JP5917744B2 - 階層的構造のデータ単位を利用したエントロピー符号化方法及び該装置、並びに復号化方法及び該装置 - Google Patents
階層的構造のデータ単位を利用したエントロピー符号化方法及び該装置、並びに復号化方法及び該装置 Download PDFInfo
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Description
=max(MinTransformSize, RootTuSize/(2^MaxTransformSizeIndex)) (1)
現在の符号化単位で決定可能な最小変換単位サイズ‘CurrMinTuSize’と比較して、基本変換単位サイズ‘RootTuSize’は、システム上採択可能な最大変換単位サイズを表す。すなわち、数式(1)によれば、‘RootTuSize/(2^MaxTransformSizeIndex)’は、基本変換単位サイズ‘RootTuSize’を最大変換単位分割情報に相応する回数ほど分割した変換単位サイズであり、‘MinTransformSize’は、最小変換単位サイズであるので、それらのうち小さい値が、現在の符号化単位で決定可能な最小変換単位サイズ‘CurrMinTuSize’である。
すなわち、現在の予測モードがインターモードであれば、変換単位分割情報が0である場合の変換単位である基本変換単位サイズ‘RootTuSize’は、最大変換単位サイズ及び現在の予測単位サイズのうち小さい値に設定される。
すなわち、現在の予測モードがイントラモードであれば、基本変換単位サイズ‘RootTuSize’は、最大変換単位サイズ及び現在のパーティション単位サイズのうち小さい値に設定される。
Claims (2)
- 符号化単位内に属する変換単位が分割されるか否かについての分割変換フラグをビットストリームから獲得するステップと、
前記分割変換フラグに基づいて少なくとも一つの 変換単位のサイズを決定するステップと、
前記変換単位のサイズ及び前記変換単位が属したピクチャのカラー類型に基づいて、コンテキストモデルを決定するステップと、
前記決定されたコンテキストモデルを利用して前記ビットストリームをエントロピー復号化することによって、前記変換単位のブロック内に0でない変換係数が存するかを表す変換係数フラグを抽出するステップと、
前記変換係数フラグに基づいて、前記変換単位内の変換係数を獲得するステップとを含み、
前記カラー類型は、輝度成分、第1色差成分及び第2色差成分のうち一つを指すカラーインデックス情報であることを特徴とするビデオ復号化方法。 - 符号化単位内に属する変換単位が分割されるか否かについての分割変換フラグをビットストリームから構文要素抽出部と、
前記分割変換フラグに基づいて少なくとも一つの変換単位のサイズを決定し、前記変換単位のサイズ及び前記変換単位が属したピクチャのカラー類型に基づいて、コンテキストモデルを決定し、前記決定されたコンテキストモデルを利用して前記ビットストリームをエントロピー復号化することによって、前記変換単位のブロック内に0でない変換係数が存するかを表す変換係数フラグを抽出するエントロピー復号化部と、
前記変換係数フラグに基づいて、前記変換単位内の変換係数を獲得する階層的 復号化部とを備え、
前記カラー類型は、輝度成分、第1色差成分及び第2色差成分のうち一つを指すカラーインデックス情報であることを特徴とするビデオ復号化装置。
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