open cv 检测矩形是否闭合

Question

两个图中四个顶点的对应坐标是一样，那么如何通过 opencv api 检测到以上两张图片内容的不同。

Answer 1

import cv2  
  
# 读取图片  
img1 = cv2.imread('image1.jpg')  
img2 = cv2.imread('image2.jpg')  
  
# 检测第一个矩形  
rect1 = cv2.minAreaRect(cv2.findContours(img1, cv2.RETR_EXTERNAL))  
box1 = cv2.boxPoints(rect1)  
pt1 = tuple(box1[0])  
pt2 = tuple(box1[1])  
pt3 = tuple(box1[2])  
pt4 = tuple(box1[3])  
cv2.drawContours(img1, [pt1, pt2, pt3, pt4], -1, (0, 0, 255), 2)  
  
# 检测第二个矩形  
rect2 = cv2.minAreaRect(cv2.findContours(img2, cv2.RETR_EXTERNAL))  
box2 = cv2.boxPoints(rect2)  
pt5 = tuple(box2[0])  
pt6 = tuple(box2[1])  
pt7 = tuple(box2[2])  
pt8 = tuple(box2[3])  
cv2.drawContours(img2, [pt5, pt6, pt7, pt8], -1, (0, 0, 255), 2)  
  
# 检查两个矩形是否闭合  
if cv2.isClosed(box1, pt1) == True and cv2.isClosed(box1, pt2) == True and \  
   cv2.isClosed(box1, pt3) == True and cv2.isClosed(box1, pt4) == True and \  
   cv2.isClosed(box2, pt5) == True and cv2.isClosed(box2, pt6) == True and \  
   cv2.isClosed(box2, pt7) == True and cv2.isClosed(box2, pt8) == True:  
    print('The two rectangles are closed.')  
else:  
    print('The two rectangles are not closed.')  
  
# 显示图片  
cv2.imshow('image1', img1)  
cv2.imshow('image2', img2)  
cv2.waitKey(0)  
cv2.destroyAllWindows()