Pgmtexture User Manual(0) Pgmtexture User Manual(0)

pgmtexture - calculate textural features on a PGM image


[-d d]


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.

22 Aug 1991 netpbm documentation