Error is using opencv with python

Question

I have this code for finding contour in opencv with python

im = cv2.imread('test.jpg')
imgray = cv2.cvtColor(im,cv2.COLOR_BGR2GRAY)
ret,thresh = cv2.threshold(imgray,127,255,0)
image, contours, hierarchy = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)

When I try to run this I am getting an error saying

"ValueError: need more than two values to unpack"

Any help is appreciated.

ZdaR · Accepted Answer · 2015-12-23 07:54:44Z

1

Actually there is some documentation mismatch of cv2.findcontours() method, it simple returns 2 values: contours, hierarchy, so you should replace the last line with :

contours, hierarchy = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)

answered Dec 23, 2015 at 7:54

ZdaR

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