Computes the local intensity range in a neighbourhood around each pixel in an image.
The intensity range of the pixels of a neighbourhood is computed as
R = max (x) - min (x)
where x is the value of the pixels in the neighbourhood,
The neighbourhood is defined by the domain binary mask. Elements of the mask with a non-zero value are considered part of the neighbourhood. By default a 3 by 3 matrix containing only non-zero values is used.
At the border of the image, extrapolation is used. By default symmetric
extrapolation is used, but any method supported by the padarray function
can be used.
See also: paddarray, entropyfilt, stdfilt.
Package: image