region_of_interest() fillpoly

[Abhishek-EE]

Hello,

So while I was trying to work through this assignment I came across a weird issue, when I am trying to run the region_of_interest() function it is giving me an error message that is

error Traceback (most recent call last)
in
7
8 vertices = np.array([[0,0],[300,450],[530,230]],dtype=np.int32)
----> 9 img = region_of_interest(img,vertices)
10 img = gaussian_blur(img,3)
11

in region_of_interest(img, vertices)
39 #filling pixels inside the polygon defined by "vertices" with the fill color
40
---> 41 cv2.fillPoly(mask, vertices, ignore_mask_color)
42
43 #returning the image only where mask pixels are nonzero

error: OpenCV(4.1.2) C:\projects\opencv-python\opencv\modules\imgproc\src\drawing.cpp:2403: error: (-215:Assertion failed) p.checkVector(2, CV_32S) >= 0 in function 'cv::fillPoly'

Initially I thought the issue is because of the datatype and not using correct datatype but as you can see that even after using the numpy int32 the issue still remains.

[Abhishek-EE]

Ok I figured it out, it was my mistake, the input vertices array to the fillpoly function is a 3-Dimension array and not 2-D array which I was using so by adding an extra bracket to the np.array function solves the probelm