pgmtexture



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  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 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.



netpbm documentation              22 Aug 1991        Pgmtexture User Manual(0)

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