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cv2.error: OpenCV(4.5.2) .error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor' in command line Code Example
error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor' 
This error happened because the image didn't load properly.
So you have a problem with the previous line cv2.imread my suggestion is :

Check if the images exist in the path you give

Check the count variable to see if it has a valid number
Source: stackoverflow.com
cv2.error: OpenCV(4.5.3) C:\Users\runneradmin\AppData\Local\Temp\pip-req-build-q3d_8t8e\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor' 
Try Giving Full Path. 
This seems to be the path issue in windows. 
I changed it to a full path like this and it worked.

filename = "D:\Sandbox\Github\opencv-project\Resources\Photos\cats.jpg"
cv2.error: OpenCV(4.5.2) .error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor' in command line 
    cv2.line(img, (int(corners_int[0, 0]), int(corners_int[0, 1])), (int(corners_int[3, 0]), int(corners_int[3, 1])), (255, 255, 0), 2)



Whatever

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