http://answers.opencv.org/question/40329/python-valueerror-too-many-values-to-unpack/

I bet you are using the current OpenCV's master branch: here the return statements have changed, see http://docs.opencv.org/trunk/modules/imgproc/doc/structural_analysis_and_shape_descriptors.html?highlight=cv2.findcontours#cv2.findContours.

Thus, change the correspinding line to:

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

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