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 estimation 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:

See Also

attributes(5)