python---opencv常用函数

求点的最小外接矩

 rect1 = cv2.minAreaRect(box):

 

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def back_forward_convert(coordinate, with_label=True):     """     :param coordinate: format [x1, y1, x2, y2, x3, y3, x4, y4, (label)]     :param with_label: default True     :return: format [x_c, y_c, w, h, theta, (label)]     """       boxes = []     if with_label:         for rect in coordinate:             box = np.int0(rect[:-1])             box = box.reshape([4, 2])             rect1 = cv2.minAreaRect(box)               x, y, w, h, theta = rect1[0][0], rect1[0][1], rect1[1][0], rect1[1][1], rect1[2]             boxes.append([x, y, w, h, theta, rect[-1]])       else:         for rect in coordinate:             box = np.int0(rect)             box = box.reshape([4, 2])             rect1 = cv2.minAreaRect(box)               x, y, w, h, theta = rect1[0][0], rect1[0][1], rect1[1][0], rect1[1][1], rect1[2]             boxes.append([x, y, w, h, theta])       return np.array(boxes, dtype=np.float32)