Pgmtexture User Manual(0) Pgmtexture User Manual(0)NAMEpgmtexture - calculate textural features on a PGM image
SYNOPSISpgmtexture
[-d d]
[pgmfile]
DESCRIPTION
This program is part of Netpbm(1)pgmtexture reads a PGM image as input and calculates textural features
based on spatial dependence matrices at 0, 45, 90, and 135 degrees for
a distance d (default = 1).
Textural features include:
· Angular Second Moment
· Contrast
· Correlation
· Variance
· Inverse Difference Moment
· Sum Average
· Sum Variance
· Sum Entropy
· Entropy
· Difference Variance
· Difference Entropy
· Information Measures of Correlation
· 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.
LIMITATIONS
The program can run incredibly slow for large images (larger than 64 x
64) and command line options are limited. The method for finding the
Maximal Correlation Coefficient, which requires finding the second
largest eigenvalue of a matrix Q, does not always converge.
SEE ALSOpgm(1) , pamsharpness(1) , pamsharpmap(1) , pgmedge(1) , pgm‐
minkowski(1)AUTHOR
Copyright (C) 1991 by Texas Agricultural Experiment Station, employer
for hire of James Darrell McCauley.
netpbm documentation 22 Aug 1991 Pgmtexture User Manual(0)