#include <cstdlib>
+#include <ostream>
+#include <functional>
+#include <queue>
+
+namespace ClipperLib {
+
+enum ClipType {
+    ctIntersection, ctUnion, ctDifference, ctXor
+};
+enum PolyType {
+    ptSubject, ptClip
+};
+//By far the most widely used winding rules for polygon filling are
+//EvenOdd & NonZero (GDI, GDI+, XLib, OpenGL, Cairo, AGG, Quartz, SVG, Gr32)
+//Others rules include Positive, Negative and ABS_GTR_EQ_TWO (only in OpenGL)
+//see http://glprogramming.com/red/chapter11.html
+enum PolyFillType {
+    pftEvenOdd, pftNonZero, pftPositive, pftNegative
+};
+
+#ifdef use_int32
+typedef int cInt;
+static cInt const loRange = 0x7FFF;
+static cInt const hiRange = 0x7FFF;
+#else
+typedef signed long long cInt;
+static cInt const loRange = 0x3FFFFFFF;
+static cInt const hiRange = 0x3FFFFFFFFFFFFFFFLL;
+typedef signed long long long64;     //used by Int128 class
+typedef unsigned long long ulong64;
+
+#endif
+
+struct IntPoint {
+    cInt X;
+    cInt Y;
+#ifdef use_xyz
+    cInt Z;
+    IntPoint(cInt x = 0, cInt y = 0, cInt z = 0): X(x), Y(y), Z(z) {};
+#else
+
+    IntPoint(cInt x = 0, cInt y = 0) : X(x), Y(y) {};
+#endif
+
+    friend inline bool operator==(const IntPoint &a, const IntPoint &b) {
+        return a.X == b.X && a.Y == b.Y;
+    }
+
+    friend inline bool operator!=(const IntPoint &a, const IntPoint &b) {
+        return a.X != b.X || a.Y != b.Y;
+    }
+};
+//------------------------------------------------------------------------------
+
+typedef std::vector <IntPoint> Path;
+typedef std::vector <Path> Paths;
+
+inline Path &operator<<(Path &poly, const IntPoint &p) {
+    poly.push_back(p);
+    return poly;
+}
+
+inline Paths &operator<<(Paths &polys, const Path &p) {
+    polys.push_back(p);
+    return polys;
+}
+
+std::ostream &operator<<(std::ostream &s, const IntPoint &p);
+
+std::ostream &operator<<(std::ostream &s, const Path &p);
+
+std::ostream &operator<<(std::ostream &s, const Paths &p);
+
+struct DoublePoint {
+    double X;
+    double Y;
+
+    DoublePoint(double x = 0, double y = 0) : X(x), Y(y) {}
+
+    DoublePoint(IntPoint ip) : X((double) ip.X), Y((double) ip.Y) {}
+};
+//------------------------------------------------------------------------------
+
+#ifdef use_xyz
+typedef void (*ZFillCallback)(IntPoint& e1bot, IntPoint& e1top, IntPoint& e2bot, IntPoint& e2top, IntPoint& pt);
+#endif
+
+enum InitOptions {
+    ioReverseSolution = 1, ioStrictlySimple = 2, ioPreserveCollinear = 4
+};
+enum JoinType {
+    jtSquare, jtRound, jtMiter
+};
+enum EndType {
+    etClosedPolygon, etClosedLine, etOpenButt, etOpenSquare, etOpenRound
+};
+
+class PolyNode;
+
+typedef std::vector<PolyNode *> PolyNodes;
+
+class PolyNode {
+public:
+    PolyNode();
+
+    virtual ~PolyNode() {};
+    Path Contour;
+    PolyNodes Childs;
+    PolyNode *Parent;
+
+    PolyNode *GetNext() const;
+
+    bool IsHole() const;
+
+    bool IsOpen() const;
+
+    int ChildCount() const;
+
+private:
+    //PolyNode& operator =(PolyNode& other);
+    unsigned Index; //node index in Parent.Childs
+    bool m_IsOpen;
+    JoinType m_jointype;
+    EndType m_endtype;
+
+    PolyNode *GetNextSiblingUp() const;
+
+    void AddChild(PolyNode &child);
+
+    friend class Clipper; //to access Index
+    friend class ClipperOffset;
+};
+
+class PolyTree : public PolyNode {
+public:
+    ~PolyTree() { Clear(); };
+
+    PolyNode *GetFirst() const;
+
+    void Clear();
+
+    int Total() const;
+
+private:
+    //PolyTree& operator =(PolyTree& other);
+    PolyNodes AllNodes;
+
+    friend class Clipper; //to access AllNodes
+};
+
+bool Orientation(const Path &poly);
+
+double Area(const Path &poly);
+
+int PointInPolygon(const IntPoint &pt, const Path &path);
+
+void SimplifyPolygon(const Path &in_poly, Paths &out_polys, PolyFillType fillType = pftEvenOdd);
+
+void SimplifyPolygons(const Paths &in_polys, Paths &out_polys, PolyFillType fillType = pftEvenOdd);
+
+void SimplifyPolygons(Paths &polys, PolyFillType fillType = pftEvenOdd);
+
+void CleanPolygon(const Path &in_poly, Path &out_poly, double distance = 1.415);
+
+void CleanPolygon(Path &poly, double distance = 1.415);
+
+void CleanPolygons(const Paths &in_polys, Paths &out_polys, double distance = 1.415);
+
+void CleanPolygons(Paths &polys, double distance = 1.415);
+
+void MinkowskiSum(const Path &pattern, const Path &path, Paths &solution, bool pathIsClosed);
+
+void MinkowskiSum(const Path &pattern, const Paths &paths, Paths &solution, bool pathIsClosed);
+
+void MinkowskiDiff(const Path &poly1, const Path &poly2, Paths &solution);
+
+void PolyTreeToPaths(const PolyTree &polytree, Paths &paths);
+
+void ClosedPathsFromPolyTree(const PolyTree &polytree, Paths &paths);
+
+void OpenPathsFromPolyTree(PolyTree &polytree, Paths &paths);
+
+void ReversePath(Path &p);
+
+void ReversePaths(Paths &p);
+
+struct IntRect {
+    cInt left;
+    cInt top;
+    cInt right;
+    cInt bottom;
+};
+
+//enums that are used internally ...
