JP2022525124A - エンコーダ、デコーダ及び対応する方法 - Google Patents
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Abstract
Description
本特許出願は、Ye-Kui Wang他により2019年3月11日に出願された「Sub-Picture Based Video Coding」という名称の米国仮特許出願第62/816,751号、及びYe-Kui Wang他により2019年3月29日に出願された「Sub-Picture Based Video Coding」という名称の米国仮特許出願第62/826,659号の優先権を主張し、これらを参照により援用する。
[技術分野]
本開示は、一般的にビデオコーディングに関し、具体的にはビデオコーディングにおいてピクチャのサブピクチャをコーディングすることに関する。
xColBr=xCb+cbWidth;
yColBr=yCb+cbHeight;
rightBoundaryPos=subpic_treated_as_pic_flag[SubPicIdx]?
SubPicRightBoundaryPos:pic_width_in_luma_samples-1;且つ
botBoundaryPos=subpic_treated_as_pic_flag[SubPicIdx]?
SubPicBotBoundaryPos:pic_height_in_luma_samples-1
ここで、xColBr及びyColBRは同一位置のブロックの位置を指定し、xCb及びyCbは現在のピクチャの左上サンプルに対する現在のブロックの左上サンプルを指定し、cbWidthは現在のブロックの幅であり、cbHeightは現在のブロックの高さであり、SubPicRightBoundaryPosはサブピクチャの右境界の位置であり、SubPicBotBoundaryPosはサブピクチャの下境界の位置であり、pic_width_in_luma_samplesはルマサンプルで測定された現在のピクチャの幅であり、pic_height_in_luma_samplesはルマサンプルで測定された現在のピクチャの高さであり、botBoundaryPosはサブピクチャの下境界の計算された位置であり、rightBoundaryPosはサブピクチャの右境界の計算された位置であり、SubPicIdxはサブピクチャのインデックスであり、yCb>>CtbLog2SizeYがyColBr>>CtbLog2SizeYに等しくないとき、同一位置の動きベクトルは除外され、CtbLog2SizeYはコーディングツリーブロックのサイズを示す。
xInti=Clip3(SubPicLeftBoundaryPos,SubPicRightBoundaryPos,xIntL+i)、且つ
yInti=Clip3(SubPicTopBoundaryPos,SubPicBotBoundaryPos,yIntL+i)
ここで、subpic_treated_as_pic_flagはサブピクチャがピクチャとして扱われることを示すために設定されるフラグであり、SubPicIdxはサブピクチャのインデックスであり、xInti及びyIntiはインデックスiにおけるクリッピングされたサンプル位置であり、SubPicRightBoundaryPosはサブピクチャの右境界の位置であり、SubPicLeftBoundaryPosはサブピクチャの左境界の位置であり、SubPicTopBoundaryPosはサブピクチャの上境界の位置であり、SubPicBotBoundaryPosはサブピクチャの下境界の位置であり、Clip3は以下に従うクリッピング機能である。
xInti=Clip3(SubPicLeftBoundaryPos,SubPicRightBoundaryPos,xIntL+i-3)、且つ
yInti=Clip3(SubPicTopBoundaryPos,SubPicBotBoundaryPos,yIntL+i-3)
