pgmtexture
Updated: 22 Aug 1991
Table Of Contents
NAME
pgmtexture - calculate textural features on a PGM image
SYNOPSIS
pgmtexture
[-d d]
[pgmfile]
DESCRIPTION
This program is part of Netpbm.
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 method for finding the Maximal Correlation Coefficient, which requires
finding the second largest eigenvalue of a matrix Q, does not always converge.
SEE ALSO
pgm,
pamsharpness,
pamsharpmap,
pgmedge,
pgmminkowski
AUTHOR
Copyright (C) 1991 by Texas Agricultural Experiment Station, employer for
hire of James Darrell McCauley.
Table Of Contents