41 lines
1.3 KiB
Groff
41 lines
1.3 KiB
Groff
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.TH IM_DIF_STD 3 "10 May 1991"
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.SH NAME
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im_dif_std \- calculate the mean and the standard deviation of the difference image for a given displacement vector
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.SH SYNOPSIS
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.B #include <vips/vips.h>
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int im_dif_std(im, xp, yp, xs, ys, dx, dy, mean, std)
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.br
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.B IMAGE *im;
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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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.br
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.B double *mean, *std;
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.SH DESCRIPTION
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.B im_dif_std()
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calculates the mean and the standard deviation of the difference image
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created by the displacement vector (dx,dy) on the box (xp,yp;xs,ys) defined
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on the image pointed by im. More specifically the difference image is
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of an image given the dispacement vector (dx, dy) is defined as follows:
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For each point of the original image, the start of the vector (dx,dy) is
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set on that point. The difference image at this point is defined as the
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difference of the values pointed by the vector (end value - start value).
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The function returns the mean and the standard deviation of the
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difference images measured on the area (xp,yp;xs,ys) of im.
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Input im should be one band unsigned char image and it should
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have been set by a call to im_mmapin(3) or im_setbuf(3).
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.SH RETURNED VALUES(3)
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The function returns 0 on success and -1 on error.
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.SH SEE\ ALSO
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im_cooc_matrix(3), im_glds_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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