HandGesture Detection

When I run this: contours,_,hierarchy = cv2.findContours(thresh.copy(),cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE) I get this error: ValueError: not enough values to unpack (expected 3,

Solution 1:

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.

Solution 2:

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]