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import numpy as np |
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import cv2 |
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from .data_process import DataProcess |
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from concern.config import Configurable, State |
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class RandomCropData(DataProcess): |
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size = State(default=(512, 512)) |
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max_tries = State(default=50) |
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min_crop_side_ratio = State(default=0.1) |
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require_original_image = State(default=False) |
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def __init__(self, **kwargs): |
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self.load_all(**kwargs) |
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def process(self, data): |
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img = data['image'] |
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ori_img = img |
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ori_lines = data['polys'] |
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all_care_polys = [line['points'] |
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for line in data['polys'] if not line['ignore']] |
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crop_x, crop_y, crop_w, crop_h = self.crop_area(img, all_care_polys) |
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scale_w = self.size[0] / crop_w |
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scale_h = self.size[1] / crop_h |
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scale = min(scale_w, scale_h) |
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h = int(crop_h * scale) |
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w = int(crop_w * scale) |
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padimg = np.zeros( |
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(self.size[1], self.size[0], img.shape[2]), img.dtype) |
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padimg[:h, :w] = cv2.resize( |
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img[crop_y:crop_y + crop_h, crop_x:crop_x + crop_w], (w, h)) |
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img = padimg |
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lines = [] |
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for line in data['polys']: |
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poly = ((np.array(line['points']) - |
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(crop_x, crop_y)) * scale).tolist() |
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if not self.is_poly_outside_rect(poly, 0, 0, w, h): |
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lines.append({**line, 'points': poly}) |
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data['polys'] = lines |
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if self.require_original_image: |
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data['image'] = ori_img |
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else: |
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data['image'] = img |
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data['lines'] = ori_lines |
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data['scale_w'] = scale |
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data['scale_h'] = scale |
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return data |
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def is_poly_in_rect(self, poly, x, y, w, h): |
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poly = np.array(poly) |
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if poly[:, 0].min() < x or poly[:, 0].max() > x + w: |
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return False |
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if poly[:, 1].min() < y or poly[:, 1].max() > y + h: |
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return False |
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return True |
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def is_poly_outside_rect(self, poly, x, y, w, h): |
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poly = np.array(poly) |
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if poly[:, 0].max() < x or poly[:, 0].min() > x + w: |
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return True |
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if poly[:, 1].max() < y or poly[:, 1].min() > y + h: |
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return True |
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return False |
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def split_regions(self, axis): |
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regions = [] |
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min_axis = 0 |
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for i in range(1, axis.shape[0]): |
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if axis[i] != axis[i-1] + 1: |
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region = axis[min_axis:i] |
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min_axis = i |
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regions.append(region) |
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return regions |
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def random_select(self, axis, max_size): |
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xx = np.random.choice(axis, size=2) |
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xmin = np.min(xx) |
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xmax = np.max(xx) |
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xmin = np.clip(xmin, 0, max_size - 1) |
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xmax = np.clip(xmax, 0, max_size - 1) |
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return xmin, xmax |
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def region_wise_random_select(self, regions, max_size): |
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selected_index = list(np.random.choice(len(regions), 2)) |
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selected_values = [] |
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for index in selected_index: |
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axis = regions[index] |
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xx = int(np.random.choice(axis, size=1)) |
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selected_values.append(xx) |
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xmin = min(selected_values) |
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xmax = max(selected_values) |
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return xmin, xmax |
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def crop_area(self, img, polys): |
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h, w, _ = img.shape |
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h_array = np.zeros(h, dtype=np.int32) |
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w_array = np.zeros(w, dtype=np.int32) |
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for points in polys: |
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points = np.round(points, decimals=0).astype(np.int32) |
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minx = np.min(points[:, 0]) |
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maxx = np.max(points[:, 0]) |
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w_array[minx:maxx] = 1 |
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miny = np.min(points[:, 1]) |
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maxy = np.max(points[:, 1]) |
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h_array[miny:maxy] = 1 |
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h_axis = np.where(h_array == 0)[0] |
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w_axis = np.where(w_array == 0)[0] |
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if len(h_axis) == 0 or len(w_axis) == 0: |
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return 0, 0, w, h |
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h_regions = self.split_regions(h_axis) |
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w_regions = self.split_regions(w_axis) |
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for i in range(self.max_tries): |
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if len(w_regions) > 1: |
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xmin, xmax = self.region_wise_random_select(w_regions, w) |
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else: |
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xmin, xmax = self.random_select(w_axis, w) |
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if len(h_regions) > 1: |
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ymin, ymax = self.region_wise_random_select(h_regions, h) |
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else: |
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ymin, ymax = self.random_select(h_axis, h) |
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if xmax - xmin < self.min_crop_side_ratio * w or ymax - ymin < self.min_crop_side_ratio * h: |
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continue |
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num_poly_in_rect = 0 |
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for poly in polys: |
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if not self.is_poly_outside_rect(poly, xmin, ymin, xmax - xmin, ymax - ymin): |
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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 xmin, ymin, xmax - xmin, ymax - ymin |
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return 0, 0, w, h |
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