等分割サブバンド符号化における動き補償フレーム間予測の周波数領域実現

DOI

書誌事項

タイトル別名
  • Frequency Domain Realization of Motion Compensated Interframe Prediction for Subband/Transform Coding

抄録

A new type of hybrid subband coding method using motion compensation (MC) is described in this paper. Energy compaction of lapped transforms and analysis/synthesis filter banks such as QMF are higher than that of Discrete Cosine Transform. However, when we combine the intraframe/MC-interframe adaptive prediction and filter banks, the problems of 1) level gaps between two successive MC blocks (caused by block matching process), and 2) level gaps between intraframe and interframe blocks should be solved. Because those level gaps contain very high frequency components, they reduce the efficiency of subband codings. Thus, we propose a hybrid coding structure, where motion estimation is carried out in the image domain, and interframe differences are taken in the frequency domain. In this method, interframe prediction and intra/inter switching can be carried out in the frequency domain. Thus, level gap problem does not appear. In addition, we show that the process of loop filtering can be carried out by only discarding high frequency band data of prediction images. By using this method, the coding efficiency of proposed MC+subband coding can be enhanced. Also, an adaptive loop filtering can be performed by varying the number of bands to be used for interframe prediction.

収録刊行物

詳細情報 詳細情報について

  • CRID
    1390282679497144320
  • NII論文ID
    110003707247
  • DOI
    10.11485/tvtr.15.70_9
  • ISSN
    24330914
    03864227
  • 本文言語コード
    ja
  • データソース種別
    • JaLC
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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