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mlib_videosumabsdiff

mlib_VideoSumAbsDiff(3MLIB)				    mediaLib Library Functions				       mlib_VideoSumAbsDiff(3MLIB)

NAME

       mlib_VideoSumAbsDiff - motion estimation

SYNOPSIS

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

       mlib_s32 mlib_VideoSumAbsDiff(mlib_u8 *curr_block, const mlib_u8 *ref_block, mlib_s32 width, mlib_s32 height, mlib_s32 stride);

DESCRIPTION

       The  mlib_VideoSumAbsDiff() function computes the sum of absolute differences between the pixels in the current block and the corresponding
       pixels in the reference block.

       Both the current block and the reference block belong to frames with the same dimension. (The stride is applicable to both.) Motion estima-
       tion  computes  the  sum of the absolute differences between the current block and reference blocks at different locations in the reference
       frame, choosing the best fit (least sum of absolute difference) to calculate the motion vector.

PARAMETERS

       The function takes the following arguments:

       curr_block      Pointer to the current block. curr_block must be 8-byte aligned.

       ref_block       Pointer to the reference block.

       width	       Width of the block.

       height	       Height of the block.

       stride	       Stride, in bytes, between adjacent rows in a block. stride must be a multiple of eight.

RETURN VALUES

       The function returns a value of type mlib_s32.

ATTRIBUTES

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

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

SEE ALSO

       attributes(5)

SunOS 5.10							    9 Nov 2004					       mlib_VideoSumAbsDiff(3MLIB)