mlib_ImageAutoCorrel(3MLIB)				    mediaLib Library Functions				       mlib_ImageAutoCorrel(3MLIB)

NAME

       mlib_ImageAutoCorrel - auto-correlation of an image

SYNOPSIS

       cc [ flag... ] file... -lmlib [ library... ]
       #include <mlib.h>

       mlib_status mlib_ImageAutoCorrel(mlib_d64 *correl, const mlib_image *img, mlib_s32 dx, mlib_s32 dy);

DESCRIPTION

       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.

PARAMETERS

       The function takes the following arguments:

       correl	       Pointer	to  auto-correlation array where size is equal to the number of channels.  correl[i] contains the auto-correlation
		       of channel i.

       img	       Pointer to image.

       dx	       Displacement in the X direction.

       dy	       Displacement in the Y direction.

RETURN VALUES

       The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_ImageAutoCorrel_Fp(3MLIB), mlib_ImageCrossCorrel(3MLIB), mlib_ImageCrossCorrel_Fp(3MLIB), attributes(5)

SunOS 5.10							    10 Nov 2004 				       mlib_ImageAutoCorrel(3MLIB)