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Block-Matching-Based Implementation of Affine Motion Estimation for HEVC
Chihiro TSUTAKE Toshiyuki YOSHIDA
IEICE TRANSACTIONS on Information and Systems
Publication Date: 2018/04/01
Online ISSN: 1745-1361
Type of Manuscript: PAPER
Category: Image Processing and Video Processing
H.265/HEVC, affine motion estimation/compensation, block matching, coding efficiency, computation cost,
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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.