Pgmtexture User Manual(0)

NAME
pgmtexture - calculate textural features on a PGM image

SYNOPSIS
pgmtexture [-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 ALSO
pgm(5) , pamsharpness(1) , pamsharpmap(1) , pgmedge(1) , pgmminkowski(1)

AUTHOR
Copyright (C) 1991 by Texas Agricultural Experiment Station, employer for hire of James Darrell McCauley.