JP2016197896A - 映像の符号化/復号化方法及びそれを利用する装置 - Google Patents
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Abstract
【解決手段】映像の復号化方法は、現在ブロックの隣接ブロックに対する可用性を判断するステップS410と、前記可用性判断結果に基づいて現在ブロックに対するマージ候補リストを構成するステップS420と、前記マージ候補リストに基づいて現在ブロックに対する動き補償を実行するステップS430とを含む。可用性を判断するステップは、隣接ブロックに対するブロック可用性情報を誘導するステップS411と、隣接ブロックの動き情報に対する可用性を誘導するステップS413とを含む。隣接ブロックに対する可用性を判断するステップは、隣接ブロックが複数の場合、一定の順序制約によって隣接ブロックに対する可用性を判断することができる。
【選択図】図4
Description
復元映像は、参照映像バッファ270に格納されて画面間予測に使われることができる。
インター予測のために適用される予測モードには、AMVP(Advanced Motion Vector Predictor)、マージ(merge)などがある。
本発明は、このような隣接ブロックに対して動き候補として使用可能かどうかに対する動き情報可用性を決定する順序を制約することによって、同一符号化ユニット(CU)に属する予測ユニット(PU)の動き候補リスト(動き候補リスト)を並列的に構成することを可能にする。
現在PUブロックがマージモードに符号化された場合、Merge_flagは‘1’に設定され、その反対も設定することができる。
Claims (5)
- 映像の復号化方法において、
現在ブロックの残余サンプル(residual samples)を取得するステップ;
前記現在ブロックに隣接する空間的隣接ブロックの可用性を決定するステップであって、前記空間的隣接ブロックの前記可用性は、前記空間的隣接ブロックがインター予測に利用可能かどうかを示すブロック可用性と、前記空間的隣接ブロックの動き情報が前記インター予測に利用可能かどうかを示す動き情報可用性とを有する、ステップ;
前記空間的隣接ブロックの前記可用性に基づいて前記現在ブロックに対するマージ候補リストを生成するステップ;
前記マージ候補リストに基づいて、前記現在ブロックの予測サンプルを取得するステップ;および
前記残余サンプルおよび前記予測サンプル用いて前記現在ブロックを再構成するステップ;を含み、
前記空間的隣接ブロックの前記動き情報可用性は、前記空間的隣接ブロックの前記動き情報を、ブロック可用性がトルー(true)である他の空間的隣接ブロックの動き情報と比較することによって決定され、
前記空間的隣接ブロックの前記ブロック可用性は、前記現在ブロックの位置情報および並列マージレベル情報を用いた変更処理(shifting operation)によって導出された値が、前記空間的隣接ブロックの位置情報および前記並列マージレベル情報を用いた変更処理によって導出された値と等しいかどうかに基づいて決定され、前記並列マージレベル情報は、並列マージ処理が適用可能なブロックの大きさを示すことを特徴とする映像復号化方法。 - 前記空間的隣接ブロックは、少なくとも1つの左側隣接ブロック(left neighboring block)、左下端隣接ブロック(left-bottom neighboring block)、上端隣接ブロック(top neighboring block)、上端右側隣接ブロック(top-right neighboring block)または左上端隣接ブロック(left-top neighboring block)を有する、ことを特徴とする請求項1に記載の映像復号化方法。
- 前記現在ブロックを含む符号化ブロックがNx2N, nLx2N, nRx2N, 2NxN, 2NxnUまたは2NxnDにパーティショニングされ、かつ前記符号化ブロック内の前記現在ブロックのインデックスが1の場合、前記インデックスが0の前記空間的隣接ブロックの前記ブロック可用性は前記インター予測のために利用できないと決定されることを特徴とする請求項1に記載の映像復号化方法。
- 前記空間的隣接ブロックの前記ブロック可用性は、前記空間的隣接ブロックがイントラに符号化されるかどうかに基づいて決定されることを特徴とする請求項1に記載の映像復号化方法。
- 前記左上端隣接ブロックの動き可用性は、前記上端隣接ブロックの前記ブロック可用性と、前記左上端隣接ブロックおよび前記上端隣接ブロック間の動き情報の比較とに基づいて決定されることを特徴とする請求項2に記載の映像復号化方法。
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