pgmtexture

Langue: en

Autres versions - même langue

Version: 22 Aug 1991 (mandriva - 22/10/07)

Section: 1 (Commandes utilisateur)

Sommaire

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(1), pamsharpness(1), pamsharpmap(1), pgmedge(1), pgmminkowski(1)

AUTHOR

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