JP2017139776A - エントロピ復号方法及びそれを利用する復号装置 - Google Patents
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Abstract
【解決手段】エントロピ復号部210は、イントラ予測モードに対するシンタクス要素のビンを復号するステップ及び復号されたビンに基づいてシンタクス要素の情報を取得するステップを実行する。ビンの復号ステップでは、シンタクス要素の各ビンに対し、シンタクス要素のビンストリング内のビン位置に基づいてコンテキストに基づく復号又はバイパス復号を行う。
【選択図】図2
Description
Claims (11)
- イントラ予測を利用した映像復号の方法であって、
シンタクス要素intra_chroma_pred_modeの値を導出するために前記シンタクス要素intra_chroma_pred_modeに対する一つのビンストリングのビンを復号するステップであって、前記ビンストリングの第1のビンはコンテキスト情報に基づいて復号され、前記ビンストリングの残りのビンのそれぞれは、バイパス復号に基づいて復号されるステップと、
0から4のうちの一つである前記intra_chroma_pred_modeの値に基づいて現在ブロック内のクロマ成分のためのイントラ予測モードを導出するステップと、
前記現在ブロック内の前記クロマ成分のイントラ予測は前記イントラ予測モードに基づいて実行するステップと、
前記イントラ予測の結果を前記クロマ成分のために利用して再構成されたピクチャを生成するステップと、
前記再構成されたピクチャにデブロキングフィルタ処理を実行するステップを含む、方法。 - 前記ビンを復号するステップは、前記ビンストリングの複数のビンを互いに独立に復号するステップを含む、請求項1に記載の方法。
- 独立コンテキストは、前記コンテキスト情報に基づいて復号された前記ビンに適用され、前記独立コンテキストは、他のコンテキストと独立して更新されるコンテキストである、請求項1に記載の方法。
- 前記ビンを復号するステップは、
前記バイパス復号が前記シンタクス要素に対する前記ビンストリングの一つのビンに対して実行されるか否かを決定するステップと、
前記バイパス復号が前記ビンに対して実行されないと決定されたとき、前記ビンは前記コンテキスト情報に基づいて復号されるステップとを含む、請求項1に記載の方法。 - 前記シンタクス要素に対する前記ビンストリングの一つのビンが、シンタクス要素に対応する一つのビンにコンテキストインデックスを割り当てるコンテキストインデックステーブルに関して前記ビンに割り当てられたコンテキストインデックスに基づいて復号される、請求項1に記載の方法。
- 前記ビンを復号するステップは、コンテキストインデックステーブルを利用して前記ビンを復号するステップを含み、
前記コンテキストインデックステーブルは、復号されるピクチャのためのピクチャタイプに対応するオフセット及び前記コンテキスト要素に対する前記ビンストリングの前記ビンに対するコンテキストインデックスを割り当て、
前記コンテキスト要素に対する前記ビンストリングの前記ビンは、前記コンテキストインデックス及び前記オフセットにより示されるコンテキストに基づいて復号される、請求項1に記載の方法。 - 前記ビンの2進コードは、前記バイパス復号が実行されるとき、コンテキストを利用しないように復号される、請求項1に記載の方法。
- 前記コンテキスト情報は、コンテキストインデックスオフセットと前記ビンのコンテキストインデックスとの和によって指示され、
前記コンテキストインデックスオフセットは、Iスライス、Pスライス及びBスライスのうち現在のスライスタイプに基づいて決定される、請求項1に記載の方法。 - 前記ビンは、0のビンインデックスが割り当てられるコードワードの第1のビンであり、前記バイパス復号は、前記コードワードの前記残りのビンに実行される、請求項8に記載の方法。
- 前記ビンを復号するステップは、
前記ビンストリングの第2のビンから前記シンタクス要素intra_chroma_pred_modeに対するビンストリングの前記ビンに対してバイパス復号を実行するステップを含み、
前記コンテキスト情報を導出するステップは、前記シンタクス要素intra_chroma_pred_modeに対する前記ビンストリングの第1のビンに対してコンテキスト情報を導出するステップを含む、請求項1に記載の方法。 - 前記コンテキスト情報は、コンテキストインデックスオフセットと前記ビンのコンテキストインデックスの和によって指定され、
前記コンテキストインデックスオフセットは、現在スライスがIスライスのとき0の値、前記現在スライスがPスライスのとき1の値、前記現在スライスがBスライスのとき2の値を有する、請求項10に記載の方法。
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