JP7096374B2 - カラー成分間のサブブロック動きベクトル継承 - Google Patents
カラー成分間のサブブロック動きベクトル継承 Download PDFInfo
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- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
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Description
適用特許法及び/又はパリ条約に基づく規則に基づき、本出願は、2018年6月21日に出願された国際特許出願第PCT/CN2018/092118号及び2018年11月10日に出願された国際特許出願第PCT/CN2018/114931号の優先権及び利益を適時に主張するものである。国際特許出願第PCT/CN2018/092118号、および国際特許出願第PCT/CN2018/114931号の開示全体が、本出願の開示の一部として参照援用される。
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Claims (15)
- ビデオデータを処理する方法であって、
ルミナンスブロックと少なくとも1つのクロマブロックとを含むビデオの現在のビデオユニットと、前記ビデオのビットストリームとの間の変換中に、アフィンモードに基づいて、前記ルミナンスブロックの制御点の動きベクトルを決定することと、
前記ルミナンスブロックをルミナンスサブブロックに分割することと、
前記少なくとも1つのクロマブロックのクロマブロックをクロマサブブロックに分割することと、
前記制御点の動きベクトルに基づいて各ルミナンスサブブロックのルミナンス動きベクトルを決定することと、
複数の対応するルミナンスサブブロックのルミナンス動きベクトルと現在のビデオユニットのカラーフォーマットとに基づいて、各クロマサブブロックのクロマ動きベクトルを導出することと、
各ルミナンスサブブロックのルミナンス動きベクトルに基づいてルミナンスブロックを再構成することと
を含む方法。 - 各クロマサブブロックのクロマ動きベクトルを導出することは、
クロマブロックが少なくとも1つの第1のクロマグループに分割されていると決定することであって、第1のクロマグループは、現在のビデオユニットのカラーフォーマットに従って2つ又は4つのクロマサブブロックを含む、決定することと、
少なくとも1つの第1のクロマグループの各々に対してグループクロマ動きベクトルを導出することと、
前記グループクロマ動きベクトルを対応する第1のクロマグループの各サブブロックに割り当てることと
をさらに含む、請求項1に記載の方法。 - 前記グループクロマ動きベクトルは、スケーリング係数を中間動きベクトルに適用することに基づいて導出される、請求項2に記載の方法。
- 前記第1のクロマグループは、前記カラーフォーマットが4:2:2である場合には2つのクロマサブブロックを含み、前記2つのクロマサブブロックに対応する2つのルミナンスサブブロックがそれぞれ動きベクトルMV 0 およびMV 1 を有し、前記中間動きベクトルMV*は、前記MV0および前記MV1に基づいて導出される、
請求項3に記載の方法。 - 前記中間動きベクトルは、オフセットに基づく平均化演算を前記MV0及び前記MV1に適用することに基づいて導出される、請求項4に記載の方法。
- 前記中間動きベクトルはMV*=Shift(MV0+MV1,1)であり、Shift(x,1)=(x+offset)>>1であり、オフセットは0又は1であり、>>は右シフト演算を表す、請求項3ないし5いずれか一項に記載の方法。
- 前記第1のクロマグループは、前記カラーフォーマットが4:2:0である場合に、4つのクロマサブブロックを含み、4つのルミナンスサブブロックのうちの左上のルミナンスサブブロックが動きベクトルMV0を有し、前記4つのルミナンスサブブロックのうちの右上のルミナンスサブブロックが動きベクトルMV1を有し、前記4つのルミナンスサブブロックのうちの左下のルミナンスサブブロックが動きベクトルMV2を有し、前記4つのルミナンスサブブロックのうちの右下のルミナンスサブブロックが動きベクトルMV3を有し、前記4つのルミナンスサブブロックは前記4つのクロマサブブロックに対応し、前記中間動きベクトルMV*は、少なくとも前記MV0および前記MV3に基づいて導出される、請求項3に記載の方法。
- 前記中間動きベクトルが、オフセットに基づく平均化演算を少なくとも前記MV0及びMV3に適用することに基づいて導出される、請求項4ないし7いずれか一項に記載の方法。
- 前記グループクロマ動きベクトルに基づいてクロマブロックを再構成することをさらに含む、請求項2ないし8いずれか一項記載の方法。
- 前記第1のクロマグループの単位で前記クロマブロックを再構成する、請求項2ないし9いずれか一項に記載の方法。
- 前記変換は、現在のビデオユニットをビットストリームに符号化することを含む、請求項1ないし10いずれか一項に記載の方法。
- 前記変換は、前記ビットストリームから現在のビデオユニットを復号することを含む、請求項1ないし10いずれか一項に記載の方法。
- プロセッサと、命令を有する非一時メモリとを備える、ビデオデータを処理する装置であって、前記命令は、前記プロセッサにより実行されると、前記プロセッサに、
ルミナンスブロック及び少なくとも1つのクロマブロックを含むビデオの現在のビデオユニットと、前記ビデオのビットストリームとの間の変換中に、アフィンモードに基づいて、前記ルミナンスブロックの制御点の動きベクトルを決定し、
前記ルミナンスブロックをルミナンスサブブロックに分割し、
前記少なくとも1つのクロマブロックのクロマブロックをクロマサブブロックに分割し、
前記制御点の動きベクトルに基づいて各ルミナンスサブブロックのルミナンス動きベクトルを決定し、
複数の対応するルミナンスサブブロックのルミナンス動きベクトルと現在のビデオユニットのカラーフォーマットとに基づいて、各クロマサブブロックのクロマ動きベクトルを導出し、
各ルミナンスサブブロックのルミナンス動きベクトルに基づいてルミナンスブロックを再構成することと
を実行させる、装置。 - プロセッサに
ルミナンスブロック及び少なくとも1つのクロマブロックを含むビデオの現在のビデオユニットと、前記ビデオのビットストリームとの間の変換中に、アフィンモードに基づいて、前記ルミナンスブロックの制御点の動きベクトルを決定させ、
前記ルミナンスブロックをルミナンスサブブロックに分割させ、
前記少なくとも1つのクロマブロックのクロマブロックをクロマサブブロックに分割させ、
前記制御点の動きベクトルに基づいて各ルミナンスサブブロックのルミナンス動きベクトルを決定させ、
複数の対応するルミナンスサブブロックのルミナンス動きベクトルと現在のビデオユニットのカラーフォーマットとに基づいて、各クロマサブブロックのクロマ動きベクトルを導出させ、
各ルミナンスサブブロックのルミナンス動きベクトルに基づいてルミナンスブロックを再構成させる
命令を格納する非一時的なコンピュータ読取可能記憶媒体。 - ビデオのビットストリームを格納する方法であって、
ルミナンスブロック及び少なくとも1つのクロマブロックを含むビデオの現在のビデオユニットと、前記ビデオのビットストリームとの間の変換中に、アフィンモードに基づいて、前記ルミナンスブロックの制御点の動きベクトルを決定することと、
前記ルミナンスブロックをルミナンスサブブロックに分割することと、
前記少なくとも1つのクロマブロックのクロマブロックをクロマサブブロックに分割することと、
前記制御点の動きベクトルに基づいて各ルミナンスサブブロックのルミナンス動きベクトルを決定することと、
複数の対応するルミナンスサブブロックのルミナンス動きベクトルと現在のビデオユニットのカラーフォーマットとに基づいて、各クロマサブブロックのクロマ動きベクトルを導出することと、
各ルミナンスサブブロックのルミナンス動きベクトルに基づいてルミナンスブロックを再構成することと
を含む、方法。
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