ここで、subpic_treated_as_pic_flagはサブピクチャがピクチャとして扱われることを示すために設定されるフラグであり、SubPicIdxはサブピクチャのインデックスであり、xInti及びyIntiはインデックスiにおけるクリッピングされたサンプル位置であり、SubPicRightBoundaryPosはサブピクチャの右境界の位置であり、SubPicLeftBoundaryPosはサブピクチャの左境界の位置であり、SubPicTopBoundaryPosはサブピクチャの上境界の位置であり、SubPicBotBoundaryPosはサブピクチャの下境界の位置であり、Clip3は上記の通りである。
xInti=Clip3(SubPicLeftBoundaryPos/SubWidthC,SubPicRightBoundaryPos/SubWidthC,xIntC+i)、且つ
yInti=Clip3(SubPicTopBoundaryPos/SubHeightC,SubPicBotBoundaryPos/SubHeightC,yIntC+i)
ここで、subpic_treated_as_pic_flagはサブピクチャがピクチャとして扱われることを示すために設定されるフラグであり、SubPicIdxはサブピクチャのインデックスであり、xInti及びyIntiはインデックスiにおけるクリッピングされたサンプル位置であり、SubPicRightBoundaryPosはサブピクチャの右境界の位置であり、SubPicLeftBoundaryPosはサブピクチャの左境界の位置であり、SubPicTopBoundaryPosはサブピクチャの上境界の位置であり、SubPicBotBoundaryPosはサブピクチャの下境界の位置であり、SubWidthC及びSubHeightCはルマサンプルとクロマサンプルとの間の水平及び垂直サンプリングレート比を示し、Clip3は上記の通りである。
本開示は、一般的にビデオコーディングに関し、具体的にはビデオコーディングにおいてピクチャのサブピクチャをコーディングすることに関する。
Claims (20)
- デコーダにおいて実現される方法であって、
前記デコーダの受信機により、サブピクチャを含むピクチャを含むビットストリームを受信するステップと、
前記デコーダのプロセッサにより、前記ビットストリームからコーディングツリーブロック(CTB)の単位の前記サブピクチャの幅及びCTBの単位の前記サブピクチャの高さを取得するステップと、
前記プロセッサにより、前記サブピクチャの前記幅及び前記サブピクチャの前記高さに基づいて前記サブピクチャのコーディングブロックを復号するステップと
を含む方法。 - 前記プロセッサにより、前記ビットストリームからCTBの単位の前記サブピクチャのオフセットを取得するステップと、
前記プロセッサにより、前記サブピクチャの前記オフセットに基づいて、前記ピクチャに対して前記サブピクチャを位置決めするステップと
を更に含む、請求項1に記載の方法。 - 前記サブピクチャの前記オフセットは、前記サブピクチャの左上コーディングツリーユニット(CTU)の垂直位置及び前記サブピクチャの前記左上CTUの水平位置として指定される、請求項1又は2に記載の方法。
- 前記サブピクチャの前記オフセットは、前記ピクチャの左上CTUと前記サブピクチャの前記左上CTUとの間の差として更に指定される、請求項1乃至3のうちいずれか1項に記載の方法。
- 前記サブピクチャの前記左上CTUの前記垂直位置はsubpic_ctu_top_left_yとして前記ビットストリームに記憶され、前記サブピクチャの前記左上CTUの前記垂直位置はsubpic_ctu_top_left_xとして前記ビットストリームに記憶される、請求項1乃至4のうちいずれか1項に記載の方法。
- 前記サブピクチャの前記幅はsubpic_width_minus1として前記ビットストリームに記憶され、前記サブピクチャの前記高さはsubpic_height_minus1として前記ビットストリームに記憶される、請求項1乃至5のうちいずれか1項に記載の方法。
- 前記サブピクチャの前記幅、高さ及びオフセットは、前記ビットストリーム内のシーケンスパラメータセット(SPS)から取得される、請求項1乃至6のうちいずれか1項に記載の方法。
- エンコーダにおいて実現される方法であって、
前記エンコーダのプロセッサにより、ピクチャをサブピクチャに区分するステップと、
前記プロセッサにより、前記サブピクチャの幅及び前記サブピクチャの高さを決定するステップと、
前記プロセッサにより、コーディングツリーブロック(CTB)の単位で前記サブピクチャの前記幅及び前記サブピクチャの前記高さをビットストリームに符号化するステップと、
