Question $4$

Now that you have segmented out the liquid from the background subtraction image, your next task is to use morphological operations to improve the mask by removing unwanted true pixels $($such as from the grid markings on the background$)$ and unwanted false pixels $($such as from the foam$).$ Answer the following question after finding a suitable method.

Question

After performing background subtraction, grayscale thresholding, and morphological operations on frame number $175,$ what is the percentage of true pixels $($corresponding to the liquid$)$ in your final mask?