ValueError: too many values to unpack (expected 2), when you use "cv2.findContours"

check this tip!

before (error)
contours, _ = cv2.findContours(***, ***, ***)


after (solved)
_, contours, _ = cv2.findContours(***, ***, ***)

Contour compare using OpenCV(source code), cvFindContours, cvMatchShapes

There is shape match function in the OpenCV.
The function name is cvMatchShapes.
This function compares two contours.
If two contours is same, the function returns 0.
conversely, the value of return is larger, more shape different.
So, we use threshold to decide these pair is similar or not.

 

code start

code end

#findcontour, #contour, #compare


source coude