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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  classi-
       fication.  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 lim-
       ited.  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)