JP6680925B2 - マージモードにおける映像復号化方法 - Google Patents
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Description
本発明はさらに、たとえば、以下を提供する。
(項目1)
現在予測ユニットの動き情報を誘導する方法において、
ビットストリームからマージインデックスを抽出するステップ;
利用可能な空間及び時間マージ候補を利用してマージリストを構築するステップ;
前記マージインデックスを利用してマージリスト上のマージ候補の中からマージ予測子を選択するステップ;及び、
前記マージ予測子の動き情報を前記現在予測ユニットの動き情報として設定するステップ;を含み、
前記時間マージ候補は、参照ピクチャインデックス及び動き情報を含み、前記時間マージ候補の参照ピクチャインデックスは、0に設定され、時間マージ候補ピクチャの時間マージ候補ブロックの動きベクトルが前記時間マージ候補の動きベクトルとして設定されることを特徴とする方法。
(項目2)
現在スライスがPスライスの場合、前記時間マージ候補ピクチャは、参照ピクチャリスト0の参照ピクチャの中から選択されることを特徴とする項目1に記載の方法。
(項目3)
前記時間マージ候補ブロックは、現在予測ユニットの位置に基づいて決定されることを特徴とする項目1に記載の方法。
(項目4)
第1の候補ブロックが利用可能な場合、前記第1の候補ブロックが時間マージ候補ブロックになり、第1の候補ブロックが利用可能でない場合、第2の候補ブロックが時間マージ候補ブロックになることを特徴とする項目1に記載の方法。
(項目5)
前記第1の候補ブロックは、右下側コーナーブロック又は動きベクトル格納ユニット内の前記右下側コーナーブロックの位置に基づいて変更されたブロックであることを特徴とする項目4に記載の方法。
(項目6)
前記動きベクトル格納ユニットは、16×16であることを特徴とする項目4に記載の方法。
(項目7)
現在予測ユニットが下側LCUと接する場合、前記第1の候補ブロックは、利用可能でないと設定されることを特徴とする項目4に記載の方法。
Claims (6)
- マージモードにおいて映像データを符号化する方法であって、前記方法は、
現在のブロックの動き情報を決定することと、
前記動き情報を用いて、前記現在のブロックの予測ブロックを生成することと、
前記現在のブロックおよび前記予測ブロックを用いて、残差ブロックを生成することと、
前記残差ブロックを変換することにより、変換されたブロックを生成することと、
量子化パラメータおよび量子化マトリクスを用いて、前記変換されたブロックを量子化することにより、量子化されたブロックを生成することと、
対角線スキャンを用いて、前記量子化されたブロックの係数成分をスキャンすることと、
前記量子化されたブロックの前記スキャンされた係数成分をエントロピー符号化することと、
前記動き情報を符号化することと
を含み、
前記動き情報を符号化することは、
利用可能な空間マージ候補および時間マージ候補を用いて、マージリストを構築するサブステップと、
前記マージリストの複数のマージ候補の中からマージ予測子を選択するサブステップと、
前記マージ予測子を特定するマージインデックスを符号化するサブステップと
を含み、
前記現在のブロックが非対称分割によって分割された2番目の予測ユニットである場合には、非対称分割によって分割された1番目の予測ユニットに対応する前記空間マージ候補は、前記マージリスト上にリストされておらず、
前記量子化パラメータは、量子化ユニットごとに決定され、かつ、量子化パラメータ予測子を用いて符号化され、
前記量子化ユニットの最小サイズは、ピクチャパラメータセットによって調整され、
現在符号化ユニットの左側量子化パラメータ、上側量子化パラメータ、以前量子化パラメータの中から2つ以上の量子化パラメータが利用可能である場合には、前記左側量子化パラメータ、前記上側量子化パラメータ、前記以前量子化パラメータの中から最初の2つの利用可能な量子化パラメータを用いて、前記量子化パラメータ予測子が生成され、
前記左側量子化パラメータ、前記上側量子化パラメータ、前記以前量子化パラメータの中から1つのみが利用可能である場合には、前記利用可能な量子化パラメータが前記量子化パラメータ予測子として設定される、方法。 - 左側量子化パラメータ、上側量子化パラメータ、以前量子化パラメータのうちの少なくとも2つが利用可能である場合には、前記左側量子化パラメータ、前記上側量子化パラメータ、前記以前量子化パラメータの中から最初の2つの利用可能な量子化パラメータの平均値が前記量子化パラメータ予測子として設定される、請求項1に記載の方法。
- 前記時間マージ候補の参照ピクチャインデックスは、0に設定される、請求項1に記載の方法。
- 前記時間マージ候補の動きベクトルは、時間マージ候補ピクチャ内の時間マージ候補ブロックの動きベクトルであり、前記時間マージ候補ブロックの位置は、LCU内での前記現在のブロックの位置に依存して決定される、請求項1に記載の方法。
- 前記時間マージ候補の前記動きベクトルは、前記時間マージ候補ブロックの位置に対応する動きベクトル格納ユニットの動きベクトルである、請求項4に記載の方法。
- 前記動きベクトル格納ユニットのサイズは、16×16である、請求項5に記載の方法。
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