feat(rapidocr_paddle): support to char rec and bump to v1.4.0

python/rapidocr_paddle/cal_rec_boxes/__init__.py

@@ -0,0 +1,4 @@
+# -*- encoding: utf-8 -*-
+# @Author: SWHL
+# @Contact: [email protected]
+from .main import CalRecBoxes

python/rapidocr_paddle/cal_rec_boxes/main.py

@@ -0,0 +1,260 @@
+# -*- encoding: utf-8 -*-
+# @Author: SWHL / Joker1212
+# @Contact: [email protected]
+import copy
+import math
+from typing import Any, List, Optional, Tuple
+
+import cv2
+import numpy as np
+
+
+class CalRecBoxes:
+    """计算识别文字的汉字单字和英文单词的坐标框。代码借鉴自PaddlePaddle/PaddleOCR和fanqie03/char-detection"""
+
+    def __init__(self):
+        pass
+
+    def __call__(
+        self,
+        imgs: Optional[List[np.ndarray]],
+        dt_boxes: Optional[List[np.ndarray]],
+        rec_res: Optional[List[Any]],
+    ):
+        res = []
+        for img, box, rec_res in zip(imgs, dt_boxes, rec_res):
+            direction = self.get_box_direction(box)
+
+            rec_txt, rec_conf, rec_word_info = rec_res[0], rec_res[1], rec_res[2]
+            h, w = img.shape[:2]
+            img_box = np.array([[0, 0], [w, 0], [w, h], [0, h]])
+            word_box_content_list, word_box_list = self.cal_ocr_word_box(
+                rec_txt, img_box, rec_word_info
+            )
+            word_box_list = self.adjust_box_overlap(copy.deepcopy(word_box_list))
+            word_box_list = self.reverse_rotate_crop_image(
+                copy.deepcopy(box), word_box_list, direction
+            )
+            res.append([rec_txt, rec_conf, word_box_list, word_box_content_list])
+        return res
+
+    @staticmethod
+    def get_box_direction(box: np.ndarray) -> str:
+        direction = "w"
+        img_crop_width = int(
+            max(
+                np.linalg.norm(box[0] - box[1]),
+                np.linalg.norm(box[2] - box[3]),
+            )
+        )
+        img_crop_height = int(
+            max(
+                np.linalg.norm(box[0] - box[3]),
+                np.linalg.norm(box[1] - box[2]),
+            )
+        )
+        if img_crop_height * 1.0 / img_crop_width >= 1.5:
+            direction = "h"
+        return direction
+
+    @staticmethod
+    def cal_ocr_word_box(
+        rec_txt: str, box: np.ndarray, rec_word_info: List[Tuple[str, List[int]]]
+    ) -> Tuple[List[str], List[List[int]]]:
+        """Calculate the detection frame for each word based on the results of recognition and detection of ocr
+        汉字坐标是单字的
+        英语坐标是单词级别的
+        """
+
+        col_num, word_list, word_col_list, state_list = rec_word_info
+        box = box.tolist()
+        bbox_x_start = box[0][0]
+        bbox_x_end = box[1][0]
+        bbox_y_start = box[0][1]
+        bbox_y_end = box[2][1]
+
+        cell_width = (bbox_x_end - bbox_x_start) / col_num
+        word_box_list = []
+        word_box_content_list = []
+        cn_width_list = []
+        cn_col_list = []
+        for word, word_col, state in zip(word_list, word_col_list, state_list):
+            if state == "cn":
+                if len(word_col) != 1:
+                    char_seq_length = (word_col[-1] - word_col[0] + 1) * cell_width
+                    char_width = char_seq_length / (len(word_col) - 1)
+                    cn_width_list.append(char_width)
+                cn_col_list += word_col
+                word_box_content_list += word
+            else:
+                cell_x_start = bbox_x_start + int(word_col[0] * cell_width)
+                cell_x_end = bbox_x_start + int((word_col[-1] + 1) * cell_width)
+                cell = [
+                    [cell_x_start, bbox_y_start],
+                    [cell_x_end, bbox_y_start],
+                    [cell_x_end, bbox_y_end],
+                    [cell_x_start, bbox_y_end],
+                ]
+                word_box_list.append(cell)
+                word_box_content_list.append("".join(word))
+
+        if len(cn_col_list) != 0:
+            if len(cn_width_list) != 0:
+                avg_char_width = np.mean(cn_width_list)
+            else:
+                avg_char_width = (bbox_x_end - bbox_x_start) / len(rec_txt)
+
+            for center_idx in cn_col_list:
+                center_x = (center_idx + 0.5) * cell_width
+                cell_x_start = max(int(center_x - avg_char_width / 2), 0) + bbox_x_start
+                cell_x_end = (
+                    min(int(center_x + avg_char_width / 2), bbox_x_end - bbox_x_start)
+                    + bbox_x_start
+                )
+                cell = [
+                    [cell_x_start, bbox_y_start],
+                    [cell_x_end, bbox_y_start],
+                    [cell_x_end, bbox_y_end],
+                    [cell_x_start, bbox_y_end],
+                ]
+                word_box_list.append(cell)
+        sorted_word_box_list = sorted(word_box_list, key=lambda box: box[0][0])
+        return word_box_content_list, sorted_word_box_list
+
+    @staticmethod
+    def adjust_box_overlap(
+        word_box_list: List[List[List[int]]],
+    ) -> List[List[List[int]]]:
+        # 调整bbox有重叠的地方
