# pgmtexture

NAME

SYNOPSIS

DESCRIPTION

BUGS

REFERENCES

SEE ALSO

AUTHOR

## 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 dependence 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 classification. *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 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 Station, employer for
hire of James Darrell McCauley.