JP6101316B2 - 復元ブロック生成方法 - 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)
復元ブロックを生成する方法において、
予測ユニットのイントラ予測モードを誘導するステップ;
変換サイズ情報を利用して現在ブロックのサイズを決定するステップ;
前記イントラ予測モードに応じて現在ブロックの予測ブロックを生成するステップ;
前記イントラ予測モードに応じて現在ブロックの残差ブロックを生成するステップ;及び、
前記予測ブロックと前記残差ブロックを利用して復元ブロックを生成するステップ;を含み、
現在ブロックのサイズは、予測ユニットのサイズより小さい又は同じであり、前記予測ユニット、前記残差ブロック及び前記復元ブロックのサイズは、変換ユニットのサイズと同じであることを特徴とする方法。
(項目2)
前記変換サイズ情報は、一つ以上の分割変換ユニットフラグを含むことを特徴とする項目1に記載の方法。
(項目3)
予測ユニットのイントラ予測モードを誘導するステップは、
左側イントラ予測モード及び上側イントラ予測モードを利用して3個のイントラ予測モードで構成されるMPMグループを生成するステップ;
モードグループ指示子がMPMグループを示すかどうかを判断するステップ;
前記モードグループ指示子がMPMグループを示す場合、予測モードインデックスにより特定されるMPMグループ内のイントラ予測モードを前記予測ユニットのイントラ予測モードとして設定するステップ;及び、
前記モードグループ指示子がMPMグループを示さない場合、前記イントラ予測モードインデックスと前記MPMグループ内の3個のイントラ予測モードを比較して予測ユニットのイントラ予測モードを決定するステップ;を含むことを特徴とする項目1に記載の方法。
(項目4)
前記左側イントラ予測モードと前記上側イントラ予測モードのうち一つのみが利用可能な場合、前記MPMグループは、前記利用可能なイントラ予測モードと2個の追加イントラ予測モードとで構成されることを特徴とする項目3に記載の方法。
(項目5)
前記2個の追加イントラ予測モードは、前記利用可能なイントラ予測モードに応じて決定されることを特徴とする項目4に記載の方法。
(項目6)
前記利用可能なイントラ予測モードが方向性モードの場合、DCモードとプラナーモードが前記2個の追加イントラ予測モードとして設定されることを特徴とする項目5に記載の方法。
(項目7)
前記イントラ予測モードに応じて現在ブロックの残差ブロックを生成するステップは、
符号化された残差信号をエントロピー復号化して量子化係数情報を生成するステップ;逆スキャンパターンを利用して前記量子化係数情報を逆スキャンして量子化ブロックを生成するステップ;及び、
量子化パラメータ及び逆変換を利用して前記量子化ブロックを逆量子化及び逆変換するステップ;を含み、
逆変換のタイプは、変換ユニットのサイズによっ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8)
前記逆スキャンパターンは、前記変換ユニットのサイズ及び前記イントラ予測モードに基づいて決定されることを特徴とする項目7に記載の方法。
(項目9)
前記逆スキャンパターンは、対角線スキャン、垂直スキャン及び水平スキャンの中から選択されることを特徴とする項目7に記載の方法。
Claims (8)
- 復元ブロックを生成する方法であって、
左側及び上側イントラ予測モードを利用して決定される3個のイントラ予測モードを含むMPMグループに基づいて予測ユニットのイントラ予測モードを誘導するステップ;
変換サイズ情報を利用して現在ブロックのサイズを決定するステップ;
前記イントラ予測モードに応じて前記現在ブロックの予測ブロックを生成するステップ;
前記イントラ予測モード及び現在ブロックのサイズを利用して決定される逆スキャンパターンに基づいて量子化係数情報を逆スキャンして量子化ブロックを生成するステップ;
量子化パラメータを利用して前記量子化ブロックを逆量子化し、前記逆量子化されたブロックを逆変換して残差ブロックを生成するステップ;及び
前記予測ブロックと前記残差ブロックを利用して復元ブロックを生成するステップを含み、
前記左側及び上側イントラ予測モードが互いに異なっており、いずれも非方向性モードであれば、前記MPMグループは、DCモード、プラナーモード及び垂直モードを含み、
前記現在ブロックのサイズは、予測ユニットのサイズより小さいか同じであり、前記予測ブロック、前記残差ブロック及び前記復元ブロックのサイズは、変換ユニットのサイズと同じであり、前記変換サイズ情報は、一つ以上の分割変換ユニットフラグを含み、
前記量子化パラメータは、量子化パラメータ予測子及び差分量子化パラメータを利用して生成され、現在コーディングユニットの左側及び上側量子化パラメータがいずれも利用可能な場合、前記量子化パラメータ予測子は、前記左側及び上側量子化パラメータを利用して生成され、現在コーディングユニットの左側及び上側量子化パラメータのうち一つのみが利用可能な場合、前記量子化パラメータ予測子は、前記利用可能な一つの量子化パラメータと以前量子化パラメータを利用して生成されることを特徴とする方法。 - 予測ユニットのイントラ予測モードを誘導するステップは、
前記3個のイントラ予測モードで構成されるMPMグループを生成するステップ;
モードグループ指示子がMPMグループを示すと、予測モードインデックスにより特定されるMPMグループ内のイントラ予測モードを前記予測ユニットのイントラ予測モードと設定するステップ;及び
前記モードグループ指示子がMPMグループを示さないと、前記予測モードインデックスと前記MPMグループ内の3個のイントラ予測モードを比較して前記予測ユニットのイントラ予測モードを決定するステップを含むことを特徴とする請求項1に記載の方法。 - 前記左側イントラ予測モードと前記上側イントラ予測モードのうち一つのみが利用可能であって、前記利用可能なイントラ予測モードが2個の非方向性モードのうち一つであれば、前記3個のイントラ予測モードは、2個の非方向性モードと垂直モードであり、前記左側イントラ予測モードと前記上側イントラ予測モードのうち一つのみが利用可能であって、前記利用可能なイントラ予測モードが方向性モードのうち一つであれば、前記3個のイントラ予測モードは、前記2個の非方向性モードと前記利用可能なイントラ予測モードであることを特徴とする請求項1に記載の方法。
- 逆変換のタイプは、変換ユニットのサイズによって決定されることを特徴とする請求項1に記載の方法。
- 前記逆スキャンパターンは、対角線スキャン、垂直スキャン及び水平スキャンの中から選択され、前記量子化ブロックのサイズが予め決められたサイズより大きければ、複数個のサブセットを生成し、前記サブセットを前記逆スキャンパターンを利用して逆スキャンして量子化ブロックを生成することを特徴とする請求項1に記載の方法。
- 前記差分量子化パラメータは、前記差分量子化パラメータの絶対値を示すビンストリングと前記差分量子化パラメータの符号を示すビンを利用して復元されることを特徴とする請求項1に記載の方法。
- 前記左側イントラ予測モードと前記上側イントラ予測モードとが同じであり、前記左側イントラ予測モードが非方向性モードであれば、前記MPMグループは、DCモード、プラナーモード及び垂直モードであることを特徴とする請求項1に記載の方法。
- 前記現在コーディングユニットの左側及び上側量子化パラメータがいずれも利用可能でなければ、前記量子化パラメータ予測子は、前記以前量子化パラメータと設定されることを特徴とする請求項1に記載の方法。
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