前記プロセッサにより、前記サブピクチャのコーディングブロックを前記ビットストリームに符号化するステップと、
前記プロセッサに結合されたメモリにより、デコーダに向けて通信するために前記ビットストリームを記憶するステップと
を含む方法。 - 前記プロセッサにより、CTBの単位で前記サブピクチャのオフセットを決定するステップと、
前記プロセッサにより、CTBの単位で前記サブピクチャの前記オフセットを前記ビットストリームに符号化するステップと
を更に含む、請求項8に記載の方法。 - 前記サブピクチャの前記オフセットは、前記サブピクチャの左上コーディングツリーユニット(CTU)の垂直位置及び前記サブピクチャの前記左上CTUの水平位置として指定される、請求項8又は9に記載の方法。
- 前記サブピクチャの前記オフセットは、前記ピクチャの左上CTUと前記サブピクチャの前記左上CTUとの間の差として更に指定される、請求項8乃至10のうちいずれか1項に記載の方法。
- 前記サブピクチャの前記左上CTUの前記垂直位置はsubpic_ctu_top_left_yとして前記ビットストリームに符号化され、前記サブピクチャの前記左上CTUの前記垂直位置はsubpic_ctu_top_left_xとして前記ビットストリームに符号化される、請求項8乃至11のうちいずれか1項に記載の方法。
- 前記サブピクチャの前記幅はsubpic_width_minus1として前記ビットストリームに符号化され、前記サブピクチャの前記高さはsubpic_height_minus1として前記ビットストリームに符号化される、請求項8乃至12のうちいずれか1項に記載の方法。
- 前記サブピクチャの前記幅、高さ及びオフセットは、シーケンスパラメータセット(SPS)において前記ビットストリームに符号化される、請求項8乃至13のうちいずれか1項に記載の方法。
- ビデオコーディングデバイスであって、
プロセッサと、前記プロセッサに結合された受信機と、前記プロセッサに結合されたメモリと、前記プロセッサに結合された送信機とを含み、前記プロセッサ、受信機、メモリ及び送信機は、請求項1乃至14のうちいずれか1項の方法を実行するように構成される、ビデオコーディングデバイス。 - ビデオコーディングデバイスにより使用するためのコンピュータプログラム製品を含む非一時的なコンピュータ読み取り可能媒体であって、
前記コンピュータプログラム製品は、プロセッサにより実行されたとき、前記ビデオコーディングデバイスに請求項1乃至14のうちいずれか1項に記載の方法を実行させるように、前記非一時的なコンピュータ読み取り可能媒体に記憶されたコンピュータ実行可能命令を含む、非一時的なコンピュータ読み取り可能媒体。 - デコーダであって、
サブピクチャを含むピクチャを含むビットストリームを受信するための受信手段と、
前記ビットストリームからコーディングツリーブロック(CTB)の単位の前記サブピクチャの幅及びCTBの単位の前記サブピクチャの高さを取得するための取得手段と、
前記サブピクチャの前記幅及び前記サブピクチャの前記高さに基づいて前記サブピクチャのコーディングブロックを復号するための復号手段と、
復号ビデオシーケンスの一部として表示するために、前記サブピクチャの前記コーディングブロックを転送するための転送手段と
を含むデコーダ。 - 前記デコーダは、請求項1乃至7のうちいずれか1項に記載の方法を実行するように更に構成される、請求項17に記載のデコーダ。
- エンコーダであって、
ピクチャをサブピクチャに区分するための区分手段と、
前記サブピクチャの幅及び前記サブピクチャの高さを決定するための決定手段と、
コーディングツリーブロック(CTB)の単位で前記サブピクチャの前記幅及び前記サブピクチャの前記高さをビットストリームに符号化し、前記サブピクチャのコーディングブロックを前記ビットストリームに符号化するための符号化手段と、
デコーダに向けて通信するために前記ビットストリームを記憶するための記憶手段と
を含むエンコーダ。 - 前記エンコーダは、請求項8乃至14のうちいずれか1項に記載の方法を実行するように更に構成される、請求項19に記載のエンコーダ。
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