rapid_table.py

import os
import html
import cv2
import numpy as np
from loguru import logger
from rapid_table import RapidTable, RapidTableInput

from mineru.utils.enum_class import ModelPath
from mineru.utils.models_download_utils import auto_download_and_get_model_root_path


def escape_html(input_string):
    """Escape HTML Entities."""
    return html.escape(input_string)


class RapidTableModel(object):
    def __init__(self, ocr_engine):
        slanet_plus_model_path = os.path.join(auto_download_and_get_model_root_path(ModelPath.slanet_plus), ModelPath.slanet_plus)
        input_args = RapidTableInput(model_type='slanet_plus', model_path=slanet_plus_model_path)
        self.table_model = RapidTable(input_args)
        self.ocr_engine = ocr_engine


    def predict(self, image):
        bgr_image = cv2.cvtColor(np.asarray(image), cv2.COLOR_RGB2BGR)

        # First check the overall image aspect ratio (height/width)
        img_height, img_width = bgr_image.shape[:2]
        img_aspect_ratio = img_height / img_width if img_width > 0 else 1.0
        img_is_portrait = img_aspect_ratio > 1.2

        if img_is_portrait:

            det_res = self.ocr_engine.ocr(bgr_image, rec=False)[0]
            # Check if table is rotated by analyzing text box aspect ratios
            is_rotated = False
            if det_res:
                vertical_count = 0

                for box_ocr_res in det_res:
                    p1, p2, p3, p4 = box_ocr_res

                    # Calculate width and height
                    width = p3[0] - p1[0]
                    height = p3[1] - p1[1]

                    aspect_ratio = width / height if height > 0 else 1.0

                    # Count vertical vs horizontal text boxes
                    if aspect_ratio < 0.8:  # Taller than wide - vertical text
                        vertical_count += 1
                    # elif aspect_ratio > 1.2:  # Wider than tall - horizontal text
                    #     horizontal_count += 1

                # If we have more vertical text boxes than horizontal ones,
                # and vertical ones are significant, table might be rotated
                if vertical_count >= len(det_res) * 0.3:
                    is_rotated = True

                # logger.debug(f"Text orientation analysis: vertical={vertical_count}, det_res={len(det_res)}, rotated={is_rotated}")

            # Rotate image if necessary
            if is_rotated:
                # logger.debug("Table appears to be in portrait orientation, rotating 90 degrees clockwise")
                image = cv2.rotate(np.asarray(image), cv2.ROTATE_90_CLOCKWISE)
                bgr_image = cv2.cvtColor(image, cv2.COLOR_RGB2BGR)

        # Continue with OCR on potentially rotated image
        ocr_result = self.ocr_engine.ocr(bgr_image)[0]
        if ocr_result:
            ocr_result = [[item[0], escape_html(item[1][0]), item[1][1]] for item in ocr_result if
                      len(item) == 2 and isinstance(item[1], tuple)]
        else:
            ocr_result = None


        if ocr_result:
            try:
                table_results = self.table_model(np.asarray(image), ocr_result)
                html_code = table_results.pred_html
                table_cell_bboxes = table_results.cell_bboxes
                logic_points = table_results.logic_points
                elapse = table_results.elapse
                return html_code, table_cell_bboxes, logic_points, elapse
            except Exception as e:
                logger.exception(e)

        return None, None, None, None