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import math |
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import cv2 |
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import numpy as np |
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from PIL import Image, ImageDraw, ImageFont |
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def crop_image(img, position): |
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def distance(x1,y1,x2,y2): |
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return math.sqrt(pow(x1 - x2, 2) + pow(y1 - y2, 2)) |
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position = position.tolist() |
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for i in range(4): |
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for j in range(i+1, 4): |
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if(position[i][0] > position[j][0]): |
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tmp = position[j] |
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position[j] = position[i] |
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position[i] = tmp |
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if position[0][1] > position[1][1]: |
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tmp = position[0] |
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position[0] = position[1] |
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position[1] = tmp |
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if position[2][1] > position[3][1]: |
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tmp = position[2] |
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position[2] = position[3] |
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position[3] = tmp |
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x1, y1 = position[0][0], position[0][1] |
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x2, y2 = position[2][0], position[2][1] |
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x3, y3 = position[3][0], position[3][1] |
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x4, y4 = position[1][0], position[1][1] |
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corners = np.zeros((4,2), np.float32) |
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corners[0] = [x1, y1] |
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corners[1] = [x2, y2] |
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corners[2] = [x4, y4] |
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corners[3] = [x3, y3] |
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img_width = distance((x1+x4)/2, (y1+y4)/2, (x2+x3)/2, (y2+y3)/2) |
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img_height = distance((x1+x2)/2, (y1+y2)/2, (x4+x3)/2, (y4+y3)/2) |
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corners_trans = np.zeros((4,2), np.float32) |
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corners_trans[0] = [0, 0] |
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corners_trans[1] = [img_width - 1, 0] |
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corners_trans[2] = [0, img_height - 1] |
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corners_trans[3] = [img_width - 1, img_height - 1] |
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transform = cv2.getPerspectiveTransform(corners, corners_trans) |
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dst = cv2.warpPerspective(img, transform, (int(img_width), int(img_height))) |
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return dst |
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def calculate_size(box): |
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return (box[2]-box[0]) * (box[3]-box[1]) |
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def calculate_iou(box1, box2): |
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xA = max(box1[0], box2[0]) |
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yA = max(box1[1], box2[1]) |
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xB = min(box1[2], box2[2]) |
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yB = min(box1[3], box2[3]) |
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interArea = max(0, xB - xA) * max(0, yB - yA) |
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box1Area = (box1[2] - box1[0]) * (box1[3] - box1[1]) |
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box2Area = (box2[2] - box2[0]) * (box2[3] - box2[1]) |
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unionArea = box1Area + box2Area - interArea |
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iou = interArea / unionArea |
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return iou |
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def crop(image, box, i, text_data=None): |
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image = Image.open(image) |
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if text_data: |
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draw = ImageDraw.Draw(image) |
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draw.rectangle(((text_data[0], text_data[1]), (text_data[2], text_data[3])), outline="red", width=5) |
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cropped_image = image.crop(box) |
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cropped_image.save(f"./temp/{i}.jpg") |
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def in_box(box, target): |
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if (box[0] > target[0]) and (box[1] > target[1]) and (box[2] < target[2]) and (box[3] < target[3]): |
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return True |
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else: |
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return False |
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