.TH GLDS 1 "27 January 1992"
.SH NAME
glds, glds_features \- calculate the spatial grey level difference matrix and features on it
.SH SYNOPSIS
glds image matrix xpos ypos xsize ysize dx dy

glds_features matrix
.SH DESCRIPTION
.B glds
creates a 256 by 1 one channel spatial grey level difference 
matrix (sglds) of the box
determined by the parameters (xp, yp; xs, ys) within
the vasari image file image.  The matrix
is written onto the vasari image file matrix.  The displacement
vector is determined by (dx, dy).  The user must ensure that there
is enough border pixels around the box within im dictated by the displacement
vector (dx,dy) or else the program fails.
All entries of the sgld matrix are double normalised to the number
of pairs involved.  This function is a direct implementation of the paper:
Haralick R. M., Shanmugan K. and Dinstein I., 'Textural features for
image classification', IEEE Transactions on Systems, Man, and Cybernetics,
Vol. SMC-3, No 6, Nov. 1973, pp 610-621.

Input im should be one band unsigned char image file.

.B glds_features
calculates features on the spatial grey level difference vasari image
file matrix.  The calculated features are printed in the stderr.
.SH SEE\ ALSO
im_glds_matrix(3X), im_glds_asm(3X), im_glds_contrast(3X),
im_glds_correlation(3X), im_glds_entropy(3X).
.SH COPYRIGHT
N. Dessipris
.SH AUTHOR
N. Dessipris \- 27/02/1992