+        for i in range(len(word_box_list) - 1):
+            cur, nxt = word_box_list[i], word_box_list[i + 1]
+            if cur[1][0] > nxt[0][0]:  # 有交集
+                distance = abs(cur[1][0] - nxt[0][0])
+                cur[1][0] -= distance / 2
+                cur[2][0] -= distance / 2
+                nxt[0][0] += distance / 2
+                nxt[3][0] += distance / 2
+        return word_box_list
+
+    def reverse_rotate_crop_image(
+        self,
+        bbox_points: np.ndarray,
+        word_points_list: List[List[List[int]]],
+        direction: str = "w",
+    ) -> List[List[List[int]]]:
+        """
+        get_rotate_crop_image的逆操作
+        img为原图
+        part_img为crop后的图
+        bbox_points为part_img中对应在原图的bbox, 四个点，左上，右上，右下，左下
+        part_points为在part_img中的点[(x, y), (x, y)]
+        """
+        bbox_points = np.float32(bbox_points)
+
+        left = int(np.min(bbox_points[:, 0]))
+        top = int(np.min(bbox_points[:, 1]))
+        bbox_points[:, 0] = bbox_points[:, 0] - left
+        bbox_points[:, 1] = bbox_points[:, 1] - top
+
+        img_crop_width = int(np.linalg.norm(bbox_points[0] - bbox_points[1]))
+        img_crop_height = int(np.linalg.norm(bbox_points[0] - bbox_points[3]))
+
+        pts_std = np.array(
+            [
+                [0, 0],
+                [img_crop_width, 0],
+                [img_crop_width, img_crop_height],
+                [0, img_crop_height],
+            ]
+        ).astype(np.float32)
+        M = cv2.getPerspectiveTransform(bbox_points, pts_std)
+        _, IM = cv2.invert(M)
+
+        new_word_points_list = []
+        for word_points in word_points_list:
+            new_word_points = []
+            for point in word_points:
+                new_point = point
+                if direction == "h":
+                    new_point = self.s_rotate(
+                        math.radians(-90), new_point[0], new_point[1], 0, 0
+                    )
+                    new_point[0] = new_point[0] + img_crop_width
+
+                p = np.float32(new_point + [1])
+                x, y, z = np.dot(IM, p)
+                new_point = [x / z, y / z]
+
+                new_point = [int(new_point[0] + left), int(new_point[1] + top)]
+                new_word_points.append(new_point)
+            new_word_points = self.order_points(new_word_points)
+            new_word_points_list.append(new_word_points)
+        return new_word_points_list
+
+    @staticmethod
+    def s_rotate(angle, valuex, valuey, pointx, pointy):
+        """绕pointx,pointy顺时针旋转
+        https://blog.csdn.net/qq_38826019/article/details/84233397
+        """
+        valuex = np.array(valuex)
+        valuey = np.array(valuey)
+        sRotatex = (
+            (valuex - pointx) * math.cos(angle)
+            + (valuey - pointy) * math.sin(angle)
+            + pointx
+        )
+        sRotatey = (
+            (valuey - pointy) * math.cos(angle)
+            - (valuex - pointx) * math.sin(angle)
+            + pointy
+        )
+        return [sRotatex, sRotatey]
+
+    @staticmethod
+    def order_points(box: List[List[int]]) -> List[List[int]]:
+        """矩形框顺序排列"""
+        box = np.array(box).reshape((-1, 2))
+        center_x, center_y = np.mean(box[:, 0]), np.mean(box[:, 1])
+        if np.any(box[:, 0] == center_x) and np.any(
+            box[:, 1] == center_y
+        ):  # 有两点横坐标相等，有两点纵坐标相等，菱形
+            p1 = box[np.where(box[:, 0] == np.min(box[:, 0]))]
+            p2 = box[np.where(box[:, 1] == np.min(box[:, 1]))]
+            p3 = box[np.where(box[:, 0] == np.max(box[:, 0]))]
+            p4 = box[np.where(box[:, 1] == np.max(box[:, 1]))]
+        elif np.all(box[:, 0] == center_x):  # 四个点的横坐标都相同
+            y_sort = np.argsort(box[:, 1])
+            p1 = box[y_sort[0]]
+            p2 = box[y_sort[1]]
+            p3 = box[y_sort[2]]
+            p4 = box[y_sort[3]]
+        elif np.any(box[:, 0] == center_x) and np.all(
+            box[:, 1] != center_y
+        ):  # 只有两点横坐标相等，先上下再左右
+            p12, p34 = (
+                box[np.where(box[:, 1] < center_y)],
+                box[np.where(box[:, 1] > center_y)],
+            )
+            p1, p2 = (
+                p12[np.where(p12[:, 0] == np.min(p12[:, 0]))],
+                p12[np.where(p12[:, 0] == np.max(p12[:, 0]))],
+            )
+            p3, p4 = (
+                p34[np.where(p34[:, 0] == np.max(p34[:, 0]))],
+                p34[np.where(p34[:, 0] == np.min(p34[:, 0]))],
+            )
+        else:  # 只有两点纵坐标相等，或者是没有相等的，先左右再上下
+            p14, p23 = (
+                box[np.where(box[:, 0] < center_x)],
+                box[np.where(box[:, 0] > center_x)],
+            )
+            p1, p4 = (
+                p14[np.where(p14[:, 1] == np.min(p14[:, 1]))],
+                p14[np.where(p14[:, 1] == np.max(p14[:, 1]))],
+            )
+            p2, p3 = (
+                p23[np.where(p23[:, 1] == np.min(p23[:, 1]))],
+                p23[np.where(p23[:, 1] == np.max(p23[:, 1]))],
+            )
+
+        return np.array([p1, p2, p3, p4]).reshape((-1, 2)).tolist()