+enum EdgeSide {
+    esLeft = 1, esRight = 2
+};
+
+//forward declarations (for stuff used internally) ...
+struct TEdge;
+struct IntersectNode;
+struct LocalMinimum;
+struct OutPt;
+struct OutRec;
+struct Join;
+
+typedef std::vector<OutRec *> PolyOutList;
+typedef std::vector<TEdge *> EdgeList;
+typedef std::vector<Join *> JoinList;
+typedef std::vector<IntersectNode *> IntersectList;
+
+//------------------------------------------------------------------------------
+
+//ClipperBase is the ancestor to the Clipper class. It should not be
+//instantiated directly. This class simply abstracts the conversion of sets of
+//polygon coordinates into edge objects that are stored in a LocalMinima list.
+class ClipperBase {
+public:
+    ClipperBase();
+
+    virtual ~ClipperBase();
+
+    virtual bool AddPath(const Path &pg, PolyType PolyTyp, bool Closed);
+
+    bool AddPaths(const Paths &ppg, PolyType PolyTyp, bool Closed);
+
+    virtual void Clear();
+
+    IntRect GetBounds();
+
+    bool PreserveCollinear() { return m_PreserveCollinear; };
+
+    void PreserveCollinear(bool value) { m_PreserveCollinear = value; };
+protected:
+    void DisposeLocalMinimaList();
+
+    TEdge *AddBoundsToLML(TEdge *e, bool IsClosed);
+
+    virtual void Reset();
+
+    TEdge *ProcessBound(TEdge *E, bool IsClockwise);
+
+    void InsertScanbeam(const cInt Y);
+
+    bool PopScanbeam(cInt &Y);
+
+    bool LocalMinimaPending();
+
+    bool PopLocalMinima(cInt Y, const LocalMinimum *&locMin);
+
+    OutRec *CreateOutRec();
+
+    void DisposeAllOutRecs();
+
+    void DisposeOutRec(PolyOutList::size_type index);
+
+    void SwapPositionsInAEL(TEdge *edge1, TEdge *edge2);
+
+    void DeleteFromAEL(TEdge *e);
+
+    void UpdateEdgeIntoAEL(TEdge *&e);
+
+    typedef std::vector <LocalMinimum> MinimaList;
+    MinimaList::iterator m_CurrentLM;
+    MinimaList m_MinimaList;
+
+    bool m_UseFullRange;
+    EdgeList m_edges;
+    bool m_PreserveCollinear;
+    bool m_HasOpenPaths;
+    PolyOutList m_PolyOuts;
+    TEdge *m_ActiveEdges;
+
+    typedef std::priority_queue <cInt> ScanbeamList;
+    ScanbeamList m_Scanbeam;
+};
+//------------------------------------------------------------------------------
+
+class Clipper : public virtual ClipperBase {
+public:
+    Clipper(int initOptions = 0);
+
+    bool Execute(ClipType clipType,
+                 Paths &solution,
+                 PolyFillType fillType = pftEvenOdd);
+
+    bool Execute(ClipType clipType,
+                 Paths &solution,
+                 PolyFillType subjFillType,
+                 PolyFillType clipFillType);
+
+    bool Execute(ClipType clipType,
+                 PolyTree &polytree,
+                 PolyFillType fillType = pftEvenOdd);
+
+    bool Execute(ClipType clipType,
+                 PolyTree &polytree,
+                 PolyFillType subjFillType,
+                 PolyFillType clipFillType);
+
+    bool ReverseSolution() { return m_ReverseOutput; };
+
+    void ReverseSolution(bool value) { m_ReverseOutput = value; };
+
+    bool StrictlySimple() { return m_StrictSimple; };
+
+    void StrictlySimple(bool value) { m_StrictSimple = value; };
+    //set the callback function for z value filling on intersections (otherwise Z is 0)
+#ifdef use_xyz
+    void ZFillFunction(ZFillCallback zFillFunc);
+#endif
+protected:
+    virtual bool ExecuteInternal();
+
+private:
+    JoinList m_Joins;
+    JoinList m_GhostJoins;
+    IntersectList m_IntersectList;
+    ClipType m_ClipType;
+    typedef std::list <cInt> MaximaList;
+    MaximaList m_Maxima;
+    TEdge *m_SortedEdges;
+    bool m_ExecuteLocked;
+    PolyFillType m_ClipFillType;
+    PolyFillType m_SubjFillType;
+    bool m_ReverseOutput;
+    bool m_UsingPolyTree;
+    bool m_StrictSimple;
+#ifdef use_xyz
+    ZFillCallback   m_ZFill; //custom callback
+#endif
+
+    void SetWindingCount(TEdge &edge);
+
+    bool IsEvenOddFillType(const TEdge &edge) const;
+
+    bool IsEvenOddAltFillType(const TEdge &edge) const;
+
+    void InsertLocalMinimaIntoAEL(const cInt botY);
+
