1IM_DIF_STD(3)              Library Functions Manual              IM_DIF_STD(3)
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NAME

6       im_dif_std  - calculate the mean and the standard deviation of the dif‐
7       ference image for a given displacement vector
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SYNOPSIS

10       #include <vips/vips.h>
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12       int im_dif_std(im, xp, yp, xs, ys, dx, dy, mean, std)
13       IMAGE *im;
14       int xp, yp, xs, ys;
15       int dx, dy;
16       double *mean, *std;
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DESCRIPTION

20       im_dif_std() calculates the mean and the standard deviation of the dif‐
21       ference  image  created  by  the displacement vector (dx,dy) on the box
22       (xp,yp;xs,ys) defined on the image pointed by  im.   More  specifically
23       the  difference  image is of an image given the dispacement vector (dx,
24       dy) is defined as follows: For each point of the  original  image,  the
25       start  of the vector (dx,dy) is set on that point. The difference image
26       at this point is defined as the difference of the values pointed by the
27       vector  (end  value  - start value).  The function returns the mean and
28       the standard deviation of the difference images measured  on  the  area
29       (xp,yp;xs,ys) of im.
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31       Input im should be one band unsigned char image and it should have been
32       set by a call to im_mmapin(3) or im_setbuf(3).
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RETURNED VALUES(3)

36       The function returns 0 on success and -1 on error.
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SEE ALSO

39       im_cooc_matrix(3), im_glds_matrix(3)
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42       N. Dessipris
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AUTHOR

45       N. Dessipris - 10/05/1991
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49                                  10 May 1991                    IM_DIF_STD(3)
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