| .TH IM_COOC_MATRIX 3 "2 Dec 1991" |
| .SH NAME |
| im_cooc_matrix, im_cooc_asm, im_cooc_contrast, im_cooc_correlation, |
| im_cooc_entropy \- calculate the co-occurrence matrix and features on it |
| .SH SYNOPSIS |
| .B #include <vips/vips.h> |
| |
| int im_cooc_matrix(im, m, xp, yp, xs, ys, dx, dy, sym) |
| .br |
| .B IMAGE *im, *m; |
| .br |
| .B int xp, yp, xs, ys; |
| .br |
| .B int dx, dy; |
| .br |
| .B int sym; |
| |
| .br |
| .B int im_cooc_asm(m, asmoment) |
| .br |
| .B IMAGE *m; |
| .br |
| .B double *asmoment; |
| |
| .br |
| .B int im_cooc_contrast(m, contrast) |
| .br |
| .B IMAGE *m; |
| .br |
| .B double *contrast; |
| |
| .br |
| .B int im_cooc_correlation(m, correlation) |
| .br |
| .B IMAGE *m; |
| .br |
| .B double *correlation; |
| |
| .br |
| .B int im_cooc_entropy(m, entropy) |
| .br |
| .B IMAGE *m; |
| .br |
| .B double *entropy; |
| |
| .SH DESCRIPTION |
| .B im_cooc_matrix() |
| creates a 256 by 256 one channel co-occurrence matrix of the box determined by |
| the parameters (xp, yp; xs, ys) within the image pointed by the IMAGE |
| descriptor im. The matrix is written onto the IMAGE descriptor m. 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 |
| co-occurrence 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. |
| |
| If flag sym is 1, the created co-occurrence matrix is symmetric that is |
| dispacement vectors (dx, dy), (-dx, -dy) create exactly the same matrix. If |
| sym is 0, the created co-occurrence matrix is not symmetric that is |
| dispacement vectors (dx, dy), (-dx, -dy) create different matrices. |
| |
| .B im_cooc_asm() |
| calculates the angular second moment of the co-occurrence matrix held by m. |
| The result is returned into the location pointed by asmoment. |
| |
| .B im_cooc_contrast() |
| calculates the contrast of the co-occurrence matrix held by m. |
| The result is returned into the location pointed by contrast. |
| |
| .B im_cooc_correlation() |
| calculates the correlation of the co-occurrence matrix held by m. |
| The result is returned into the location pointed by correlation. |
| |
| .B im_cooc_entropy() |
| calculates the entropy of the co-occurrence matrix held by m. |
| The result is returned into the location pointed by entropy. |
| .SH RETURNED VALUES |
| All functions returns 0 on success and -1 on error. |
| .SH SEE\ ALSO |
| im_glds_matrix(3) |
| .SH COPYRIGHT |
| .br |
| N. Dessipris |
| .SH AUTHOR |
| N. Dessipris \- 2/12/1991 |
