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| # -*- coding: utf-8 -*- | |
| # Copyright (c) Alibaba, Inc. and its affiliates. | |
| import random | |
| import cv2 | |
| import numpy as np | |
| from .utils import convert_to_numpy | |
| class RegionCanvasAnnotator: | |
| def __init__(self, cfg, device=None): | |
| self.scale_range = cfg.get('SCALE_RANGE', [0.75, 1.0]) | |
| self.canvas_value = cfg.get('CANVAS_VALUE', 255) | |
| self.use_resize = cfg.get('USE_RESIZE', True) | |
| self.use_canvas = cfg.get('USE_CANVAS', True) | |
| self.use_aug = cfg.get('USE_AUG', False) | |
| if self.use_aug: | |
| from .maskaug import MaskAugAnnotator | |
| self.maskaug_anno = MaskAugAnnotator(cfg={}) | |
| def forward(self, image, mask, mask_cfg=None): | |
| image = convert_to_numpy(image) | |
| mask = convert_to_numpy(mask) | |
| image_h, image_w = image.shape[:2] | |
| if self.use_aug: | |
| mask = self.maskaug_anno.forward(mask, mask_cfg) | |
| # get region with white bg | |
| image[np.array(mask) == 0] = self.canvas_value | |
| x, y, w, h = cv2.boundingRect(mask) | |
| region_crop = image[y:y + h, x:x + w] | |
| if self.use_resize: | |
| # resize region | |
| scale_min, scale_max = self.scale_range | |
| scale_factor = random.uniform(scale_min, scale_max) | |
| new_w, new_h = int(image_w * scale_factor), int(image_h * scale_factor) | |
| obj_scale_factor = min(new_w/w, new_h/h) | |
| new_w = int(w * obj_scale_factor) | |
| new_h = int(h * obj_scale_factor) | |
| region_crop_resized = cv2.resize(region_crop, (new_w, new_h), interpolation=cv2.INTER_AREA) | |
| else: | |
| region_crop_resized = region_crop | |
| if self.use_canvas: | |
| # plot region into canvas | |
| new_canvas = np.ones_like(image) * self.canvas_value | |
| max_x = max(0, image_w - new_w) | |
| max_y = max(0, image_h - new_h) | |
| new_x = random.randint(0, max_x) | |
| new_y = random.randint(0, max_y) | |
| new_canvas[new_y:new_y + new_h, new_x:new_x + new_w] = region_crop_resized | |
| else: | |
| new_canvas = region_crop_resized | |
| return new_canvas |