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

I wrote the same code in following way:

_, contours, hierarchy = cv2.findContours(img,cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_NONE)

and my code worked. I think previously it was returning 2 variables now we have to unpack into three variables. If this doesn't work try the following:

_, contours, _ = cv2.findContours(img,cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_NONE)

this should work.

For more information, you can visit the OpenCV documentation page: https://docs.opencv.org/3.1.0/d4/d73/tutorial_py_contours_begin.html

I hope this will help you.