NAME
glds, glds_features - calculate the spatial grey level
difference matrix and features on it
SYNOPSIS
glds image matrix xpos ypos xsize ysize dx dy
glds_features matrix
DESCRIPTION
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.
glds_features calculates features on the spatial grey
level difference vasari image file matrix. The calculated features
are printed in the stderr.
SEE ALSO
im_glds_matrix(3X),
im_glds_asm(3X),
im_glds_contrast(3X),
im_glds_correlation(3X),
im_glds_entropy(3X).
COPYRIGHT
N. Dessipris
AUTHOR
N. Dessipris - 27/02/1992