mlib_ImageAutoCorrel - auto-correlation of an image
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#include <mlib.h>
mlib_status mlib_ImageAutoCorrel(mlib_d64 *correl, const mlib_image *img,
mlib_s32 dx, mlib_s32 dy);
The mlib_ImageAutoCorrel() function computes the auto-correlation of an image, given an offset.
It uses the following equation:
1 w-dx-1 h-dy-1
correl[i] = -------------- * SUM SUM (img[x][y][i] * img[x+dx][y+dy][i])
(w-dx)*(h-dy) x=0 y=0
where w and h are the width and height of the image, respectively.
The function takes the following arguments:
Pointer to auto-correlation array where size is equal to the number of channels. correl[i] contains the auto-correlation of channel i.
Pointer to image.
Displacement in the X direction.
Displacement in the Y direction.
The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.
See attributes(5) for descriptions of the following attributes:
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mlib_ImageAutoCorrel_Fp(3MLIB), mlib_ImageCrossCorrel(3MLIB), mlib_ImageCrossCorrel_Fp(3MLIB), attributes(5)