# pgmtexture man page

pgmtexture — calculate textural features on a PGM image

## Synopsis

**pgmtexture**

`[`

**-d** *d*]

`[`

*pgmfile*]

## Description

**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/pgmte…