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 ⟨index.html#commonoptions⟩ ), 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