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 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.

DOCUMENT SOURCE¶

This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master documentation is at

http://netpbm.sourceforge.net/doc/pgmtexture.html