
Cantata(Subform)             Khoros              Cantata(Subform)

     2D SPATIAL DOMAIN FILTERS

     These routines filter images in the spatial domain.

     SHORT DESCRIPTION OF ROUTINES

     Median (quick sort) -
                         Perform a median filter on an image
                         using quick sort to find the median
                         value.

     Median (histogram) -
                         Perform median filtering on an image
                         using a histogram to find the median.

     Sobel -             Perform image differentiation by running
                         two NxN weighted operators on an image
                         (Sobel filter).

     Gradient -          Sharpen an image by differentiation
                         (gradient).

     DRF Edge Extract -  Difference recursive filter.  Optimal
                         filter for edge detection.

     GEF Edge Extract -  First derivative operator for symmetric
                         exponential filter.  Edge detection
                         using maxima of gradient.

     SDEF Edge Extract - Second derivative operator for symmetric
                         exponential filter.  Edge detection
                         using zero crossings of 2nd directional
                         derivative along the gradient.

     Speckle Removal -   Reduce speckle noise from an image by
                         using the Crimmins algorithm.

     2D Convolution -    Compute the two-dimensional convolution
                         of a pair of images.

                         Copyright 1992, University of New Mex-
                         ico. All rights reserved.

Khoros                    Release: 1.0                          1

