.sp
.LP
These routines are intended to define regions of an image as a function
of grey level pixel values.
.SH
SHORT DESCRIPTION OF ROUTINES
.IP "Threshold -" 20
Create a binary image by applying upper and lower thresholds to an 
input image.
.IP "Edge Closing -" 20
Take an input "boundaries" image and close the edges.
.IP "Compress GREY -" 20
Calculate automatic threshold values or compress grey levels of an image, 
producing new image with map.
.IP "Dynamic Threshold -" 20
Perform dynamic thresholding on an image.
.IP "Color Threshold -" 20
Generate a binary image by thresholding a color image.
.IP "Border Distance -" 20
Compute the distance from the boundary in a two-valued byte image.
.IP "Medial Axis Transform -" 20
Compute the medial axis transform of a BYTE binary image.
.IP "Inverse Median Axis -" 20
Compute the median axis inverse transform.
