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Method and apparatus for sub-pixel motion estimation which reduces bit precision

A motion estimation, sub-pixel technology, applied in the direction of image communication, television, transmission of television signals through single/parallel channels, etc., can solve problems such as multi-time, large encoder load, etc.

Inactive Publication Date: 2005-12-14
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the hardware of the motion estimation unit accounts for 70% of the hardware of the entire encoder, a large load is imposed on the encoder
Also, since motion estimation is performed for half-pixels and quarter-pixels, ie, sub-pixels, it takes more time than conventional motion estimation

Method used

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  • Method and apparatus for sub-pixel motion estimation which reduces bit precision
  • Method and apparatus for sub-pixel motion estimation which reduces bit precision
  • Method and apparatus for sub-pixel motion estimation which reduces bit precision

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Embodiment Construction

[0023] figure 1 is a diagram for explaining integer-pixel motion estimation.

[0024] Referring to the previous frame, in order to estimate the degree of motion of the block 110 of a predetermined size to be searched in the current frame, that is, the degree of motion of the macroblock, the search area 120 is selected from the previous frame, and a block 120 of the same size as the block 110 is selected. Blocks are moved in the search area 120 based on pixels, and pixel values ​​of the block 110 and blocks in the search area 120 are compared, and thus, a block most similar to the block 110 is searched for in a previous frame. To search for a block most similar to the block 110, for example, a block having the smallest SAD from the block 110 is determined as the most similar block, and pixels corresponding to the determined block are determined to be integer pixels obtained through integer pixel motion estimation.

[0025] Thereafter, motion estimation is also performed on hal...

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Abstract

Provided is a method and apparatus for sub-pixel motion estimation, which performs sub-pixel motion estimation, wherein the accuracy of the difference between the pixel value of the block being searched and the pixel value of the block of the search area, that is, the difference digits, are reduced. The method for sub-pixel motion estimation in inter-frame prediction includes: (a) determining an integer pixel corresponding to the estimated block by performing integer pixel motion estimation; (b) receiving sub-pixels adjacent to the determined integer pixel The value of the pixel and the value of the integer pixel of the block to be searched; (c) reduce the difference between the value of the sub-pixel and the value of the integer pixel and reduce the bit precision of the difference; and (d) use the value whose bit precision is reduced The difference calculates the similarity.

Description

[0001] This application claims priority to Korean Patent Application No. 10-2004-0042916 filed with the Korean Intellectual Property Office on Jun. 11, 2004, the disclosure of which is hereby incorporated by reference. technical field [0002] Apparatuses and methods consistent with the present invention relate to motion estimation in inter prediction, and more particularly to sub-pixel motion estimation, wherein the difference between the pixel values ​​of the block being searched and the pixel values ​​of the blocks in the search area Precision, that is, the number of bits of difference, is reduced. Background technique [0003] When compared with video encoded according to conventional encoding methods, video encoded according to the video encoding standard H.264 is compressed at a higher rate and has good quality. This is because motion estimation in H.264 is performed by sequentially performing integer-pixel motion estimat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/32H04N7/12H04N7/26H04N7/30
CPCH04N19/51H04N19/184H04N19/523
Inventor 朴灿植李在宪李男淑
Owner SAMSUNG ELECTRONICS CO LTD