DbNet.cpp

#include "DbNet.h"
#include "OcrUtils.h"

DbNet::DbNet() {}

DbNet::~DbNet() {
    delete session;
    for (auto name : inputNames) {
        free(name);
    }
    for (auto name : outputNames) {
        free(name);
    }
}

void DbNet::setNumThread(int numOfThread) {
    numThread = numOfThread;
    //===session options===
    // Sets the number of threads used to parallelize the execution within nodes
    // A value of 0 means ORT will pick a default
    //sessionOptions.SetIntraOpNumThreads(numThread);
    //set OMP_NUM_THREADS=16

    // Sets the number of threads used to parallelize the execution of the graph (across nodes)
    // If sequential execution is enabled this value is ignored
    // A value of 0 means ORT will pick a default
    sessionOptions.SetInterOpNumThreads(numThread);

    // Sets graph optimization level
    // ORT_DISABLE_ALL -> To disable all optimizations
    // ORT_ENABLE_BASIC -> To enable basic optimizations (Such as redundant node removals)
    // ORT_ENABLE_EXTENDED -> To enable extended optimizations (Includes level 1 + more complex optimizations like node fusions)
    // ORT_ENABLE_ALL -> To Enable All possible opitmizations
    sessionOptions.SetGraphOptimizationLevel(GraphOptimizationLevel::ORT_ENABLE_EXTENDED);
}

void DbNet::initModel(const std::string &pathStr) {
#ifdef _WIN32
    std::wstring detPath = strToWstr(pathStr);
    session = new Ort::Session(env, detPath.c_str(), sessionOptions);
#else
    session = new Ort::Session(env, pathStr.c_str(), sessionOptions);
#endif
    inputNames = getInputNames(session);
    outputNames = getOutputNames(session);
}

std::vector<TextBox> findRsBoxes(const cv::Mat &predMat, const cv::Mat &dilateMat, ScaleParam &s,
                                 const float boxScoreThresh, const float unClipRatio) {
    const int longSideThresh = 3;//minBox 长边门限
    const int maxCandidates = 1000;

    std::vector<std::vector<cv::Point>> contours;
    std::vector<cv::Vec4i> hierarchy;

    cv::findContours(dilateMat, contours, hierarchy, cv::RETR_LIST,
                     cv::CHAIN_APPROX_SIMPLE);

    int numContours = contours.size() >= maxCandidates ? maxCandidates : contours.size();

    std::vector<TextBox> rsBoxes;

    for (int i = 0; i < numContours; i++) {
        if (contours[i].size() <= 2) {
            continue;
        }
        cv::RotatedRect minAreaRect = cv::minAreaRect(contours[i]);

        float longSide;
        std::vector<cv::Point2f> minBoxes = getMinBoxes(minAreaRect, longSide);

        if (longSide < longSideThresh) {
            continue;
        }

        float boxScore = boxScoreFast(minBoxes, predMat);
        if (boxScore < boxScoreThresh)
            continue;

        //-----unClip-----
        cv::RotatedRect clipRect = unClip(minBoxes, unClipRatio);
        if (clipRect.size.height < 1.001 && clipRect.size.width < 1.001) {
            continue;
        }
        //-----unClip-----

        std::vector<cv::Point2f> clipMinBoxes = getMinBoxes(clipRect, longSide);
        if (longSide < longSideThresh + 2)
            continue;

        std::vector<cv::Point> intClipMinBoxes;

        for (int p = 0; p < clipMinBoxes.size(); p++) {
            float x = clipMinBoxes[p].x / s.ratioWidth;
            float y = clipMinBoxes[p].y / s.ratioHeight;
            int ptX = (std::min)((std::max)(int(x), 0), s.srcWidth - 1);
            int ptY = (std::min)((std::max)(int(y), 0), s.srcHeight - 1);
            cv::Point point{ptX, ptY};
            intClipMinBoxes.push_back(point);
        }
        rsBoxes.push_back(TextBox{intClipMinBoxes, boxScore});
    }
    reverse(rsBoxes.begin(), rsBoxes.end());
    return rsBoxes;
}

std::vector<TextBox>
DbNet::getTextBoxes(cv::Mat &src, ScaleParam &s, float boxScoreThresh, float boxThresh, float unClipRatio) {
    cv::Mat srcResize;
    resize(src, srcResize, cv::Size(s.dstWidth, s.dstHeight));
    std::vector<float> inputTensorValues = substractMeanNormalize(srcResize, meanValues, normValues);
    std::array<int64_t, 4> inputShape{1, srcResize.channels(), srcResize.rows, srcResize.cols};
    auto memoryInfo = Ort::MemoryInfo::CreateCpu(OrtDeviceAllocator, OrtMemTypeCPU);
    Ort::Value inputTensor = Ort::Value::CreateTensor<float>(memoryInfo, inputTensorValues.data(),
                                                             inputTensorValues.size(), inputShape.data(),
                                                             inputShape.size());
    assert(inputTensor.IsTensor());
    auto outputTensor = session->Run(Ort::RunOptions{nullptr}, inputNames.data(), &inputTensor,
                                     inputNames.size(), outputNames.data(), outputNames.size());
    assert(outputTensor.size() == 1 && outputTensor.front().IsTensor());
    std::vector<int64_t> outputShape = outputTensor[0].GetTensorTypeAndShapeInfo().GetShape();
    int64_t outputCount = std::accumulate(outputShape.begin(), outputShape.end(), 1,
                                          std::multiplies<int64_t>());
    float *floatArray = outputTensor.front().GetTensorMutableData<float>();
    std::vector<float> outputData(floatArray, floatArray + outputCount);

    //-----Data preparation-----
    int outHeight = outputShape[2];
    int outWidth = outputShape[3];
    int area = outHeight * outWidth;

    std::vector<float> predData(area, 0.0);
    std::vector<unsigned char> cbufData(area, ' ');

    for (int i = 0; i < area; i++) {
        predData[i] = float(outputData[i]);
        cbufData[i] = (unsigned char) ((outputData[i]) * 255);
    }

    cv::Mat predMat(outHeight, outWidth, CV_32F, (float *) predData.data());
    cv::Mat cBufMat(outHeight, outWidth, CV_8UC1, (unsigned char *) cbufData.data());

    //-----boxThresh-----
    const double maxValue = 255;
    const double threshold = boxThresh * 255;
    cv::Mat thresholdMat;
    cv::threshold(cBufMat, thresholdMat, threshold, maxValue, cv::THRESH_BINARY);

    //-----dilate-----
    cv::Mat dilateMat;
    cv::Mat dilateElement = cv::getStructuringElement(cv::MORPH_RECT, cv::Size(2, 2));
    cv::dilate(thresholdMat, dilateMat, dilateElement);

    return findRsBoxes(predMat, dilateMat, s, boxScoreThresh, unClipRatio);
}