JP6636573B2 - 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)
映像データを復号化する装置において、
輝度イントラ予測モードと色差イントラ予測モードを誘導する予測モード復号化部;
輝度変換サイズ情報を利用して輝度変換ユニットのサイズ及び色差変換ユニットのサイズを決定する予測サイズ決定部;
少なくとも一つの参照画素が利用可能でない場合、参照画素を生成する参照画素生成部;
輝度イントラ予測モードと輝度変換ユニットのサイズに基づいて現在輝度ブロックの参照画素を適応的にフィルタリングし、現在色差ブロックの参照画素は、フィルタリングしない参照画素フィルタリング部;
現在輝度ブロックと現在色差ブロックの予測ブロックを生成する予測ブロック生成部;及び、
輝度残差ブロックと色差残差ブロックを生成する残差ブロック生成部;を含むことを特徴とする装置。
(項目2)
前記色差イントラ予測モードがDMモードの場合、前記色差イントラ予測モードは、前記輝度イントラ予測モードと同じであることを特徴とする項目1に記載の装置。
(項目3)
前記輝度イントラ予測モードは、3個のMPM候補、モードグループ指示子及び予測モードインデックスを利用して誘導されることを特徴とする項目1に記載の装置。
(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、前記利用可能なイントラ予測モードと前記利用可能なイントラ予測モードにより決定される2個の追加イントラ予測モードは、前記3個のMPM候補に設定されることを特徴とする項目3に記載の装置。
(項目5)
前記利用可能なイントラ予測モードが非方向性モードの場合、残りの一つの非方向性モードと垂直モードは、前記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4に記載の装置。
(項目6)
前記予測ユニットのサイズが変換ユニットのサイズより大きい場合、前記色差イントラ予測モードは、前記色差予測ユニット内の他のブロックの色差予測ブロックを生成するのに利用されることを特徴とする項目1に記載の装置。
Claims (6)
- 輝度イントラ予測モードと色差イントラ予測モードを誘導し、前記輝度イントラ予測モードは、3個のイントラ予測モードを含むMPM(Most Probable Mode)グループ、モードグループ指示子及び予測モードインデックスを利用して誘導されるステップ;
輝度変換ユニットのサイズ及び色差変換ユニットのサイズを決定するステップ;
少なくとも一つの参照画素が利用可能でない場合、参照画素を生成するステップ;
前記輝度イントラ予測モード及び前記輝度変換ユニットのサイズに基づいて現在輝度ブロックの参照画素を適応的にフィルタリングするステップ;
前記適応的にフィルタリングされた参照画素を利用して、前記現在輝度ブロックと現在色差ブロックの予測ブロックを生成するステップ;
前記現在輝度ブロックと前記現在色差ブロックの残差ブロックを生成するステップ;
前記予測ブロックに前記残差ブロックを加えて復元ブロックを生成するステップを含み、
現在輝度予測ユニットの左側及び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前記利用可能なイントラ予測モードにより決定される2個の追加イントラ予測モードを含み、
前記モードグループ指示子が前記MPMグループを示す場合、前記MPMグループに含まれた3個のイントラ予測モードのうち前記予測モードインデックスが示すイントラ予測モードが輝度イントラ予測モードとして決定され、
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、前記輝度イントラ予測モードは、前記予測モードインデックスを前記MPMグループ内に含まれた3個のイントラ予測モードと比較して決定され、前記MPMグループ内に含まれた3個のイントラ予測モードのうち最も低いモードと最初に比較し、前記MPMグループ内に含まれた3個のイントラ予測モードのうち最も高いモードと最後に比較することを特徴とする映像復号化方法。 - 前記色差イントラ予測モードがDMモードの場合、前記色差イントラ予測モードは、前記輝度イントラ予測モードと同じであることを特徴とする請求項1に記載の方法。
- 前記利用可能なイントラ予測モードが方向性モードであれば、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請求項1に記載の方法。
- 前記利用可能なイントラ予測モードが非方向性モードの場合、残りの一つの非方向性モードと垂直モードは、前記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請求項1に記載の方法。
- 現在色差予測ユニットが前記色差変換ユニットより大きければ、前記色差イントラ予測モードが前記色差予測ユニット内の他のブロックの色差予測ブロックを生成するのに利用されることを特徴とする請求項1に記載の方法。
- 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、前記予測モードインデックスが前記予測モードインデックスと比較される前記イントラ予測モードより大きい又は同じ場合、前記予測モードインデックスの値を1ほど増加させることを特徴とする請求項1に記載の方法。
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US (11) | US9374582B2 (ja) |
EP (5) | EP3361731A1 (ja) |
JP (12) | JP5914680B2 (ja) |
KR (4) | KR20130049526A (ja) |
CN (9) | CN107483937B (ja) |
AU (1) | AU2012331602B2 (ja) |
BR (5) | BR122020015319B1 (ja) |
CA (3) | CA2999131C (ja) |
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