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:
o | Angular Second Moment |
o | Contrast |
o | Correlation |
o | Variance |
o | Inverse Difference Moment |
o | Sum Average |
o | Sum Variance |
o | Sum Entropy |
o | Entropy |
o | Difference Variance |
o | Difference Entropy |
o | Information Measures of Correlation |
o |
Maximal Correlation Coefficient
|
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(5) , pamsharpness(1) , pamsharpmap(1) , pgmedge(1) , pgmminkowski(1)
AUTHOR
Copyright (C) 1991 by Texas Agricultural Experiment Station, employer for hire of James Darrell McCauley.