JP2017130969A - 復元ブロック生成方法 - Google Patents
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Abstract
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 (9)
- イントラ予測で映像を符号化する装置であって、
前記装置は、
イントラ予測モードを利用して予測ブロックを生成するイントラ予測部と、
原本ブロックと前記予測ブロックとを利用して生成される残差信号を変換して変換ブロックを生成する変換部と、
量子化パラメータを決定し、量子化マトリクスと前記量子化パラメータとを利用して前記変換ブロックを量子化して量子化ブロックを生成する量子化部と、
スキャンパターンを決定し、前記スキャンパターンを前記量子化ブロックに適用して1次元係数情報を生成するスキャニング部と、
前記1次元係数情報および前記イントラ予測モードをエントロピー符号化するエントロピー符号化部と
を備え、
前記残差信号が、変換ユニットで変換され、前記変換ユニットのサイズが予め決められたサイズより小さい場合に、前記残差信号を変換するためにDSTベースの整数変換が利用され、前記変換ユニットのサイズが前記予め決められたサイズ以上である場合に、DCTベースの変換が利用され、
差分量子化パラメータが、前記量子化パラメータから量子化パラメータ予測子を減算することにより生成され、エントロピー符号化され、
現在コーディングユニットの以前量子化パラメータ、上側量子化パラメータおよび左側量子化パラメータのうちの2つ以上の量子化パラメータが利用可能な場合に、前記量子化パラメータ予測子が、予め決められた順序に従って決定された2つの利用可能な量子化パラメータを利用して生成され、1つの量子化パラメータのみが利用可能な場合に、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、装置。 - 前記予め決められた順序は、前記左側量子化パラメータ、前記上側量子化パラメータおよび前記以前量子化パラメータの順序である、請求項1に記載の装置。
- 前記左側量子化パラメータおよび前記上側量子化パラメータが利用可能な場合に、前記左側量子化パラメータおよび前記上側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に記載の装置。
- 前記左側量子化パラメータおよび前記上側量子化パラメータのうちの1つのみが利用可能な場合に、前記利用可能な量子化パラメータおよび前記以前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に記載の装置。
- 前記量子化パラメータは、量子化ユニット毎に生成され、前記量子化ユニットの最小サイズは、ピクチャ毎に調整される、請求項1に記載の装置。
- 前記変換ユニットのサイズが8×8以下である場合に、前記スキャンパターンは、前記イントラ予測モードに基づいて対角線スキャン、垂直スキャンおよび水平スキャンの中から決定される、請求項1に記載の装置。
- 前記変換ユニットのサイズが8×8よりも大きい場合に、前記スキャンパターンは、対角線スキャンである、請求項1に記載の装置。
- 前記変換ユニットのサイズが予め決められたサイズよりも大きい場合に、前記量子化ブロックが、複数のサブセットに分割され、前記スキャンパターンが、各サブセットの重要フラグ、係数符号および係数レベルに適用される、請求項1に記載の装置。
- 前記サブセットが、前記重要フラグ、前記係数符号および前記係数レベルに適用される前記スキャンパターンに従ってスキャンされる、請求項8に記載の装置。
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