I’m writing an opencv program and I found a script on another stackoverflow question: Computer Vision: Masking a human hand
When I run the scripted answer, I get the following error:
Traceback (most recent call last): File "skinimagecontour.py", line 13, in <module> contours, _ = cv2.findContours(skin_ycrcb, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE) ValueError: too many values to unpack
The code:
import sys import numpy import cv2 im = cv2.imread('Photos/test.jpg') im_ycrcb = cv2.cvtColor(im, cv2.COLOR_BGR2YCR_CB) skin_ycrcb_mint = numpy.array((0, 133, 77)) skin_ycrcb_maxt = numpy.array((255, 173, 127)) skin_ycrcb = cv2.inRange(im_ycrcb, skin_ycrcb_mint, skin_ycrcb_maxt) cv2.imwrite('Photos/output2.jpg', skin_ycrcb) # Second image contours, _ = cv2.findContours(skin_ycrcb, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE) for i, c in enumerate(contours): area = cv2.contourArea(c) if area > 1000: cv2.drawContours(im, contours, i, (255, 0, 0), 3) cv2.imwrite('Photos/output3.jpg', im)
Any help is appreciated!
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Answer
I got the answer from the OpenCV Stack Exchange site. Answer
THE ANSWER:
I bet you are using the current OpenCV’s master branch: here the return statements have changed, see http://docs.opencv.org/modules/imgproc/doc/structural_analysis_and_shape_descriptors.html?highlight=findcontours.
Thus, change the corresponding line to read:
_, contours, _= cv2.findContours(skin_ycrcb, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)Or: since the current trunk is still not stable and you probably will run in some more problems, you may want to use OpenCV’s current stable version 2.4.9.