+    void InsertEdgeIntoAEL(TEdge *edge, TEdge *startEdge);
+
+    void AddEdgeToSEL(TEdge *edge);
+
+    bool PopEdgeFromSEL(TEdge *&edge);
+
+    void CopyAELToSEL();
+
+    void DeleteFromSEL(TEdge *e);
+
+    void SwapPositionsInSEL(TEdge *edge1, TEdge *edge2);
+
+    bool IsContributing(const TEdge &edge) const;
+
+    bool IsTopHorz(const cInt XPos);
+
+    void DoMaxima(TEdge *e);
+
+    void ProcessHorizontals();
+
+    void ProcessHorizontal(TEdge *horzEdge);
+
+    void AddLocalMaxPoly(TEdge *e1, TEdge *e2, const IntPoint &pt);
+
+    OutPt *AddLocalMinPoly(TEdge *e1, TEdge *e2, const IntPoint &pt);
+
+    OutRec *GetOutRec(int idx);
+
+    void AppendPolygon(TEdge *e1, TEdge *e2);
+
+    void IntersectEdges(TEdge *e1, TEdge *e2, IntPoint &pt);
+
+    OutPt *AddOutPt(TEdge *e, const IntPoint &pt);
+
+    OutPt *GetLastOutPt(TEdge *e);
+
+    bool ProcessIntersections(const cInt topY);
+
+    void BuildIntersectList(const cInt topY);
+
+    void ProcessIntersectList();
+
+    void ProcessEdgesAtTopOfScanbeam(const cInt topY);
+
+    void BuildResult(Paths &polys);
+
+    void BuildResult2(PolyTree &polytree);
+
+    void SetHoleState(TEdge *e, OutRec *outrec);
+
+    void DisposeIntersectNodes();
+
+    bool FixupIntersectionOrder();
+
+    void FixupOutPolygon(OutRec &outrec);
+
+    void FixupOutPolyline(OutRec &outrec);
+
+    bool IsHole(TEdge *e);
+
+    bool FindOwnerFromSplitRecs(OutRec &outRec, OutRec *&currOrfl);
+
+    void FixHoleLinkage(OutRec &outrec);
+
+    void AddJoin(OutPt *op1, OutPt *op2, const IntPoint offPt);
+
+    void ClearJoins();
+
+    void ClearGhostJoins();
+
+    void AddGhostJoin(OutPt *op, const IntPoint offPt);
+
+    bool JoinPoints(Join *j, OutRec *outRec1, OutRec *outRec2);
+
+    void JoinCommonEdges();
+
+    void DoSimplePolygons();
+
+    void FixupFirstLefts1(OutRec *OldOutRec, OutRec *NewOutRec);
+
+    void FixupFirstLefts2(OutRec *InnerOutRec, OutRec *OuterOutRec);
+
+    void FixupFirstLefts3(OutRec *OldOutRec, OutRec *NewOutRec);
+
+#ifdef use_xyz
+    void SetZ(IntPoint& pt, TEdge& e1, TEdge& e2);
+#endif
+};
+//------------------------------------------------------------------------------
+
+class ClipperOffset {
+public:
+    ClipperOffset(double miterLimit = 2.0, double roundPrecision = 0.25);
+
+    ~ClipperOffset();
+
+    void AddPath(const Path &path, JoinType joinType, EndType endType);
+
+    void AddPaths(const Paths &paths, JoinType joinType, EndType endType);
+
+    void Execute(Paths &solution, double delta);
+
+    void Execute(PolyTree &solution, double delta);
+
+    void Clear();
+
+    double MiterLimit;
+    double ArcTolerance;
+private:
+    Paths m_destPolys;
+    Path m_srcPoly;
+    Path m_destPoly;
+    std::vector <DoublePoint> m_normals;
+    double m_delta, m_sinA, m_sin, m_cos;
+    double m_miterLim, m_StepsPerRad;
+    IntPoint m_lowest;
+    PolyNode m_polyNodes;
+
+    void FixOrientations();
+
+    void DoOffset(double delta);
+
+    void OffsetPoint(int j, int &k, JoinType jointype);
+
+    void DoSquare(int j, int k);
+
+    void DoMiter(int j, int k, double r);
+
+    void DoRound(int j, int k);
+};
+//------------------------------------------------------------------------------
+
+class clipperException : public std::exception {
+public:
+    clipperException(const char *description) : m_descr(description) {}
+
+    virtual ~clipperException() throw() {}
+
+    virtual const char *what() const throw() { return m_descr.c_str(); }
+
+private:
+    std::string m_descr;
+};
+//------------------------------------------------------------------------------
+
+} //ClipperLib namespace
+
+#endif //clipper_hpp
+
+

deploy/android_demo/app/src/main/cpp/ocr_crnn_process.cpp

+// Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "ocr_crnn_process.h"
+#include <iostream>
+#include <vector>
+#include <iostream>
+#include <cstring>
+#include <fstream>
+#include <cmath>
+
+const std::string CHARACTER_TYPE = "ch";
+const int MAX_DICT_LENGTH = 6624;
+const std::vector<int> REC_IMAGE_SHAPE = {3, 32, 320};
+
+static cv::Mat crnn_resize_norm_img(cv::Mat img, float wh_ratio) {
