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  classification.
       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 ), pgmtex‐
       ture 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  ma‐
       trix 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)