JP2018088697A - マージ候補ブロック誘導方法及びこのような方法を用いる装置 - Google Patents
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Abstract
Description
Definition)映像のような高解像度、高品質な映像への需要が、多様な応用分野において増加しつつある。映像データが高解像度、高品質になるほど既存の映像データに比べて相対的にデータ量が増加するため、既存の有無線の広帯域ネットワークのような媒体を用いて映像データを伝送するか、既存の記憶媒体を用いて記憶する場合、伝送コストと記憶コストが増加する。映像データが高解像度、高品質化になることで発生するこのような問題を解決するためには、高効率の映像圧縮技術が活用されることができる。
上記変更された空間的なマージ候補ブロックは、上記同一のMERに含まれた上記空間的なマージ候補ブロックの位置によって適応的に上記予測対象ブロックと異なるMERに含まれるように変更された空間的なマージ候補ブロックであってもよい。上記MER関連情報は、上記MERの大きさに係る情報であって、ピクチャ単位で伝送される情報であってもよい。上記予測対象ブロックと空間的なマージ候補ブロックとが同一のMERに含まれているか否かを判断するステップは、上記予測対象ブロックの位置情報、上記空間的なマージ候補ブロックの位置情報、上記MERの大きさ情報に基づく判断式を基に、上記予測対象ブロックと上記空間的なマージ候補ブロックとが同一のMERに含まれているか否かを判断するステップであってもよい。
search−based Block Matching Algorithm)、TSS(Three Step Search)、NTS(New Three−Step
Search Algorithm)など多様な方法が使用されることができる。動きベクトルは、補間された画素に基づいて1/2または1/4画素単位の動きベクトル値を持つことができる。動き予測部では、動き予測方法を異ならせて現在予測単位を予測することができる。動き予測方法として、スキップ(Skip)法、マージ(Merge)法、AMVP(Advanced Motion Vector Prediction)法など多様な方法が使用されることができる。
例えば、再整列部160では、ダイアゴナルスキャン(Diagonal Scan)法を用いて、DC係数から高周波数領域の係数までスキャンして1次元のベクトル形態に変更させることができる。変換単位の大きさ及び画面内予測モードによってダイアゴナルスキャン(Diagonal Scan)法でない2次元のブロック形態の係数を列方向にスキャンする垂直スキャン法、2次元のブロック形態の係数を行方向にスキャンする水平スキャン法が使用されることができる。すなわち、変換単位の大きさ及び画面内予測モードによってダイアゴナルスキャン、垂直方向スキャン及び水平方向スキャンのうちいずれのスキャン法が使用されるかを決定することができる。
Claims (4)
- 時間的マージ候補ブロックを決定する方法であって、
現在ブロックの境界が最大符号化ユニットの境界に隣接するか否かを決定するステップと、
前記決定するステップの結果に従って、前記現在ブロックに関連する時間的マージ候補ブロックを決定するステップであって、前記時間的マージ候補ブロックは、復号化されたピクチャに属し、前記復号化されたピクチャは、前記現在ブロックを含む現在ピクチャと異なる時間的順位を有する、ステップと、
を備えることを特徴とする時間的マージ候補ブロックを決定する方法。 - 前記現在ブロックと前記最大符号化ユニットの前記隣接する境界は、下側の境界であることを特徴とする請求項1に記載の方法。
- 前記時間的なマージ候補ブロックは、前記現在ブロック内の右下側のサンプルの位置を含む第1のブロックと、前記現在ブロック内の中央サンプルの位置を含む第2のブロックのいずれか一つを代表することを特徴とする請求項2に記載の方法。
- 前記現在ブロックの前記下側の境界が、前記最大符号化ユニットの前記下側の境界に隣接しないとき、前記第1のブロック及び前記第2のブロックの一方が、前記時間的マージ候補ブロックであると決定され、
前記現在ブロックの前記下側の境界が、前記最大符号化ユニットの前記下側の境界に隣接するとき、前記第1のブロック及び前記第2のブロックの他方が、前記時間的マージ候補ブロックであると決定されることを特徴とする請求項3に記載の方法。
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