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). Tex
tural 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. Tex
tural features for image classification. IEEE Transac
tions 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 lim
ited. 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 Sta
tion, employer for hire of James Darrell McCauley.
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