Midpoint FilterThe Midpoint filter blurs the image by replacing each pixel with the average of the highest pixel and the lowest pixel (with respect to intensity) within the specified windowsize.
For example, given the grayscale 3x3 pixel neighborhood;
The center pixel would be changed from 77 to 109 as it is the midpoint between the brightest pixel 219 and the darkest pixel 0 within the current window.
Midpoint = (darkest+lightest)/2
1. Select the window size of the midpoint filter
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