Manual: pgmtexture

Pgmtexture User Manual(1)			   General Commands Manual			   Pgmtexture User Manual(1)

NAME
       pgmtexture - calculate textural features on a PGM image

SYNOPSIS
       pgmtexture

       [-d d]

       [pgmfile]

DESCRIPTION
       This program is part of Netpbm(1).

       pgmtexture reads a PGM image as input and calculates textural features based on spatial dependence matrices at 0, 45,
       90, and 135 degrees for a distance d (default = 1).

       Textural features include:

       •      Angular Second Moment

       •      Contrast

       •      Correlation

       •      Variance

       •      Inverse Difference Moment

       •      Sum Average

       •      Sum Variance

       •      Sum Entropy

       •      Entropy

       •      Difference Variance

       •      Difference Entropy

       •      Information Measures of Correlation

       •      Maximal Correlation Coefficient

       Algorithm  taken	 from:	Haralick, R.M., K. Shanmugam, and I. Dinstein. 1973. Textural features for image classifica‐
       tion.  IEEE Transactions on Systems, Man, and Cybertinetics, SMC-3(6):610-621.

OPTIONS
       In addition to the options common to all programs based on libnetpbm (most notably  -quiet,  see	  Common Options  ),
       pgmtexture recognizes the following command line option:

       -d distance
	      The distance.  Default is 1.

LIMITATIONS
       The method for finding the Maximal Correlation Coefficient, which requires finding the second largest eigenvalue of a
       matrix Q, does not always converge.

SEE ALSO
       pgm(1), pamsharpness(1), pamsharpmap(1), pgmedge(1), pgmminkowski(1)

AUTHOR
       Copyright (C) 1991 by Texas Agricultural Experiment Station, employer for hire of James Darrell McCauley.

DOCUMENT SOURCE
       This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The master documentation is at

	      http://netpbm.sourceforge.net/doc/pgmtexture.html

netpbm documentation				       22 August 1991				   Pgmtexture User Manual(1)