OpenCV Error: Sizes of input arguments do not match (The operation is neither 'array op array' (wher

OpenCV Error: Sizes of input arguments do not match (The operation is neither 'array op array' (where arrays have the same size and the same number of channels)

自己模拟了错误：

import numpy as np
import cv2
preFrame=np.asanyarray([1,2,3])
frame2=np.asanyarray([1,2])
diff = cv2.subtract(preFrame, frame2)
if not np.any(diff):  # 判断为图片相同
    print(True)

原因： preFrame和 frame2的shage不一样