Python-OpenCV cv2 OpenCV Error: Assertion failed (scn == 3 || scn == 4) in unknown function, file ..\..\..\modules\imgproc\src\color.cpp

Question

I am trying to learn contours in python using cv2.

I tried the following code given in a tutorial guide:

import cv2
import numpy as np
from matplotli         


        

Answer 1

I had this problem and couldn't find a solution, but on the web, it was working. My solution was almost funny - you can't have two streams. I turned off the web stream and then it was fine!