+    int imgC = REC_IMAGE_SHAPE[0];
+    int imgW = REC_IMAGE_SHAPE[2];
+    int imgH = REC_IMAGE_SHAPE[1];
+
+    if (CHARACTER_TYPE == "ch")
+        imgW = int(32 * wh_ratio);
+
+    float ratio = float(img.cols) / float(img.rows);
+    int resize_w = 0;
+    if (ceilf(imgH * ratio) > imgW)
+        resize_w = imgW;
+    else
+        resize_w = int(ceilf(imgH * ratio));
+    cv::Mat resize_img;
+    cv::resize(img, resize_img, cv::Size(resize_w, imgH), 0.f, 0.f, cv::INTER_CUBIC);
+
+    resize_img.convertTo(resize_img, CV_32FC3, 1 / 255.f);
+
+    for (int h = 0; h < resize_img.rows; h++) {
+        for (int w = 0; w < resize_img.cols; w++) {
+            resize_img.at<cv::Vec3f>(h, w)[0] = (resize_img.at<cv::Vec3f>(h, w)[0] - 0.5) * 2;
+            resize_img.at<cv::Vec3f>(h, w)[1] = (resize_img.at<cv::Vec3f>(h, w)[1] - 0.5) * 2;
+            resize_img.at<cv::Vec3f>(h, w)[2] = (resize_img.at<cv::Vec3f>(h, w)[2] - 0.5) * 2;
+        }
+    }
+
+    cv::Mat dist;
+    cv::copyMakeBorder(resize_img, dist, 0, 0, 0, int(imgW - resize_w), cv::BORDER_CONSTANT,
+                       {0, 0, 0});
+
+    return dist;
+
+}
+
+cv::Mat crnn_resize_img(const cv::Mat &img, float wh_ratio) {
+    int imgC = REC_IMAGE_SHAPE[0];
+    int imgW = REC_IMAGE_SHAPE[2];
+    int imgH = REC_IMAGE_SHAPE[1];
+
+    if (CHARACTER_TYPE == "ch") {
+        imgW = int(32 * wh_ratio);
+    }
+
+    float ratio = float(img.cols) / float(img.rows);
+    int resize_w = 0;
+    if (ceilf(imgH * ratio) > imgW)
+        resize_w = imgW;
+    else
+        resize_w = int(ceilf(imgH * ratio));
+    cv::Mat resize_img;
+    cv::resize(img, resize_img, cv::Size(resize_w, imgH));
+    return resize_img;
+}
+
+
+cv::Mat get_rotate_crop_image(const cv::Mat &srcimage, const std::vector<std::vector<int>> &box) {
+
+    std::vector<std::vector<int>> points = box;
+
+    int x_collect[4] = {box[0][0], box[1][0], box[2][0], box[3][0]};
+    int y_collect[4] = {box[0][1], box[1][1], box[2][1], box[3][1]};
+    int left = int(*std::min_element(x_collect, x_collect + 4));
+    int right = int(*std::max_element(x_collect, x_collect + 4));
+    int top = int(*std::min_element(y_collect, y_collect + 4));
+    int bottom = int(*std::max_element(y_collect, y_collect + 4));
+
+    cv::Mat img_crop;
+    srcimage(cv::Rect(left, top, right - left, bottom - top)).copyTo(img_crop);
+
+    for (int i = 0; i < points.size(); i++) {
+        points[i][0] -= left;
+        points[i][1] -= top;
+    }
+
+    int img_crop_width = int(sqrt(pow(points[0][0] - points[1][0], 2) +
+                                  pow(points[0][1] - points[1][1], 2)));
+    int img_crop_height = int(sqrt(pow(points[0][0] - points[3][0], 2) +
+                                   pow(points[0][1] - points[3][1], 2)));
+
+    cv::Point2f pts_std[4];
+    pts_std[0] = cv::Point2f(0., 0.);
+    pts_std[1] = cv::Point2f(img_crop_width, 0.);
+    pts_std[2] = cv::Point2f(img_crop_width, img_crop_height);
+    pts_std[3] = cv::Point2f(0.f, img_crop_height);
+
+    cv::Point2f pointsf[4];
+    pointsf[0] = cv::Point2f(points[0][0], points[0][1]);
+    pointsf[1] = cv::Point2f(points[1][0], points[1][1]);
+    pointsf[2] = cv::Point2f(points[2][0], points[2][1]);
+    pointsf[3] = cv::Point2f(points[3][0], points[3][1]);
+
+    cv::Mat M = cv::getPerspectiveTransform(pointsf, pts_std);
+
+    cv::Mat dst_img;
+    cv::warpPerspective(img_crop, dst_img, M, cv::Size(img_crop_width, img_crop_height),
+                        cv::BORDER_REPLICATE);
+
+    if (float(dst_img.rows) >= float(dst_img.cols) * 1.5) {
+        /*
+        cv::Mat srcCopy = cv::Mat(dst_img.rows, dst_img.cols, dst_img.depth());
+        cv::transpose(dst_img, srcCopy);
+        cv::flip(srcCopy, srcCopy, 0);
+        return srcCopy;
+        */
+        cv::transpose(dst_img, dst_img);
+        cv::flip(dst_img, dst_img, 0);
+        return dst_img;
+    } else {
+        return dst_img;
+    }
+
+}
+

deploy/android_demo/app/src/main/cpp/ocr_crnn_process.h

+//
+// Created by fujiayi on 2020/7/3.
