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pgmtexture(1)					    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 dependence matrices at 0, 45,
       90, and 135 degrees for a distance d (default = 1).   Tex
       tural 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. Tex
       tural features for image	 classification.   IEEE	 Transac_
       tions	 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 lim
       ited.  The method for finding (14) the maximal correlation
       coefficient,  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 Sta
       tion, employer for hire of James Darrell McCauley.

			   22 Aug 1991		    pgmtexture(1)

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