79 lines
2.2 KiB
Groff
79 lines
2.2 KiB
Groff
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.TH IM_SGLDS_MATRIX 3 "10 May 1991"
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.SH NAME
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im_glds_matrix, im_glds_asm, im_glds_contrast, im_glds_mean, im_glds_entropy \- calculate the spatial grey level difference matrix and features on it
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.SH SYNOPSIS
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.B #include <vips/vips.h>
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int im_glds_matrix(im, m, xp, yp, xs, ys, dx, dy)
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.br
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.B IMAGE *im, *m;
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.br
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.B int xp, yp, xs, ys;
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.br
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.B int dx, dy;
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.B int im_glds_asm(m, asmoment)
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.br
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.B IMAGE *m;
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.br
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.B double *asmoment;
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.B int im_glds_contrast(m, contrast)
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.br
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.B IMAGE *m;
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.br
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.B double *contrast;
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.B int im_glds_entropy(m, entropy)
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.br
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.B IMAGE *m;
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.br
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.B double *entropy;
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.B int im_glds_mean(m, mean)
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.br
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.B IMAGE *m;
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.br
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.B double *mean;
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.SH DESCRIPTION
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.B im_glds_matrix()
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creates a 256 by 1 one channel spatial grey level difference matrix (sglds) of
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the box determined by the parameters (xp, yp; xs, ys) within the image pointed
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by the IMAGE descriptor im. The matrix is written onto the IMAGE descriptor
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m. The displacement vector is determined by (dx, dy). The user must ensure
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that there is enough border pixels around the box within im dictated by the
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displacement vector (dx,dy) or else the program fails. im should be one-band
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unsigned char.
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All entries of the sgld matrix are double normalised to the number of pairs
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involved. This function is a direct implementation of the paper: Haralick R.
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M., Shanmugan K. and Dinstein I., 'Textural features for image
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classification', IEEE Transactions on Systems, Man, and Cybernetics, Vol.
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SMC-3, No 6, Nov. 1973, pp 610-621.
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.B im_glds_asm()
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calculates the angular second moment of the co-occurrence matrix held by m.
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The result is returned into the location pointed by asmoment.
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.B im_glds_contrast()
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calculates the contrast of the sglds matrix held by m. The result is returned
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into the location pointed by contrast.
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.B im_glds_entropy()
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calculates the entropy of the sglds matrix held by m. The result is returned
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into the location pointed by entropy.
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.B im_glds_mean()
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calculates the mean of the sglds matrix held by m. The result is returned
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into the location pointed by mean.
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.SH RETURNED VALUES
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All functions returns 0 on success and -1 on error.
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.SH SEE\ ALSO
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im_cooc_matrix(3)
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.SH COPYRIGHT
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.br
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N. Dessipris
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.SH AUTHOR
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N. Dessipris \- 10/05/1991
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