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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:

       o      Angular Second Moment

       o      Contrast

       o      Correlation

       o      Variance

       o      Inverse Difference Moment

       o      Sum Average

       o      Sum Variance

       o      Sum Entropy

       o      Entropy

       o      Difference Variance

       o      Difference Entropy

       o      Information Measures of Correlation

       o      Maximal Correlation Coefficient

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

LIMITATIONS
       The program can run incredibly slow for large images (larger than 64  x	64)  and  command
       line  options  are  limited.   The method for finding the Maximal Correlation Coefficient,
       which requires finding the second largest eigenvalue of a matrix Q, does not  always  con-
       verge.

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.

netpbm documentation			   22 Aug 1991			Pgmtexture User Manual(0)
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