vhmed(1)

PROGRAM
vhmed - Perform median filtering on an image using a histogram to find the median.

SYNTAX

vhmed

-i  input image filename

-o  output image filename

-w  window width argument

-h  window height argument

[-V]
    Gives the version for vhmed

[-U]
    Gives the usage for vhmed

[-P]
    Prompts for command line options

[-A [file1]]
    Creates the answer file called vhmed.ans or file1

[-a [file1]]
    Uses vhmed.ans or file1 as the answer file

DESCRIPTION
vhmed computes a two dimensional median filter of width w and height h over the given image. The median is computed by moving a w by h pixel mask over the image and updating the histogram of the mask.

Images must be of data storage type byte.

In rectangular odd windows (masks) the median value is replaced in the center pixel location of the window. The default window size is 3x3.

The width or height of a window cannot be an even number.

REQUIRED ARGUMENTS

-i  type: infile
    desc: input image filename

-o  type: outfile
    desc: output image filename

-w  type: integer
    desc: window width argument

-h  type: integer
    desc: window height argument

OPTIONAL ARGUMENTS
none

EXAMPLES
vhmed -i input.image -o output.image -w 3 -h 3

This command performs median filtering of width 3 and height 3 on input.image and stores the result in output.image.

SEE ALSO
intro(1), verror(3), vgparms(3), vutils(3), lvhmed(3) vqmed(1)

RESTRICTIONS
vhmed does not support even window dimensions and only works on data storage type byte.

COPYRIGHT
Copyright 1991, University of New Mexico. All rights reserved.