HandGesture Detection

Question

When I run this:

contours,_,hierarchy = cv2.findContours(thresh.copy(),cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)

I get this error:

Answer 1

cv2.findContours() return two values and cannot be unpacked to contours, hierarchy and _

It should be like this：

contours, hierarchy = cv2.findContours(thresh.copy(),cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)

or more：

a, b, *others = [1, 2, 3, 4]

Answer 2

This is a difference between OpenCV 3.x and 4.x. In 3.x there were three return values, in 4.x there are only two. As the others mentioned, you only catch contours and hierarchy:

contours, hierarchy = cv2.findContours(thresh.copy(),cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)

Alternatively, you can downgrade your OpenCV version, if what you actually want is to use 3.x.