OpenCV python: ValueError: too many values to unpack

莫晓沙

我正在写一个opencv程序，我找到了另一个stackoverflow有问题的脚本，链接如下：
https://stackoverflow.com/questions/14752006/computer-vision-masking-a-human-hand/14756351#14756351
运行脚本的时候却发现报错了

1. Traceback (most recent call last):
   
2.     File "skinimagecontour.py", line 13, in <module>
   
3.     contours, _ = cv2.findContours(skin_ycrcb, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
   
4. ValueError: too many values to unpack

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直接上代码

1. import sys
   
2. import numpy
   
3. import cv2
   
4. 
   
5. im = cv2.imread('Photos/test.jpg')
   
6. im_ycrcb = cv2.cvtColor(im, cv2.COLOR_BGR2YCR_CB)
   
7. 
   
8. skin_ycrcb_mint = numpy.array((0, 133, 77))
   
9. skin_ycrcb_maxt = numpy.array((255, 173, 127))
   
10. skin_ycrcb = cv2.inRange(im_ycrcb, skin_ycrcb_mint, skin_ycrcb_maxt)
    
11. cv2.imwrite('Photos/output2.jpg', skin_ycrcb) # Second image
    
12. 
    
13. contours, _ = cv2.findContours(skin_ycrcb, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
    
14. for i, c in enumerate(contours):
    
15.     area = cv2.contourArea(c)
    
16.     if area > 1000:
    
17.         cv2.drawContours(im, contours, i, (255, 0, 0), 3)
    
18. cv2.imwrite('Photos/output3.jpg', im)

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这是咋回事啊

AI的世界

在opencv堆栈交换站点有答案
Opencv的主分支的返回语句已经改了：
http://docs.opencv.org/modules/i ... light=findcontours.
因此对应的行应该改为：

1. _, contours, _= cv2.findContours(skin_ycrcb, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

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