Applies a midpoint filter to an image.
In the midpoint method, the color value of each pixel is replaced with the average of maximum and minimum (i.e. the midpoint) of color values of the pixels in a surrounding region. A larger region (filter size) yields a stronger effect.
The midpoint filter is typically used to filter images containing short tailed noise such as Gaussian and uniform type noise.
Filter Size: larger filter yields stronger effect.
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