我写下了一段显示错误的代码，但我没有得到它：请帮助：
它的显示垫不是数字元组：
import cv
import cv2
capture = cv2.VideoCapture("j.3gp")
while(1):
_, frame1 = capture.read()
grayImage1 = cv2.cvtColor(frame1, cv2.COLOR_BGR2GRAY)
_, frame2 = capture.read()
grayImage2 = cv2.cvtColor(frame2, cv2.COLOR_BGR2GRAY)
differenceImage = cv2.absdiff(grayImage1,grayImage2)
thresholdImage = cv2.threshold(differenceImage,25,255,cv2.THRESH_BINARY)
cv2.imshow("Difference Image", differenceImage)
cv2.imshow("threshold Image", thresholdImage)
cv2.imshow("Image", frame1)
k = cv2.waitKey(30) & 0xff
Error arising :
-----------------------------------------------------------------------------------------
Traceback (most recent call last):
File "Desk.py", line 15, in <module>
cv2.imshow("threshold Image", thresholdImage)
TypeError: mat is not a numerical tuple
我自己得到了答案：cv2.threshold返回两个值并在开始处添加一个额外的变量可以纠正错误，如下所示，就像我在capture.read()
thresholdImage = cv2.threshold(differenceImage,25,255,cv2.THRESH_BINARY)
应该：
_ ,thresholdImage = cv2.threshold(differenceImage,25,255,cv2.THRESH_BINARY)
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