+//
+#pragma once
+
+#include <vector>
+#include <opencv2/opencv.hpp>
+#include "common.h"
+
+extern const std::vector<int> REC_IMAGE_SHAPE;
+
+cv::Mat get_rotate_crop_image(const cv::Mat &srcimage, const std::vector<std::vector<int>> &box);
+
+cv::Mat crnn_resize_img(const cv::Mat &img, float wh_ratio);
+
+template<class ForwardIterator>
+inline size_t argmax(ForwardIterator first, ForwardIterator last) {
+    return std::distance(first, std::max_element(first, last));
+}
\ No newline at end of file

deploy/android_demo/app/src/main/cpp/ocr_db_post_process.cpp

+// Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <iostream>
+#include <vector>
+#include <math.h>
+#include "opencv2/core.hpp"
+#include "opencv2/imgcodecs.hpp"
+#include "opencv2/imgproc.hpp"
+#include "ocr_clipper.hpp"
+
+static void getcontourarea(float **box, float unclip_ratio, float &distance) {
+    int pts_num = 4;
+    float area = 0.0f;
+    float dist = 0.0f;
+    for (int i = 0; i < pts_num; i++) {
+        area += box[i][0] * box[(i + 1) % pts_num][1] - box[i][1] * box[(i + 1) % pts_num][0];
+        dist += sqrtf(
+            (box[i][0] - box[(i + 1) % pts_num][0]) * (box[i][0] - box[(i + 1) % pts_num][0]) +
+            (box[i][1] - box[(i + 1) % pts_num][1]) * (box[i][1] - box[(i + 1) % pts_num][1]));
+    }
+    area = fabs(float(area / 2.0));
+
+    distance = area * unclip_ratio / dist;
+
+}
+
+static cv::RotatedRect unclip(float **box) {
+    float unclip_ratio = 2.0;
+    float distance = 1.0;
+
+    getcontourarea(box, unclip_ratio, distance);
+
+    ClipperLib::ClipperOffset offset;
+    ClipperLib::Path p;
+    p << ClipperLib::IntPoint(int(box[0][0]), int(box[0][1]))
+      << ClipperLib::IntPoint(int(box[1][0]), int(box[1][1])) <<
+      ClipperLib::IntPoint(int(box[2][0]), int(box[2][1]))
+      << ClipperLib::IntPoint(int(box[3][0]), int(box[3][1]));
+    offset.AddPath(p, ClipperLib::jtRound, ClipperLib::etClosedPolygon);
+
+    ClipperLib::Paths soln;
+    offset.Execute(soln, distance);
+    std::vector<cv::Point2f> points;
+
+    for (int j = 0; j < soln.size(); j++) {
+        for (int i = 0; i < soln[soln.size() - 1].size(); i++) {
+            points.emplace_back(soln[j][i].X, soln[j][i].Y);
+        }
+    }
+    cv::RotatedRect res = cv::minAreaRect(points);
+
+    return res;
+}
+
+static float **Mat2Vec(cv::Mat mat) {
+    auto **array = new float *[mat.rows];
+    for (int i = 0; i < mat.rows; ++i){
+        array[i] = new float[mat.cols];
+    }
+    for (int i = 0; i < mat.rows; ++i) {
+        for (int j = 0; j < mat.cols; ++j) {
+            array[i][j] = mat.at<float>(i, j);
+        }
+    }
+
+    return array;
+}
+
+static void quickSort(float **s, int l, int r) {
+    if (l < r) {
+        int i = l, j = r;
+        float x = s[l][0];
+        float *xp = s[l];
+        while (i < j) {
+            while (i < j && s[j][0] >= x){
+                j--;
+            }
+            if (i < j){
+                std::swap(s[i++], s[j]);
+            }
+            while (i < j && s[i][0] < x){
+                i++;
+            }
+            if (i < j){
+                std::swap(s[j--], s[i]);
+            }
+        }
+        s[i] = xp;
+        quickSort(s, l, i - 1);
+        quickSort(s, i + 1, r);
+    }
+}
+
+static void quickSort_vector(std::vector<std::vector<int>> &box, int l, int r, int axis) {
+    if (l < r) {
+        int i = l, j = r;
+        int x = box[l][axis];
+        std::vector<int> xp(box[l]);
+        while (i < j) {
+            while (i < j && box[j][axis] >= x){
+                j--;
+            }
+            if (i < j){
+                std::swap(box[i++], box[j]);
+            }
+            while (i < j && box[i][axis] < x){
+                i++;
+            }
+            if (i < j){
+                std::swap(box[j--], box[i]);
+            }
+        }
+        box[i] = xp;
+        quickSort_vector(box, l, i - 1, axis);
+        quickSort_vector(box, i + 1, r, axis);
+    }
+}
+
+static std::vector<std::vector<int>> order_points_clockwise(std::vector<std::vector<int>> pts) {
+    std::vector<std::vector<int>> box = pts;
+    quickSort_vector(box, 0, int(box.size() - 1), 0);
+    std::vector<std::vector<int>> leftmost = {box[0], box[1]};
+    std::vector<std::vector<int>> rightmost = {box[2], box[3]};
+
+    if (leftmost[0][1] > leftmost[1][1]){
+        std::swap(leftmost[0], leftmost[1]);
+    }
+
+    if (rightmost[0][1] > rightmost[1][1]){
+        std::swap(rightmost[0], rightmost[1]);
+    }
+
+    std::vector<std::vector<int>> rect = {leftmost[0], rightmost[0], rightmost[1], leftmost[1]};
