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pgmtexture(1)               General Commands Manual              pgmtexture(1)

       pgmtexture - calculate textural features on a portable graymap

       pgmtexture [-d d] [pgmfile]

       Reads  a portable graymap as input.  Calculates textural features based
       on spatial dependence matrices at 0, 45, 90, and 135 degrees for a dis-
       tance d (default = 1).  Textural features include:

              (1) Angular Second Moment,
              (2) Contrast,
              (3) Correlation,
              (4) Variance,
              (5) Inverse Difference Moment,
              (6) Sum Average,
              (7) Sum Variance,
              (8) Sum Entropy,
              (9) Entropy,
              (10) Difference Variance,
              (11) Difference Entropy,
              (12, 13) Information Measures of Correlation, and
              (14) 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.

       The  program can run incredibly slow for large images (larger than 64 x
       64) and command line options are limited.  The method for finding  (14)
       the  maximal correlation coefficient, which requires finding the second
       largest eigenvalue of a matrix Q, does not always converge.

       IEEE Transactions on Systems, Man, and Cybertinetics, SMC-3(6):610-621.

       pgm(5), pnmcut(1)

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

                                  22 Aug 1991                    pgmtexture(1)

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