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ppocr/data/imaug/copy_paste.py
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179
ppocr/data/imaug/copy_paste.py
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# copyright (c) 2021 PaddlePaddle Authors. All Rights Reserve.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import copy
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import cv2
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import random
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import numpy as np
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from PIL import Image
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from shapely.geometry import Polygon
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from ppocr.data.imaug.iaa_augment import IaaAugment
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from ppocr.data.imaug.random_crop_data import is_poly_outside_rect
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from tools.infer.utility import get_rotate_crop_image
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class CopyPaste(object):
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def __init__(self, objects_paste_ratio=0.2, limit_paste=True, **kwargs):
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self.ext_data_num = 1
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self.objects_paste_ratio = objects_paste_ratio
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self.limit_paste = limit_paste
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augmenter_args = [{"type": "Resize", "args": {"size": [0.5, 3]}}]
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self.aug = IaaAugment(augmenter_args)
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def __call__(self, data):
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point_num = data["polys"].shape[1]
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src_img = data["image"]
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src_polys = data["polys"].tolist()
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src_texts = data["texts"]
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src_ignores = data["ignore_tags"].tolist()
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ext_data = data["ext_data"][0]
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ext_image = ext_data["image"]
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ext_polys = ext_data["polys"]
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ext_texts = ext_data["texts"]
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ext_ignores = ext_data["ignore_tags"]
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indexes = [i for i in range(len(ext_ignores)) if not ext_ignores[i]]
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select_num = max(1, min(int(self.objects_paste_ratio * len(ext_polys)), 30))
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random.shuffle(indexes)
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select_idxs = indexes[:select_num]
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select_polys = ext_polys[select_idxs]
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select_ignores = ext_ignores[select_idxs]
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src_img = cv2.cvtColor(src_img, cv2.COLOR_BGR2RGB)
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ext_image = cv2.cvtColor(ext_image, cv2.COLOR_BGR2RGB)
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src_img = Image.fromarray(src_img).convert("RGBA")
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for idx, poly, tag in zip(select_idxs, select_polys, select_ignores):
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box_img = get_rotate_crop_image(ext_image, poly)
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src_img, box = self.paste_img(src_img, box_img, src_polys)
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if box is not None:
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box = box.tolist()
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for _ in range(len(box), point_num):
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box.append(box[-1])
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src_polys.append(box)
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src_texts.append(ext_texts[idx])
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src_ignores.append(tag)
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src_img = cv2.cvtColor(np.array(src_img), cv2.COLOR_RGB2BGR)
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h, w = src_img.shape[:2]
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src_polys = np.array(src_polys)
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src_polys[:, :, 0] = np.clip(src_polys[:, :, 0], 0, w)
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src_polys[:, :, 1] = np.clip(src_polys[:, :, 1], 0, h)
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data["image"] = src_img
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data["polys"] = src_polys
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data["texts"] = src_texts
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data["ignore_tags"] = np.array(src_ignores)
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return data
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def paste_img(self, src_img, box_img, src_polys):
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box_img_pil = Image.fromarray(box_img).convert("RGBA")
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src_w, src_h = src_img.size
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box_w, box_h = box_img_pil.size
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angle = np.random.randint(0, 360)
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box = np.array([[[0, 0], [box_w, 0], [box_w, box_h], [0, box_h]]])
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box = rotate_bbox(box_img, box, angle)[0]
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box_img_pil = box_img_pil.rotate(angle, expand=1)
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box_w, box_h = box_img_pil.width, box_img_pil.height
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if src_w - box_w < 0 or src_h - box_h < 0:
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return src_img, None
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paste_x, paste_y = self.select_coord(
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src_polys, box, src_w - box_w, src_h - box_h
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)
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if paste_x is None:
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return src_img, None
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box[:, 0] += paste_x
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box[:, 1] += paste_y
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r, g, b, A = box_img_pil.split()
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src_img.paste(box_img_pil, (paste_x, paste_y), mask=A)
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return src_img, box
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def select_coord(self, src_polys, box, endx, endy):
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if self.limit_paste:
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xmin, ymin, xmax, ymax = (
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box[:, 0].min(),
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box[:, 1].min(),
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box[:, 0].max(),
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box[:, 1].max(),
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)
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for _ in range(50):
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paste_x = random.randint(0, endx)
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paste_y = random.randint(0, endy)
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xmin1 = xmin + paste_x
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xmax1 = xmax + paste_x
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ymin1 = ymin + paste_y
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ymax1 = ymax + paste_y
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num_poly_in_rect = 0
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for poly in src_polys:
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if not is_poly_outside_rect(
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poly, xmin1, ymin1, xmax1 - xmin1, ymax1 - ymin1
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):
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num_poly_in_rect += 1
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break
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if num_poly_in_rect == 0:
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return paste_x, paste_y
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return None, None
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else:
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paste_x = random.randint(0, endx)
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paste_y = random.randint(0, endy)
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return paste_x, paste_y
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def get_union(pD, pG):
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return Polygon(pD).union(Polygon(pG)).area
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def get_intersection_over_union(pD, pG):
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return get_intersection(pD, pG) / get_union(pD, pG)
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def get_intersection(pD, pG):
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return Polygon(pD).intersection(Polygon(pG)).area
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def rotate_bbox(img, text_polys, angle, scale=1):
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"""
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from https://github.com/WenmuZhou/DBNet.pytorch/blob/master/data_loader/modules/augment.py
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Args:
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img: np.ndarray
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text_polys: np.ndarray N*4*2
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angle: int
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scale: int
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Returns:
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"""
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w = img.shape[1]
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h = img.shape[0]
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rangle = np.deg2rad(angle)
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nw = abs(np.sin(rangle) * h) + abs(np.cos(rangle) * w)
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nh = abs(np.cos(rangle) * h) + abs(np.sin(rangle) * w)
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rot_mat = cv2.getRotationMatrix2D((nw * 0.5, nh * 0.5), angle, scale)
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rot_move = np.dot(rot_mat, np.array([(nw - w) * 0.5, (nh - h) * 0.5, 0]))
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rot_mat[0, 2] += rot_move[0]
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rot_mat[1, 2] += rot_move[1]
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# ---------------------- rotate box ----------------------
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rot_text_polys = list()
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for bbox in text_polys:
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point1 = np.dot(rot_mat, np.array([bbox[0, 0], bbox[0, 1], 1]))
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point2 = np.dot(rot_mat, np.array([bbox[1, 0], bbox[1, 1], 1]))
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point3 = np.dot(rot_mat, np.array([bbox[2, 0], bbox[2, 1], 1]))
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point4 = np.dot(rot_mat, np.array([bbox[3, 0], bbox[3, 1], 1]))
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rot_text_polys.append([point1, point2, point3, point4])
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return np.array(rot_text_polys, dtype=np.float32)
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