+    return rect;
+}
+
+static float **get_mini_boxes(cv::RotatedRect box, float &ssid) {
+    ssid = box.size.width >= box.size.height ? box.size.height : box.size.width;
+
+    cv::Mat points;
+    cv::boxPoints(box, points);
+    // sorted box points
+    auto array = Mat2Vec(points);
+    quickSort(array, 0, 3);
+
+    float *idx1 = array[0], *idx2 = array[1], *idx3 = array[2], *idx4 = array[3];
+    if (array[3][1] <= array[2][1]) {
+        idx2 = array[3];
+        idx3 = array[2];
+    } else {
+        idx2 = array[2];
+        idx3 = array[3];
+    }
+    if (array[1][1] <= array[0][1]) {
+        idx1 = array[1];
+        idx4 = array[0];
+    } else {
+        idx1 = array[0];
+        idx4 = array[1];
+    }
+
+    array[0] = idx1;
+    array[1] = idx2;
+    array[2] = idx3;
+    array[3] = idx4;
+
+    return array;
+}
+
+template <class T> T clamp(T x,   T min, T   max) {
+    if (x > max){
+        return  max;
+    }
+    if (x < min){
+        return min;
+    }
+    return x;
+}
+
+static float clampf(float x, float min, float max) {
+    if (x > max)
+        return max;
+    if (x < min)
+        return min;
+    return x;
+}
+
+
+float box_score_fast(float **box_array, cv::Mat pred) {
+    auto array = box_array;
+    int width = pred.cols;
+    int height = pred.rows;
+
+    float box_x[4] = {array[0][0], array[1][0], array[2][0], array[3][0]};
+    float box_y[4] = {array[0][1], array[1][1], array[2][1], array[3][1]};
+
+    int xmin = clamp(int(std::floorf(*(std::min_element(box_x, box_x + 4)))), 0, width - 1);
+    int xmax = clamp(int(std::ceilf(*(std::max_element(box_x, box_x + 4)))), 0, width - 1);
+    int ymin = clamp(int(std::floorf(*(std::min_element(box_y, box_y + 4)))), 0, height - 1);
+    int ymax = clamp(int(std::ceilf(*(std::max_element(box_y, box_y + 4)))), 0, height - 1);
+
+    cv::Mat mask;
+    mask = cv::Mat::zeros(ymax - ymin + 1, xmax - xmin + 1, CV_8UC1);
+
+    cv::Point root_point[4];
+    root_point[0] = cv::Point(int(array[0][0]) - xmin, int(array[0][1]) - ymin);
+    root_point[1] = cv::Point(int(array[1][0]) - xmin, int(array[1][1]) - ymin);
+    root_point[2] = cv::Point(int(array[2][0]) - xmin, int(array[2][1]) - ymin);
+    root_point[3] = cv::Point(int(array[3][0]) - xmin, int(array[3][1]) - ymin);
+    const cv::Point *ppt[1] = {root_point};
+    int npt[] = {4};
+    cv::fillPoly(mask, ppt, npt, 1, cv::Scalar(1));
+
+    cv::Mat croppedImg;
+    pred(cv::Rect(xmin, ymin, xmax - xmin + 1, ymax - ymin + 1)).copyTo(croppedImg);
+
+    auto score = cv::mean(croppedImg, mask)[0];
+    return score;
+}
+
+
+std::vector<std::vector<std::vector<int>>>
+boxes_from_bitmap(const cv::Mat& pred, const cv::Mat& bitmap) {
+    const int min_size = 3;
+    const int max_candidates = 1000;
+    const float box_thresh = 0.5;
+
+    int width = bitmap.cols;
+    int height = bitmap.rows;
+
+    std::vector<std::vector<cv::Point>> contours;
+    std::vector<cv::Vec4i> hierarchy;
+
+    cv::findContours(bitmap, contours, hierarchy, cv::RETR_LIST, cv::CHAIN_APPROX_SIMPLE);
+
+    int num_contours = contours.size() >= max_candidates ? max_candidates : contours.size();
+
+    std::vector<std::vector<std::vector<int>>> boxes;
+
+    for (int _i = 0; _i < num_contours; _i++) {
+        float ssid;
+        cv::RotatedRect box = cv::minAreaRect(contours[_i]);
+        auto array = get_mini_boxes(box, ssid);
+
+        auto box_for_unclip = array;
+        //end get_mini_box
+
+        if (ssid < min_size) {
+            continue;
+        }
+
+        float score;
+        score = box_score_fast(array, pred);
+        //end box_score_fast
+        if (score < box_thresh){
+            continue;
+        }
+
+
+        // start for unclip
+        cv::RotatedRect points = unclip(box_for_unclip);
+        // end for unclip
+
+        cv::RotatedRect clipbox = points;
+        auto cliparray = get_mini_boxes(clipbox, ssid);
+
+        if (ssid < min_size + 2) continue;
+
+        int dest_width = pred.cols;
+        int dest_height = pred.rows;
+        std::vector<std::vector<int>> intcliparray;
+
+        for (int num_pt = 0; num_pt < 4; num_pt++) {
+            std::vector<int> a{
+                int(clampf(roundf(cliparray[num_pt][0] / float(width) * float(dest_width)), 0,
+                           float(dest_width))),
+                int(clampf(roundf(cliparray[num_pt][1] / float(height) * float(dest_height)), 0,
+                           float(dest_height)))};
+            intcliparray.emplace_back(std::move(a));
+        }
