Python OpenCV判断两张图片是否一样

import cv2
import numpy as np
#import os
 
file1= "1.jpg"
file2="2.jpg"
 
image1 = cv2.imread(file1)
image2 = cv2.imread(file2)
difference = cv2.subtract(image1, image2)
print(difference)
result = not np.any(difference) #if difference is all zeros it will return False

if result is True:
     print("两张图片一样")
else:
     cv2.imwrite("result.jpg", difference)
     print ("两张图片不一样")

相邻帧图片的差异产生的result.jpg

判断视频内某一区域是否发生变化，如果发生变化，将当前帧图片保存。

import cv2
import numpy as np
#读取图片
img1=cv2.imread('none1.jpg')
# cv2.rectangle(img1,(651,577),(823,710),(0,255,0),3)
box_1=img1[577:710,651:785]


#读取视频文件
vc=cv2.VideoCapture('./1.MP4')
if vc.isOpened():
    rval,frame=vc.read()
else:
    rval=False

k=0 #命名
c=1 #帧数计数

while rval:
    rval,frame=vc.read()
    # print(frame)
    if (c%4==0):#隔4帧一取
        if frame is None:
            pass
        else:
            box=frame[577:710,651:785]
            difference=cv2.subtract(box_1,box)
            # print(difference)
            if sum(difference[difference>0]) > 1000000:
                # cv2.imwrite('./photo/'+str(k)+'.jpg',frame)
                cv2.imwrite('./photo2/'+str(k)+'.jpg',box)
                k+=1
            cv2.waitKey(1)
    c+=1
vc.release()