JP5247677B2 - ビデオ信号のデコーディング/エンコーディング方法及び装置 - Google Patents
ビデオ信号のデコーディング/エンコーディング方法及び装置 Download PDFInfo
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Description
また、参照ピクチャリスト再配列部640は、他の方式によっても動作可能である。例えば、スライスタイプ確認部642を経由する前に転送されたNALのタイプを確認し、MVC NALの場合とそうでない場合とに分けて再配列しても良い。
本実施例のデコーディング装置は、ビットストリーム判断部81、視点間ピクチャグループ識別情報獲得部82及び多視点映像デコーディング部83を含む。ビットストリーム判断部81では、ビットストリームが入力されると、該ビットストリームがスケーラブルビデオコーディングされたビットストリームなのか、それとも多視点ビデオコーディングされたビットストリームなのかを判断することとなる。これは、ビットストリームに含まれたフラグ情報によって判断されることができる。
RIC_offset=IC_offset-predIC_offset
デコーディング装置では、輝度補償を行うためにビデオ信号から参照ブロックの平均画素値、現在ブロックと参照ブロックの参照番号などを抽出し、これらの情報を用いて現在ブロックの輝度差分予測値を獲得できる。そして、現在ブロックの輝度差分値と輝度差分予測値間の差値である輝度差分レジデュアルを獲得し、獲得された輝度差分レジデュアルと輝度差分予測値を用いて現在ブロックの輝度差分値を復元できる。この時、現在ブロックの輝度差分予測値を獲得するにおいて、隣接ブロックの情報を用いることができる。例えば、隣接ブロックの輝度差分値を用いて現在ブロックの輝度差分値を予測できるが、これに先立って現在ブロックの参照番号と隣接ブロックの参照番号とが同一か否かを確認し、その確認結果によって、どの隣接ブロックを用いるか、または、どの値を用いるかが決定されることができる。
NALユニットタイプが多視点ビデオコーディングのためのNALユニットタイプの場合、既存(例えば、H.264)の加重値予測を行うシンタックスは、図35及び図36のように変更されることができる。例えば、図35の3510部分は、既存の加重値予測を行うシンタックス部分に該当し、図35の3520部分は、多視点ビデオコーディングで加重値予測を行うシンタックス部分に該当する。したがって、3520部分では、NALユニットタイプが多視点ビデオコーディングのためのNALユニットタイプの場合に限って加重値予測が行われる。この場合、視点に関する情報が追加されるので、シンタックス要素は「視点(view)」部分を含んでいる。その例として、「luma_view_log2_weight_denom、chroma_view_log2_weight_denom」などが挙げられる。また、図36の3530部分は、既存の加重値予測を行うシンタックス部分に該当し、図36の3540部分は、多視点ビデオコーディングで加重値予測を行うシンタックス部分に該当する。したがって、3540部分では、NALユニットタイプが多視点ビデオコーディングのためのNALユニットタイプの場合に限って加重値予測が行われる。この場合にも同様に、視点に関する情報が追加されるので、シンタックス要素は「視点(view)」部分を含んでいる。その例として、「luma_view_weight_l1_flag、chroma_view_weight_l1_flag」などが挙げられる。このように、多視点ビデオコーディングのためのNALユニットタイプが定義される場合、現在ピクチャと異なる視点に在るピクチャの情報を用いて加重値予測を行うことによって、より効率的なコーディングが可能になる。
Claims (6)
- デコーディング装置が多視点ビデオ信号を復号する方法であって,
前記デコーディング装置が前記多視点ビデオ信号から輝度補償フラグ情報を取得するステップであって,該輝度補償フラグ情報は,現在のブロックに輝度補償が行われたかどうかを示す,ステップと,
前記デコーディング装置が前記多視点ビデオ信号から前記現在のブロックの参照インデックス情報を取得するステップと,
前記輝度補償フラグ情報が前記現在のブロックに前記輝度補償が行われたことを示すとき,前記デコーディング装置が,前記現在のブロックの参照インデックス情報が少なくとも一つの隣接ブロックの参照インデックス情報と等しいかどうかを,所定の順序に従って検査するステップと,
前記デコーディング装置が,前記検査の結果に基づいて,前記隣接ブロックの輝度差分値を用いて前記現在のブロックの輝度差分予測値を導出するステップと,
前記デコーディング装置が前記輝度差分予測値を用いて前記現在のブロックに前記輝度補償を行うステップと,
を有する方法。 - 前記所定の順序は,上隣接ブロック,左隣接ブロック,右上隣接ブロック,左上隣接ブロック,の順である,請求項1に記載の方法。
