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pgmtexture(1) General Commands Manual 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 depen-
dence 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 classifi-
cation. 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 coeffi-
cient, 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.
22 Aug 1991 pgmtexture(1)
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On Apache
Under GNU General Public License
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