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Pgmtexture User Manual(0)			     Pgmtexture User Manual(0)

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.

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(5)	,   pamsharpness(1)  ,	pamsharpmap(1)	,  pgmedge(1)  ,  pgm‐
       minkowski(1)

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

netpbm documentation		  22 Aug 1991	     Pgmtexture User Manual(0)

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