Block-Matching-Based Implementation of Affine Motion Estimation for HEVC

Chihiro TSUTAKE  Toshiyuki YOSHIDA  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E101-D   No.4   pp.1151-1158
Publication Date: 2018/04/01
Publicized: 2018/01/15
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2017EDP7201
Type of Manuscript: PAPER
Category: Image Processing and Video Processing
Keyword: 
H.265/HEVC,  affine motion estimation/compensation,  block matching,  coding efficiency,  computation cost,  

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Summary: 
Many of affine motion compensation techniques proposed thus far employ least-square-based techniques in estimating affine parameters, which requires a hardware structure different from conventional block-matching-based one. This paper proposes a new affine motion estimation/compensation framework friendly to block-matching-based parameter estimation, and applies it to an HEVC encoder to demonstrate its coding efficiency and computation cost. To avoid a nest of search loops, a new affine motion model is first introduced by decomposing the conventional 4-parameter affine model into two 3-parameter ones. Then, a block-matching-based fast parameter estimation technique is proposed for the models. The experimental results given in this paper show that our approach is advantageous over conventional techniques.