+        boxes.emplace_back(std::move(intcliparray));
+
+    }//end for
+    return boxes;
+}
+
+int _max(int a, int b) {
+    return a >= b ? a : b;
+}
+
+int _min(int a, int b) {
+    return a >= b ? b : a;
+}
+
+std::vector<std::vector<std::vector<int>>>
+filter_tag_det_res(const std::vector<std::vector<std::vector<int>>>& o_boxes,
+                   float ratio_h, float ratio_w,const cv::Mat& srcimg) {
+    int oriimg_h = srcimg.rows;
+    int oriimg_w = srcimg.cols;
+    std::vector<std::vector<std::vector<int>>> boxes{o_boxes};
+    std::vector<std::vector<std::vector<int>>> root_points;
+    for (int n = 0; n < boxes.size(); n++) {
+        boxes[n] = order_points_clockwise(boxes[n]);
+        for (int m = 0; m < boxes[0].size(); m++) {
+            boxes[n][m][0] /= ratio_w;
+            boxes[n][m][1] /= ratio_h;
+
+            boxes[n][m][0] = int(_min(_max(boxes[n][m][0], 0), oriimg_w - 1));
+            boxes[n][m][1] = int(_min(_max(boxes[n][m][1], 0), oriimg_h - 1));
+        }
+    }
+
+    for (int n = 0; n < boxes.size(); n++) {
+        int rect_width, rect_height;
+        rect_width = int(sqrt(
+            pow(boxes[n][0][0] - boxes[n][1][0], 2) + pow(boxes[n][0][1] - boxes[n][1][1], 2)));
+        rect_height = int(sqrt(
+            pow(boxes[n][0][0] - boxes[n][3][0], 2) + pow(boxes[n][0][1] - boxes[n][3][1], 2)));
+        if (rect_width <= 10 || rect_height <= 10)
+            continue;
+        root_points.push_back(boxes[n]);
+    }
+    return root_points;
+}
\ No newline at end of file

deploy/android_demo/app/src/main/cpp/ocr_db_post_process.h

+//
+// Created by fujiayi on 2020/7/2.
+//
+#pragma once
+#include <vector>
+#include <opencv2/opencv.hpp>
+
+std::vector<std::vector<std::vector<int>>>
+boxes_from_bitmap(const cv::Mat &pred, const cv::Mat &bitmap);
+
+std::vector<std::vector<std::vector<int>>>
+filter_tag_det_res(
+    const std::vector<std::vector<std::vector<int>>> &o_boxes,
+    float ratio_h,
+    float ratio_w,
+    const cv::Mat &srcimg
+);
\ No newline at end of file

deploy/android_demo/app/src/main/cpp/ocr_ppredictor.cpp

+//
+// Created by fujiayi on 2020/7/1.
+//
+
+#include "ocr_ppredictor.h"
+#include "preprocess.h"
+#include "common.h"
+#include "ocr_db_post_process.h"
+#include "ocr_crnn_process.h"
+
+namespace ppredictor {
+
+OCR_PPredictor::OCR_PPredictor(const OCR_Config &config) : _config(config) {
+
+}
+
+int
+OCR_PPredictor::init(const std::string &det_model_content, const std::string &rec_model_content) {
+    _det_predictor = std::unique_ptr<PPredictor>(
+        new PPredictor{_config.thread_num, NET_OCR, _config.mode});
+    _det_predictor->init_nb(det_model_content);
+
+    _rec_predictor = std::unique_ptr<PPredictor>(
+        new PPredictor{_config.thread_num, NET_OCR_INTERNAL, _config.mode});
+    _rec_predictor->init_nb(rec_model_content);
+    return RETURN_OK;
+}
+
+int OCR_PPredictor::init_from_file(const std::string &det_model_path, const std::string &rec_model_path){
+    _det_predictor = std::unique_ptr<PPredictor>(
+        new PPredictor{_config.thread_num, NET_OCR, _config.mode});
+    _det_predictor->init_from_file(det_model_path);
+
+    _rec_predictor = std::unique_ptr<PPredictor>(
+        new PPredictor{_config.thread_num, NET_OCR_INTERNAL, _config.mode});
+    _rec_predictor->init_from_file(rec_model_path);
+    return RETURN_OK;
+}
+/**
+ * 调试用，保存第一步的框选结果
+ * @param filter_boxes
+ * @param boxes
+ * @param srcimg
+ */
+static void visual_img(const std::vector<std::vector<std::vector<int>>> &filter_boxes,
+                       const std::vector<std::vector<std::vector<int>>> &boxes,
+                       const cv::Mat &srcimg) {
+    // visualization
+    cv::Point rook_points[filter_boxes.size()][4];
+    for (int n = 0; n < filter_boxes.size(); n++) {
+        for (int m = 0; m < filter_boxes[0].size(); m++) {
+            rook_points[n][m] = cv::Point(int(filter_boxes[n][m][0]), int(filter_boxes[n][m][1]));
+        }
+    }
+
+    cv::Mat img_vis;
+    srcimg.copyTo(img_vis);
+    for (int n = 0; n < boxes.size(); n++) {
+        const cv::Point *ppt[1] = {rook_points[n]};
+        int npt[] = {4};
+        cv::polylines(img_vis, ppt, npt, 1, 1, CV_RGB(0, 255, 0), 2, 8, 0);
+    }
+    // 调试用，自行替换需要修改的路径
+    cv::imwrite("/sdcard/1/vis.png", img_vis);
+}
+
+std::vector<OCRPredictResult>
+OCR_PPredictor::infer_ocr(const std::vector<int64_t> &dims, const float *input_data, int input_len,
+                          int net_flag, cv::Mat &origin) {
+
+    PredictorInput input = _det_predictor->get_first_input();
+    input.set_dims(dims);