python/rapidocr_paddle/ch_ppocr_rec/text_recognize.py

@@ -36,10 +36,12 @@ def __init__(self, config):
         self.character_dict_path = dict_path if dict_path else DEFAULT_DICT_PATH
         self.postprocess_op = CTCLabelDecode(character_path=self.character_dict_path)
 
-        self.infer = PaddleInferSession(config, mode="rec")
+        self.session = PaddleInferSession(config, mode="rec")
 
     def __call__(
-        self, img_list: Union[np.ndarray, List[np.ndarray]]
+        self,
+        img_list: Union[np.ndarray, List[np.ndarray]],
+        return_word_box: bool = False,
     ) -> Tuple[List[Tuple[str, float]], float]:
         if isinstance(img_list, np.ndarray):
             img_list = [img_list]
@@ -57,11 +59,16 @@ def __call__(
         elapse = 0
         for beg_img_no in range(0, img_num, batch_num):
             end_img_no = min(img_num, beg_img_no + batch_num)
-            max_wh_ratio = 0
+
+            # Parameter Alignment for PaddleOCR
+            imgC, imgH, imgW = self.rec_image_shape[:3]
+            max_wh_ratio = imgW / imgH
+            wh_ratio_list = []
             for ino in range(beg_img_no, end_img_no):
                 h, w = img_list[indices[ino]].shape[0:2]
                 wh_ratio = w * 1.0 / h
                 max_wh_ratio = max(max_wh_ratio, wh_ratio)
+                wh_ratio_list.append(wh_ratio)
 
             norm_img_batch = []
             for ino in range(beg_img_no, end_img_no):
@@ -70,8 +77,13 @@ def __call__(
             norm_img_batch = np.concatenate(norm_img_batch).astype(np.float32)
 
             starttime = time.time()
-            preds = self.infer(norm_img_batch)[0]
-            rec_result = self.postprocess_op(preds)
+            preds = self.session(norm_img_batch)[0]
+            rec_result = self.postprocess_op(
+                preds,
+                return_word_box,
+                wh_ratio_list=wh_ratio_list,
+                max_wh_ratio=max_wh_ratio,
+            )
 
             for rno, one_res in enumerate(rec_result):
                 rec_res[indices[beg_img_no + rno]] = one_res