JP6014823B2 - ビデオのエントロピー符号化方法及びその装置、並びにビデオのエントロピー復号化方法及びその装置 - Google Patents
ビデオのエントロピー符号化方法及びその装置、並びにビデオのエントロピー復号化方法及びその装置 Download PDFInfo
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- H04N19/12—Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
- H04N19/122—Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type
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Description
=max(MinTransformSize,RootTuSize/(2^MaxTransformSizeIndex)) (1)
現在符号化単位で可能な最小変換単位サイズ「CurrMinTuSize」と比較し、基礎変換単位サイズである「RootTuSize」は、システム上採択可能な最大変換単位サイズを示す。すなわち、数式(1)によれば、「RootTuSize/(2^MaxTransformSizeIndex)」は、基礎変換単位サイズである「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、現在現在符号化単位で可能な最小変換単位サイズ「CurrMinTuSize」である。
すなわち、現在予測モードがインターモードであるならば、変換単位分割情報が0である場合の変換単位である基礎変換単位サイズである「RootTuSize」は、最大変換単位サイズ及び現在予測単位サイズのうち小さい値に設定される。
すなわち、現在予測モードがイントラモードであるならば、基礎変換単位サイズである「RootTuSize」は、最大変換単位サイズ及び現在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。
前記アルゴリズムは、pseudo codeで、次のように表現することができる。
If(trafodepth==0)ctxInc=1;
elsectxInc=0;
}
変換単位有効係数フラグは、輝度成分と色差成分とによって、別途に設定される。輝度成分の変換単位に係わる変換単位有効係数フラグcbf_lumaのエントロピー符号化のためのコンテクストモデルは、前述のように、変換単位の変換単位の変換深度が0であるか否かということよって変化するコンテクスト増加パラメータctxIncを利用して決定される。色差成分の変換単位に係わる変換単位有効係数フラグcbf_cbまたはcbf_crのエントロピー符号化のためのコンテクストモデルは、変換深度trafodepthの値を、コンテクスト増加パラメータctxIncとして利用して決定される。
Claims (2)
- 現在深度に対する分割変換フラグを、ビットストリームから獲得する段階と、
前記分割変換フラグが前記現在深度の非分割を示す場合、変換深度を前記現在深度と同じく決定する段階と、
変換単位に、0ではない変換係数が存在するか否かということを示す変換単位有効係数フラグの算術復号化のためのコンテクストモデルを示すコンテクストインデックスを決定するためのコンテクスト増加パラメータを、前記変換単位のサイズを利用せずに、前記変換単位の変換深度が所定値と同じであるか否かに基づいて決定する段階と、
前記コンテクスト増加パラメータとコンテクストオフセットとを加えて獲得された前記コンテクストインデックスを用いて、複数のコンテクストモデルのうち前記コンテクストモデルを決定する段階と、
前記決定されたコンテクストモデルに基づいて、前記変換単位有効係数フラグを算術復号化する段階と、
前記変換深度の変換単位に、0でない変換係数が存在するか否かということを前記変換単位有効係数フラグに基づき決定する段階とを含み、
前記変換単位の変換深度は符号化単位を分割した回数を示し、
前記所定値は0であり、
前記分割変換フラグが前記現在深度の分割を示す場合、前記現在深度の変換単位は次の深度の一つ以上の変換単位に分割され、前記次の深度に対する分割変換フラグが前記ビットストリームから獲得されることを特徴とするビデオ復号化方法。 - 現在深度に対する分割変換フラグを、ビットストリームから獲得し、前記分割変換フラグが前記現在深度の非分割を示す場合、変換深度を前記現在深度と同じく決定するパージング部と、
変換単位に、0ではない変換係数が存在するか否かということを示す変換単位有効係数フラグの算術復号化のためのコンテクストモデルを示すコンテクストインデックスを決定するためのコンテクスト増加パラメータを、前記変換単位のサイズを利用せずに、前記変換単位の変換深度が所定値と同じであるか否かに基づいて決定し、前記コンテクスト増加パラメータとコンテクストオフセットとを加えて獲得された前記コンテクストインデックスを用いて複数のコンテクストモデルのうち前記コンテクストモデルを決定するコンテクスト・モデラと、
前記決定されたコンテクストモデルに基づいて、前記変換単位有効係数フラグを算術復号化し、前記変換深度の変換単位に、0でない変換係数が存在するか否かということを前記変換単位有効係数フラグに基づき決定する算術復号化部と、を含み、
前記変換単位の変換深度は符号化単位を分割した回数を示し、
前記所定値は0であり、
前記分割変換フラグが前記現在深度の分割を示す場合、前記現在深度の変換単位は次の深度の一つ以上の変換単位に分割され、前記次の深度に対する分割変換フラグが前記ビットストリームから獲得されることを特徴とするビデオ復号化装置。
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