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Pgmmedian User Manual

pgmmedian

Updated: 28 August 2005

Table Of Contents

NAME

pgmmedian - apply a median filter to a PGM file

SYNOPSIS

pgmmedian [-width=n] [-height=n] [-type=median_type] [-cutoff=int] [pnmfile]

Minimum unique abbreviation of option is acceptable. You may use double hyphens instead of single hyphen to denote options. You may use white space in place of the equals sign to separate an option name from its value.

DESCRIPTION

This program is part of Netpbm.

pgmmedian applies a median filter to a PGM image, using either the histogram sort or select kth value method to determine the median.

See the -type and -cutoff options for information on how pgmmedian chooses between the two methods.

OPTIONS

-cutoff int
This option provides the cutoff value that pgmmedian uses to decide between using the histogram sort or select kth value method to find the median. If (maxval / ((width * height) - 1)), where maxval is the maxval of the image and width and height are the dimensions of the mask, is less than the cutoff value, pgmmedian uses histogram sort. Otherwise, it uses kth value.

If expression is less than the cutoff, pgmmedian uses the histogram sort. Otherwise it uses the select kth value method.

This option has no effect if you specify -type.

The default is 250

-width=n
Width of the median mask to apply.

Default is 3.

-height=n
Height of the median mask to apply.

Default is 3.

-type median_type
This option selects which method to use to find median regardless of cutoff value. Choices are histogram_sort and select.

By default, pgmmedian decides which method to use as described under the -cutoff option.

REFERENCES

  • "Collected Algorithms from ACM" Volume II, Algorithm 489 by Robert W. Floyd
  • "A Fast Two-Dimensional Median Filtering Algorithm" in "IEEE Transactions on Acoustics, Speech, and Signal Processing" Vol. ASSP-27, No. 1, February 1979
  • "Digital Image Processing Algorithms" by Ioannis Pitas, Prentice Hall, 1993 ISBN 0-13-145814-0

SEE ALSO

pgmnoise, pamaddnoise, pgm

HISTORY

pgmmedian was added to Netpbm in Version 10.29 (August 2005). It had been distributed by Mike Burns via his own web site before that (and continued to be so).

AUTHOR

Copyright (C) 1996 by Mike Burns <burns@cac.psu.edu>

Table Of Contents


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