OpenCV Assertion failed: (-215:Assertion failed) npoints >= 0 && (depth == CV_32F || depth == CV_32S)

Question

I have found the following code on this website:

import os
import os.path
import cv2
import glob
import imutils
CAPTCHA_IMAGE_FOLDER = \"generated_captcha_im         


        

Answer 1

In OpenCV4, cv2.findContours has only 2 return values. Contours being the FIRST value

contours, _ = cv2.findContours(thresh.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

Note that I added underscore to let go of the other return value of hierarchy