- 前記デコーディング装置が前記多視点ビデオ信号から輝度差分レジデュアルを取得するステップと,
前記デコーディング装置が,前記輝度差分レジデュアル及び前記輝度差分予測値を用いて,前記現在のブロックの輝度差分値を導出するステップと,を更に有し,
前記輝度差分レジデュアルは,前記現在のブロックの輝度差分値と,前記輝度差分予測値との差を示し,
前記輝度差分値は,前記現在のブロックの平均画素値と参照ブロックの平均画素値との差を示し,
前記参照ブロックは,前記現在のブロックによって参照される,請求項1に記載の方法。 - 前記導出ステップにおいて,前記現在のブロックの参照インデックス情報に等しい参照インデックス情報を有する,前記所定の順序に従う一つの隣接ブロックがあるとき,前記現在のブロックの輝度差分予測値は前記一つの隣接ブロックから導出される,請求項2に記載の方法。
- 前記導出ステップにおいて,前記現在のブロックの参照インデックス情報に等しい参照インデックス情報を有する隣接ブロックがないとき,前記現在のブロックの輝度差分予測値は前記隣接ブロックの輝度差分値の中央値から導出される,請求項2に記載の方法。
- 前記隣接ブロックの輝度差分値の中央値は,前記上隣接ブロックと,前記左隣接ブロックと,前記右上隣接ブロックとを用いて決定される,請求項5に記載の方法。
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JP2009532932A JP2009532932A (ja) | 2009-09-10 |
JP5247677B2 true JP5247677B2 (ja) | 2013-07-24 |
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JP2009502690A Active JP5247677B2 (ja) | 2006-03-30 | 2007-03-30 | ビデオ信号のデコーディング/エンコーディング方法及び装置 |
JP2009502688A Expired - Fee Related JP5054092B2 (ja) | 2006-03-30 | 2007-03-30 | ビデオ信号のデコーディング/エンコーディング方法及び装置 |
JP2009502692A Expired - Fee Related JP5055355B2 (ja) | 2006-03-30 | 2007-03-30 | ビデオ信号のデコーディング/エンコーディング方法及び装置 |
JP2009502691A Expired - Fee Related JP5055354B2 (ja) | 2006-03-30 | 2007-03-30 | ビデオ信号のデコーディング/エンコーディング方法及び装置 |
JP2009502689A Expired - Fee Related JP5055353B2 (ja) | 2006-03-30 | 2007-03-30 | ビデオ信号のデコーディング/エンコーディング方法及び装置 |
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JP2009502692A Expired - Fee Related JP5055355B2 (ja) | 2006-03-30 | 2007-03-30 | ビデオ信号のデコーディング/エンコーディング方法及び装置 |
JP2009502691A Expired - Fee Related JP5055354B2 (ja) | 2006-03-30 | 2007-03-30 | ビデオ信号のデコーディング/エンコーディング方法及び装置 |
JP2009502689A Expired - Fee Related JP5055353B2 (ja) | 2006-03-30 | 2007-03-30 | ビデオ信号のデコーディング/エンコーディング方法及び装置 |
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US (29) | US8565319B2 (ja) |
EP (7) | EP3139615A1 (ja) |
JP (5) | JP5247677B2 (ja) |
KR (26) | KR100934675B1 (ja) |
AU (1) | AU2007232607B2 (ja) |
BR (1) | BRPI0710048A2 (ja) |
CA (1) | CA2647735C (ja) |
DE (4) | DE202007019458U1 (ja) |
ES (3) | ES2533765T3 (ja) |
MX (1) | MX2008012437A (ja) |
PL (2) | PL2008460T3 (ja) |
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WO (5) | WO2007114610A1 (ja) |
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