Pgmtexture User Manual

Section: Misc. Reference Manual Pages (0)
Updated: 22 Aug 1991
Index Return to Main Contents

 

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.


 

Index

NAME
SYNOPSIS
DESCRIPTION
LIMITATIONS
SEE ALSO
AUTHOR

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