Provided by: netpbm_10.0-15_amd64 bug


       pgmtexture - calculate textural features on a portable graymap


       pgmtexture [-d d] [pgmfile]


       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).
       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
       classification.  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
       coefficient, which requires finding the second largest eigenvalue of a matrix Q, does  not
       always converge.


       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)