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 ), 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)