JP2015146627A - イントラ予測モード復号化方法及び装置 - Google Patents
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Abstract
Description
一実施形態において、例えば、以下の項目が提供される。
(項目1)
予測モードグループ指示子及び予測モードインデックスを復元するステップ;
現在ブロックの左側及び上側ブロックの有効な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を含むMPMグループを構成するステップ;
前記予測モードグループ指示子が前記MPMグループを示す場合、前記予測モードインデックスに対応するMPMグループ内のイントラ予測モードを現在ブロックのイントラ予測モードに決定するステップ;及び、
前記予測モードグループ指示子が前記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及び前記MPMグループ内のイントラ予測モード番号を利用して現在ブロックのイントラ予測モードを決定するステップ;を含み、
非方向性イントラ予測モードが方向性イントラ予測モードより小さいイントラ予測モード番号を有することを特徴とするイントラ予測モード復号化方法。
(項目2)
現在ブロックの左側及び上側ブロックのイントラ予測モードのうち一つのみが有効な場合、2個のイントラ予測モードが前記MPMグループに追加され、前記2個のイントラ予測モードは、前記有効なイントラ予測モードによって決定されることを特徴とする項目1に記載のイントラ予測モード復号化方法。
(項目3)
プレーナモードにモード番号0が付与され、DCモードにモード番号1が付与されることを特徴とする項目1に記載のイントラ予測モード復号化方法。
(項目4)
前記左側及び上側ブロックのイントラ予測モードが有効で互いに異なる場合、前記イントラ予測モードのうち少なくとも一つが非方向性イントラ予測モードであると、方向性イントラ予測モードを前記MPMグループに追加することを特徴とする項目1に記載のイントラ予測モード復号化方法。
(項目5)
前記左側及び上側ブロックのイントラ予測モードが有効で互いに同じ場合、前記イントラ予測モードが方向性モードであると、2個の方向性モードが前記MPMグループに追加されることを特徴とする項目1に記載のイントラ予測モード復号化方法。
(項目6)
前記左側及び上側ブロックのイントラ予測モードのうち一つのみが有効な場合、2個のイントラ予測モードが前記MPMグループに追加されることを特徴とする項目1に記載のイントラ予測モード復号化方法。
(項目7)
前記有効な一つのイントラ予測モードが方向性モードである場合、前記追加される2個のイントラ予測モードは、非方向性モードであることを特徴とする項目6に記載のイントラ予測モード復号化方法。
Claims (6)
- 予測モードグループ指示子及び予測モードインデックスを復元するステップ;
現在ブロックの左側及び上側ブロックの有効な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を含むMPMグループを構成するステップ;
前記予測モードグループ指示子は、現在ブロックのイントラ予測モードが前記MPMグループに属することを示す場合、前記予測モードインデックスに対応するMPMグループ内のイントラ予測モードを現在ブロックのイントラ予測モードに決定するステップ;及び、
前記予測モードグループ指示子は、現在ブロックのイントラ予測モードが前記MPMグループに属しないことを示す場合、前記予測モードインデックス及び前記MPMグループ内の3個のイントラ予測モードのモード番号を利用して現在ブロックのイントラ予測モードを決定するステップ;を含み、
2個の非方向性イントラ予測モードは、方向性イントラ予測モードより小さいイントラ予測モード番号を有し、
前記2個の非方向性イントラ予測モードは、DCモードとプレーナモードであり、
前記左側及び上側ブロックのイントラ予測モードが互いに異なり、両方ともプレーナモードでない場合、前記MPMグループは、前記左側及び上側ブロックのイントラ予測モード及びプレーナモードを含み、
前記左側及び上側ブロックのイントラ予測モードが互いに同じであり、前記左側ブロックのイントラ予測モードが非方向性モードのうち一つの場合、前記MPMグループは、前記DCモード、前記プレーナモード及び垂直モードを含むことを特徴とするイントラ予測モード復号化方法。 - 現在ブロックの左側及び上側ブロックのイントラ予測モードのうち一つのみが有効な場合、2個のイントラ予測モードが前記MPMグループに追加され、前記2個のイントラ予測モードは、前記有効なイントラ予測モードによって決定されることを特徴とする請求項1に記載のイントラ予測モード復号化方法。
- 前記プレーナモードにモード番号0が付与され、前記DCモードにモード番号1が付与されることを特徴とする請求項1に記載のイントラ予測モード復号化方法。
- 前記左側及び上側ブロックのイントラ予測モードが互いに同じであり、前記左側ブロックのイントラ予測モードが方向性モードのうち一つの場合、前記MPMグループは、前記左側ブロックのイントラ予測モード及び前記2個の方向性モードを含むことを特徴とする請求項1に記載のイントラ予測モード復号化方法。
- 前記左側及び上側ブロックのイントラ予測モードが互いに異なり、前記左側及び上側ブロックのイントラ予測モードのうち一つが前記2個の非方向性モードのうち一つであり、他の一つが前記方向性モードのうち一つの場合、前記MPMグループは、前記2個の非方向性モードと前記方向性モードを含むことを特徴とする請求項1に記載のイントラ予測モード復号化方法。
- 前記2個の方向性イントラ予測モードは、前記左側ブロックのイントラ予測モードに隣接したイントラ予測モードであることを特徴とする請求項4に記載のイントラ予測モード復号化方法。
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EP (6) | EP2945380B1 (ja) |
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