OpenCV Error: 'size.width>0 && size.height>0' in cv::imshow - Solution & Explanation

This error is caused by the 'imshow' function in OpenCV. It occurs when the width and height of the image being displayed are either zero or negative. To fix this error, you need to make sure that the image size is valid and greater than zero. You can check the size of the image using the 'shape' attribute of the NumPy array, and make sure it is not empty or negative.