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| import copy |
| import cv2 |
| import random |
| import numpy as np |
| from PIL import Image |
| from shapely.geometry import Polygon |
|
|
| from ppocr.data.imaug.iaa_augment import IaaAugment |
| from ppocr.data.imaug.random_crop_data import is_poly_outside_rect |
| from tools.infer.utility import get_rotate_crop_image |
|
|
|
|
| class CopyPaste(object): |
| def __init__(self, objects_paste_ratio=0.2, limit_paste=True, **kwargs): |
| self.ext_data_num = 1 |
| self.objects_paste_ratio = objects_paste_ratio |
| self.limit_paste = limit_paste |
| augmenter_args = [{"type": "Resize", "args": {"size": [0.5, 3]}}] |
| self.aug = IaaAugment(augmenter_args) |
|
|
| def __call__(self, data): |
| point_num = data["polys"].shape[1] |
| src_img = data["image"] |
| src_polys = data["polys"].tolist() |
| src_texts = data["texts"] |
| src_ignores = data["ignore_tags"].tolist() |
| ext_data = data["ext_data"][0] |
| ext_image = ext_data["image"] |
| ext_polys = ext_data["polys"] |
| ext_texts = ext_data["texts"] |
| ext_ignores = ext_data["ignore_tags"] |
|
|
| indexes = [i for i in range(len(ext_ignores)) if not ext_ignores[i]] |
| select_num = max(1, min(int(self.objects_paste_ratio * len(ext_polys)), 30)) |
|
|
| random.shuffle(indexes) |
| select_idxs = indexes[:select_num] |
| select_polys = ext_polys[select_idxs] |
| select_ignores = ext_ignores[select_idxs] |
|
|
| src_img = cv2.cvtColor(src_img, cv2.COLOR_BGR2RGB) |
| ext_image = cv2.cvtColor(ext_image, cv2.COLOR_BGR2RGB) |
| src_img = Image.fromarray(src_img).convert("RGBA") |
| for idx, poly, tag in zip(select_idxs, select_polys, select_ignores): |
| box_img = get_rotate_crop_image(ext_image, poly) |
|
|
| src_img, box = self.paste_img(src_img, box_img, src_polys) |
| if box is not None: |
| box = box.tolist() |
| for _ in range(len(box), point_num): |
| box.append(box[-1]) |
| src_polys.append(box) |
| src_texts.append(ext_texts[idx]) |
| src_ignores.append(tag) |
| src_img = cv2.cvtColor(np.array(src_img), cv2.COLOR_RGB2BGR) |
| h, w = src_img.shape[:2] |
| src_polys = np.array(src_polys) |
| src_polys[:, :, 0] = np.clip(src_polys[:, :, 0], 0, w) |
| src_polys[:, :, 1] = np.clip(src_polys[:, :, 1], 0, h) |
| data["image"] = src_img |
| data["polys"] = src_polys |
| data["texts"] = src_texts |
| data["ignore_tags"] = np.array(src_ignores) |
| return data |
|
|
| def paste_img(self, src_img, box_img, src_polys): |
| box_img_pil = Image.fromarray(box_img).convert("RGBA") |
| src_w, src_h = src_img.size |
| box_w, box_h = box_img_pil.size |
|
|
| angle = np.random.randint(0, 360) |
| box = np.array([[[0, 0], [box_w, 0], [box_w, box_h], [0, box_h]]]) |
| box = rotate_bbox(box_img, box, angle)[0] |
| box_img_pil = box_img_pil.rotate(angle, expand=1) |
| box_w, box_h = box_img_pil.width, box_img_pil.height |
| if src_w - box_w < 0 or src_h - box_h < 0: |
| return src_img, None |
|
|
| paste_x, paste_y = self.select_coord( |
| src_polys, box, src_w - box_w, src_h - box_h |
| ) |
| if paste_x is None: |
| return src_img, None |
| box[:, 0] += paste_x |
| box[:, 1] += paste_y |
| r, g, b, A = box_img_pil.split() |
| src_img.paste(box_img_pil, (paste_x, paste_y), mask=A) |
|
|
| return src_img, box |
|
|
| def select_coord(self, src_polys, box, endx, endy): |
| if self.limit_paste: |
| xmin, ymin, xmax, ymax = ( |
| box[:, 0].min(), |
| box[:, 1].min(), |
| box[:, 0].max(), |
| box[:, 1].max(), |
| ) |
| for _ in range(50): |
| paste_x = random.randint(0, endx) |
| paste_y = random.randint(0, endy) |
| xmin1 = xmin + paste_x |
| xmax1 = xmax + paste_x |
| ymin1 = ymin + paste_y |
| ymax1 = ymax + paste_y |
|
|
| num_poly_in_rect = 0 |
| for poly in src_polys: |
| if not is_poly_outside_rect( |
| poly, xmin1, ymin1, xmax1 - xmin1, ymax1 - ymin1 |
| ): |
| num_poly_in_rect += 1 |
| break |
| if num_poly_in_rect == 0: |
| return paste_x, paste_y |
| return None, None |
| else: |
| paste_x = random.randint(0, endx) |
| paste_y = random.randint(0, endy) |
| return paste_x, paste_y |
|
|
|
|
| def get_union(pD, pG): |
| return Polygon(pD).union(Polygon(pG)).area |
|
|
|
|
| def get_intersection_over_union(pD, pG): |
| return get_intersection(pD, pG) / get_union(pD, pG) |
|
|
|
|
| def get_intersection(pD, pG): |
| return Polygon(pD).intersection(Polygon(pG)).area |
|
|
|
|
| def rotate_bbox(img, text_polys, angle, scale=1): |
| """ |
| from https://github.com/WenmuZhou/DBNet.pytorch/blob/master/data_loader/modules/augment.py |
| Args: |
| img: np.ndarray |
| text_polys: np.ndarray N*4*2 |
| angle: int |
| scale: int |
| |
| Returns: |
| |
| """ |
| w = img.shape[1] |
| h = img.shape[0] |
|
|
| rangle = np.deg2rad(angle) |
| nw = abs(np.sin(rangle) * h) + abs(np.cos(rangle) * w) |
| nh = abs(np.cos(rangle) * h) + abs(np.sin(rangle) * w) |
| rot_mat = cv2.getRotationMatrix2D((nw * 0.5, nh * 0.5), angle, scale) |
| rot_move = np.dot(rot_mat, np.array([(nw - w) * 0.5, (nh - h) * 0.5, 0])) |
| rot_mat[0, 2] += rot_move[0] |
| rot_mat[1, 2] += rot_move[1] |
|
|
| |
| rot_text_polys = list() |
| for bbox in text_polys: |
| point1 = np.dot(rot_mat, np.array([bbox[0, 0], bbox[0, 1], 1])) |
| point2 = np.dot(rot_mat, np.array([bbox[1, 0], bbox[1, 1], 1])) |
| point3 = np.dot(rot_mat, np.array([bbox[2, 0], bbox[2, 1], 1])) |
| point4 = np.dot(rot_mat, np.array([bbox[3, 0], bbox[3, 1], 1])) |
| rot_text_polys.append([point1, point2, point3, point4]) |
| return np.array(rot_text_polys, dtype=np.float32) |
|
|
