1Pgmtexture User Manual(0)                            Pgmtexture User Manual(0)
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NAME

6       pgmtexture - calculate textural features on a PGM image
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SYNOPSIS

10       pgmtexture
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12       [-d d]
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14       [pgmfile]
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DESCRIPTION

18       This program is part of Netpbm(1).
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20       pgmtexture  reads a PGM image as input and calculates textural features
21       based on spatial dependence matrices at 0, 45, 90, and 135 degrees  for
22       a distance d (default = 1).
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24       Textural features include:
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28       ·      Angular Second Moment
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30       ·      Contrast
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32       ·      Correlation
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34       ·      Variance
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36       ·      Inverse Difference Moment
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38       ·      Sum Average
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40       ·      Sum Variance
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42       ·      Sum Entropy
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44       ·      Entropy
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46       ·      Difference Variance
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48       ·      Difference Entropy
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50       ·      Information Measures of Correlation
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52       ·      Maximal Correlation Coefficient
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56       Algorithm  taken  from:  Haralick, R.M., K. Shanmugam, and I. Dinstein.
57       1973. Textural features for image classification.  IEEE Transactions on
58       Systems, Man, and Cybertinetics, SMC-3(6):610-621.
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LIMITATIONS

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

69       pgm(1), pamsharpness(1), pamsharpmap(1), pgmedge(1), pgmminkowski(1)
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AUTHOR

73       Copyright (C) 1991 by Texas Agricultural Experiment  Station,  employer
74       for hire of James Darrell McCauley.
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78netpbm documentation              22 Aug 1991        Pgmtexture User Manual(0)
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