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Nonlinear filtering using lookup tables

`J = bwlookup(I,lut)`

performs a 2-by-2 or 3-by-3 nonlinear neighborhood filtering operation on binary or
grayscale image `J`

= bwlookup(`I`

,`lut`

)`I`

and returns the results in output image
`J`

. The neighborhood processing determines an integer index value used
to access values in lookup table `lut`

. The fetched
`lut`

value becomes the pixel value in output image
`J`

at the targeted position.

You optionally can perform the filtering