Man1 - pgmtexture.1

pgmtexture - calculate textural features on a PGM image

pgmtexture

[*-d* /d/]

[/pgmfile/]

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.

The method for finding the Maximal Correlation Coefficient, which requires finding the second largest eigenvalue of a matrix Q, does not always converge.

*pgm*(5) , *pamsharpness*(1) , *pamsharpmap*(1) , *pgmedge*(1) , *pgmminkowski*(1)

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