拡張テンプレート複数併用法と探索区域予測を組み合わせるH.264対応の高効率動き検出法(画像符号化,通信・ストリーム技術,一般)  [in Japanese] Efficient Motion Estimation using Multiple Extended Templates and search area prediction for H.264/AVC  [in Japanese]

Access this Article

Search this Article

Author(s)

Abstract

動画像符号化規格H.264/AVCは従来のMPEG-2に比べ高画質化,高圧縮化に成功しているものの,処理量は膨大になっている.その元凶である動き検出処理に対しては,すでに様々な演算量低減手法が提案されてきた.筆者らも拡張テンプレート複数併用(MET)する階層型動き探索法を提案しMPEG-2において全探索並みの精度で大幅な演算量の低減が可能であることを示してきた.本稿では,そのMETに探索区域予測を組み合わせ,その予測ベクトルとの一致状況を基に二次探索部の再探索を省略したり,探索範囲を制限したりすることで,探索効率と探索精度向上を両立する新たなMETを提案した.また,これをH.264/AVCのソフトウェアエンコーダに実装しその性能評価を行い,既存のEPZSに対し,画質の低下なく2倍程度の高速化が実現できることを示した.

The video coding standard H.264/AVC succeeds in providing both high quality and high compression efficiency with the widely used MPEG-2, but it requires large amount of computational power mainly consumed motion estimation. Many method has been proposed for the motion estimation. We also proposed a new method using Multiple Expanded Templates (MET) based on the hierarchical motion search with both high speed motion estimation capability and search accuracy quality as well as Full Search for MPEG-2. In this paper, we here proposed the new MET algorithm that uses a search area prediction, which provide more efficient motion search with high accuracy quality by limiting a search area when the MET motion vector is similar to the median predictor. We also implemented this method to a software encoder of H.264/AVC, and evaluated it by using several test sequencies. As a result, it is shown that proposed method is about 2 times faster than EPZS in spite of no degradation of the video quality.

Journal

  • ITE Technical Report

    ITE Technical Report 32.56(0), 71-76, 2008

    The Institute of Image Information and Television Engineers

References:  5

Codes

  • NII Article ID (NAID)
    110007385611
  • NII NACSIS-CAT ID (NCID)
    AN1059086X
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    1342-6893
  • NDL Article ID
    9780472
  • NDL Source Classification
    ZN33(科学技術--電気工学・電気機械工業--電子工学・電気通信)
  • NDL Call No.
    Z16-1010
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
Page Top