## table of contents

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Pgmtexture User Manual(1) | General Commands Manual | Pgmtexture User Manual(1) |

# 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.*

# OPTIONS¶

In addition to the options common to all programs based on
libnetpbm (most notably **-quiet**, see

Common Options ), **pgmtexture** recognizes the following command line
option:

- -d
*distance* - The distance. Default is 1.

# 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

22 August 1991 | netpbm documentation |