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pgmtexture(1)									    pgmtexture(1)

       pgmtexture - calculate textural features on a portable graymap

       pgmtexture [-d d] [pgmfile]

       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.

       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

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

       pgm(5), pnmcut(1)

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

					   22 Aug 1991				    pgmtexture(1)
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