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RedHat 9 (Linux i386) - man page for pgmtexture (redhat section 1)

pgmtexture(1)			     General Commands Manual			    pgmtexture(1)

NAME
       pgmtexture - calculate textural features on a portable graymap

SYNOPSIS
       pgmtexture [-d d] [pgmfile]

DESCRIPTION
       Reads  a  portable graymap as input.  Calculates textural features based on spatial depen-
       dence matrices at 0, 45, 90, and 135 degrees for a distance d  (default	=  1).	 Textural
       features include:

	      (1) Angular Second Moment,
	      (2) Contrast,
	      (3) Correlation,
	      (4) Variance,
	      (5) Inverse Difference Moment,
	      (6) Sum Average,
	      (7) Sum Variance,
	      (8) Sum Entropy,
	      (9) Entropy,
	      (10) Difference Variance,
	      (11) Difference Entropy,
	      (12, 13) Information Measures of Correlation, and
	      (14) Maximal Correlation Coefficient.

       Algorithm taken from:
       Haralick, R.M., K. Shanmugam, and I. Dinstein. 1973. Textural features for image classifi-
       cation.	IEEE Transactions on Systems, Man, and Cybertinetics, SMC-3(6):610-621.

BUGS
       The program can run incredibly slow for large images (larger than 64  x	64)  and  command
       line  options  are  limited.   The method for finding (14) the maximal correlation coeffi-
       cient, which requires finding the second largest eigenvalue of a matrix Q, does not always
       converge.

REFERENCES
       IEEE Transactions on Systems, Man, and Cybertinetics, SMC-3(6):610-621.

SEE ALSO
       pgm(5), pnmcut(1)

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

					   22 Aug 1991				    pgmtexture(1)


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