+    input.set_data(input_data, input_len);
+    std::vector<PredictorOutput> results = _det_predictor->infer();
+    PredictorOutput &res = results.at(0);
+    std::vector<std::vector<std::vector<int>>> filtered_box
+        = calc_filtered_boxes(res.get_float_data(), res.get_size(), (int) dims[2], (int) dims[3],
+                              origin);
+    LOGI("Filter_box size %ld", filtered_box.size());
+    return infer_rec(filtered_box, origin);
+}
+
+std::vector<OCRPredictResult>
+OCR_PPredictor::infer_rec(const std::vector<std::vector<std::vector<int>>> &boxes,
+                          const cv::Mat &origin_img) {
+    std::vector<float> mean = {0.5f, 0.5f, 0.5f};
+    std::vector<float> scale = {1 / 0.5f, 1 / 0.5f, 1 / 0.5f};
+    std::vector<int64_t> dims = {1, 3, 0, 0};
+    std::vector<OCRPredictResult> ocr_results;
+
+    PredictorInput input = _rec_predictor->get_first_input();
+    for (auto bp = boxes.crbegin(); bp != boxes.crend(); ++bp) {
+        const std::vector<std::vector<int>> &box = *bp;
+        cv::Mat crop_img = get_rotate_crop_image(origin_img, box);
+        float wh_ratio = float(crop_img.cols) / float(crop_img.rows);
+        cv::Mat input_image = crnn_resize_img(crop_img, wh_ratio);
+        input_image.convertTo(input_image, CV_32FC3, 1 / 255.0f);
+        const float *dimg = reinterpret_cast<const float *>(input_image.data);
+        int input_size = input_image.rows * input_image.cols;
+
+        dims[2] = input_image.rows;
+        dims[3] = input_image.cols;
+        input.set_dims(dims);
+
+        neon_mean_scale(dimg, input.get_mutable_float_data(), input_size, mean, scale);
+
+        std::vector<PredictorOutput> results = _rec_predictor->infer();
+
+        OCRPredictResult res;
+        res.word_index = postprocess_rec_word_index(results.at(0));
+        if (res.word_index.empty()) {
+            continue;
+        }
+        res.score = postprocess_rec_score(results.at(1));
+        res.points = box;
+        ocr_results.emplace_back(std::move(res));
+    }
+    LOGI("ocr_results finished %lu", ocr_results.size());
+    return ocr_results;
+}
+
+std::vector<std::vector<std::vector<int>>>
+OCR_PPredictor::calc_filtered_boxes(const float *pred, int pred_size, int output_height,
+                                    int output_width, const cv::Mat &origin) {
+    const double threshold = 0.3;
+    const double maxvalue = 1;
+
+    cv::Mat pred_map = cv::Mat::zeros(output_height, output_width, CV_32F);
+    memcpy(pred_map.data, pred, pred_size * sizeof(float));
+    cv::Mat cbuf_map;
+    pred_map.convertTo(cbuf_map, CV_8UC1);
+
+    cv::Mat bit_map;
+    cv::threshold(cbuf_map, bit_map, threshold, maxvalue, cv::THRESH_BINARY);
+
+    std::vector<std::vector<std::vector<int>>> boxes = boxes_from_bitmap(pred_map, bit_map);
+    float ratio_h = output_height * 1.0f / origin.rows;
+    float ratio_w = output_width * 1.0f / origin.cols;
+    std::vector<std::vector<std::vector<int>>> filter_boxes = filter_tag_det_res(boxes, ratio_h,
+                                                                                 ratio_w, origin);
+    return filter_boxes;
+}
+
+std::vector<int> OCR_PPredictor::postprocess_rec_word_index(const PredictorOutput &res) {
+    const int *rec_idx = res.get_int_data();
+    const std::vector<std::vector<uint64_t>> rec_idx_lod = res.get_lod();
+
+    std::vector<int> pred_idx;
+    for (int n = int(rec_idx_lod[0][0]); n < int(rec_idx_lod[0][1] * 2); n += 2) {
+        pred_idx.emplace_back(rec_idx[n]);
+    }
+    return pred_idx;
+}
+
+float OCR_PPredictor::postprocess_rec_score(const PredictorOutput &res) {
+    const float *predict_batch = res.get_float_data();
+    const std::vector<int64_t> predict_shape = res.get_shape();
+    const std::vector<std::vector<uint64_t>> predict_lod = res.get_lod();
+    int blank = predict_shape[1];
+    float score = 0.f;
+    int count = 0;
+    for (int n = predict_lod[0][0]; n < predict_lod[0][1] - 1; n++) {
+        int argmax_idx = argmax(predict_batch + n * predict_shape[1],
+                                predict_batch + (n + 1) * predict_shape[1]);
+        float max_value = predict_batch[n * predict_shape[1] + argmax_idx];
+        if (blank - 1 - argmax_idx > 1e-5) {
+            score += max_value;
+            count += 1;
+        }
+
+    }
+    if (count == 0) {
+        LOGE("calc score count 0");
+    } else {
+        score /= count;
+    }
+    LOGI("calc score: %f", score);
+    return score;
+
+}
+
+
+NET_TYPE OCR_PPredictor::get_net_flag() const {
+    return NET_OCR;
+}
+}
\ No newline at end of file