cv2.findContours fix

[sumanmichael]

in the 135 line
changed this

_, contours, hierarchy = cv2.findContours(work, cv2.RETR_CCOMP, cv2.CHAIN_APPROX_NONE)

to this

contours, hierarchy = cv2.findContours(work, cv2.RETR_CCOMP, cv2.CHAIN_APPROX_NONE)

it's because in a previous version of opencv that function used to return 3 values, now it returns just 2 values

[yuxi-liu-wired]

This version is back-compatible :

def get_contours(img):
    work = threshold(img)
    debug_show('threshold', work)
    contours_result = cv2.findContours(work, cv2.RETR_CCOMP, cv2.CHAIN_APPROX_NONE)
    if len(contours_result) == 3:
        _, contours, hierarchy = contours_result
    else:
        contours, hierarchy = contours_result
        
    return contours, hierarchy