OpenCV 3.1 drawContours '(-215) npoints > 0'

Question

I\'m trying to create a mask from a contour, but am getting a C++ error.

Using OS X Yosemite, Python 2.7.10, OpenCV 3.1.0.

def create_mask(img, cnt):
            


        

Answer 1

If you just use this, it will work...

ctr = np.array(cnt).reshape((-1,1,2)).astype(np.int32)
cv2.drawContours(mask, [ctr], -1, 255, -1)