JP2015159588A - ビデオ符号化またはビデオ復号化のための動きベクトル決定方法及びその装置 - Google Patents
ビデオ符号化またはビデオ復号化のための動きベクトル決定方法及びその装置 Download PDFInfo
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Abstract
Description
そ れにより、映像データ復号化部230は、予測単位別に動き補償を行った結果、予測単位別に復元し、復元予測単位を含む現在映像を復元することができる。それにより、映像が復元されることにより、映像シーケンスを含むビデオが復元される。また、復元された予測単位及び復元された映像は、他の予測単位及び映像の参照対象になりうる。
=max(MinTransformSize,RootTuSize/(2^MaxTransformSizeIndex)) (1)
現在符号化単位で可能な最小変換単位サイズ「CurrMinTuSize」と比較し、変換単位分割情報が0である場合の変換単位サイズである「RootTuSize」は、システム上採択可能な最大変換単位サイズを示すことができる。すなわち、数式(1)によれば、「RootTuSize/(2^MaxTransformSizeIndex)」は、変換単位分割情報が0である場合の変換単位サイズで「RootTuSize」を最大変換単位分割情報に相応する回数ほど分割した変換単位サイズであり、「MinTransformSize」は、最小変換単位サイズであるので、それらのうち小さい値が、現在現在符号化単位で可能な最小変換単位サイズ「CurrMinTuSize」でもある。
すなわち、現在予測モードがインターモードであるならば、変換単位分割情報が0である場合の変換単位サイズである「RootTuSize」は、最大変換単位サイズ及び現在予測単位サイズのうち小さい値に設定される。
すなわち、現在予測モードがイントラモードであるならば、変換単位分割情報が0である場合の変換単位サイズである「RootTuSize」は、最大変換単位サイズ及び現在パーティション単位サイズのうち小さい値に設定される。
Claims (4)
- インター予測のための動きベクトル決定方法において、
現在ブロックの動きベクトルを予測するために参照される複数の候補ブロックのうち前記現在ブロックに空間的に隣接する候補ブロックの参照映像が前記現在ブロックの参照映像と同一映像であるかを決定する段階と、
前記候補ブロックの参照映像が前記現在ブロックの参照映像と同一映像でない場合、前記候補ブロックの参照映像と前記現在ブロックの参照映像がそれぞれロングターム参照映像であるかを決定する段階と、
前記候補ブロックの参照映像及び前記現在ブロックの参照映像が両方ロングターム参照映像である場合、前記候補ブロックの動きベクトルをスケーリングせずに空間的動きベクトル予測候補と決定する段階と、
前記現在ブロックの参照映像及び前記候補ブロックの参照映像が互いに異なるショートターム参照映像である場合、前記候補ブロックの動きベクトルをスケーリングして前記空間的動きベクトル予測候補と決定する段階と、
前記空間的動きベクトル予測候補を含む動きベクトル予測候補のうち前記現在ブロックの動きベクトル予測を決定し、前記動きベクトル予測を用いて前記現在ブロックの動きベクトルを生成する段階と、
を含むことを特徴とする動きベクトル決定方法。 - 前記動きベクトル決定方法は、
前記現在ブロックの参照映像及び前記候補ブロックの参照映像のうち一つが前記ショートターム参照映像であり、残りの一つが前記ロングターム参照映像である場合、動きベクトル予測候補リストで前記候補ブロックの動きベクトルを利用しないように決定する段階、
をさらに含むことを特徴とする請求項1に記載の動きベクトル決定方法。 - 前記現在ブロックの参照映像及び前記候補ブロックの参照映像のうち一つが前記ショートターム参照映像であり、残りの一つが前記ロングターム参照映像である場合、前記候補ブロックによる動きベクトル予測候補を0と決定する段階、
をさらに含むことを特徴とする請求項1に記載の動きベクトル決定方法。 - インター予測のための動きベクトル決定装置において、
現在ブロックの動きベクトルを予測するために参照される複数の候補ブロックのうち前記現在ブロックに空間的に隣接する候補ブロックの参照映像が前記現在ブロックの参照映像と同一映像であるかを決定し、前記候補ブロックの参照映像が前記現在ブロックの参照映像と同一映像でない場合、前記候補ブロックの参照映像と前記現在ブロックの参照映像がそれぞれロングターム参照映像であるかを決定する参照映像比較部と、
前記候補ブロックの参照映像及び前記現在ブロックの参照映像が両方ロングターム参照映像である場合、前記候補ブロックの動きベクトルをスケーリングせずに空間的動きベクトル予測候補と決定し、前記現在ブロックの参照映像及び前記候補ブロックの参照映像が互いに異なるショートターム参照映像である場合、前記候補ブロックの動きベクトルをスケーリングして前記空間的動きベクトル予測候補と決定し、前記空間的動きベクトル予測候補を含む動きベクトル予測候補のうち前記現在ブロックの動きベクトル予測を決定し、前記動きベクトル予測を用いて前記現在ブロックの動きベクトルを生成する動きベクトル予測部と、
を備えることを特徴とする動きベクトル決定装置。
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |