JP2018139424A - 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
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 (10)
- 映像の復号化方法において、
現在ブロックに隣接する各空間的隣接ブロックの可用性を決定するステップ;
前記各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;および
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;を含み、
前記各空間的隣接ブロックの前記可用性は、空間的隣接ブロックがインター予測に利用可能である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であるかどうかを示す動き情報可用性と、を有し、
前記空間的隣接ブロックの前記ブロック可用性は、並列マージレベル情報に基づいて決定される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、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)および左上端隣接ブロック(left-top neighboring block)を有し、
前記現在ブロックの左上端サンプルの位置を(xP、yP)とする場合、前記左下端隣接ブロックは(xP-1、yP+nPSH)(ここで、nPSHは前記現在ブロックの高さを示す)に位置するピクセルを含み、前記左側隣接ブロックは(xP-1、yP+nPSH-1)に位置するピクセルを含み、前記上端右側隣接ブロックは(xP+nPSW、yP-1)(ここで、nPSWは前記現在ブロックの幅を示す)に位置するピクセルを含み、前記上端隣接ブロックは(xP+nPSW-1、yP-1)に位置するピクセルを含み、前記左上端隣接ブロックが(xP-1、yP-1)に位置するピクセルを含む、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。
- 前記左下端隣接ブロックの前記動き情報可用性は、前記左側隣接ブロックの前記ブロック可用性と、前記左下端隣接ブロックおよび前記左側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。
- 前記上端右側隣接ブロックの前記動き情報可用性は、前記上端隣接ブロックの前記ブロック可用性と、前記上端右側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。
- 前記左側隣接ブロックの前記ブロック可用性は、前記並列マージレベル情報を用いた前記現在ブロックの変更位置情報(shifting location information)によって導出された値が、前記並列マージレベル情報を用いた前記左側隣接ブロックの変更位置情報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ることを特徴とする請求項2に記載の映像復号化方法。
- 前記左上端隣接ブロックの前記動き情報可用性は、前記左上端隣接ブロック以外の隣接ブロックの動き情報可用性が利用可能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2に記載の映像復号化方法。
- 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請求項1に記載の映像復号化方法。
- 映像の符号化方法において、
現在ブロックに隣接する各空間的隣接ブロックの可用性を決定するステップ;
前記各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;および
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;を含み、
前記各空間的隣接ブロックの前記可用性は、空間的隣接ブロックがインター予測に利用可能である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であるかどうかを示す動き情報可用性と、を有し、
前記空間的隣接ブロックの前記ブロック可用性は、並列マージレベル情報に基づいて決定されることを特徴とする映像符号化方法。
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