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Amiga Format AFCD22 (Jan 1998, Issue 106).iso
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pgmtexture.man
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pgmtexture(1) AMIGA (22 Aug 1991) pgmtexture(1)
NAME
pgmtexture - calculate textural features on a portable
graymap
SYNOPSIS
pgmtexture [-d d] [pgmfile]
DESCRIPTION
Reads a portable graymap as input. Calculates textural
features based on spatial dependence matrices at 0, 45, 90,
and 135 degrees for a distance 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.
BUGS
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.
REFERENCES
IEEE Transactions on Systems, Man, and Cybertinetics, SMC-
3(6):610-621.
SEE ALSO
pgm(5), pnmcut(1)
AUTHOR
Copyright (C) 1991 by Texas Agricultural Experiment Station,
employer for hire of James Darrell McCauley.
Page 1 (printed 3/1/94)