JP5650742B2 - 映像の符号化方法及びその装置、並びに映像の復号化方法及びその装置 - Google Patents
映像の符号化方法及びその装置、並びに映像の復号化方法及びその装置 Download PDFInfo
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Description
例えば、(a)現在符号化単位がサイズ64x64であり、最大変換単位サイズが32x32であるならば、(a−1)変換単位分割情報が0であるとき、変換単位のサイズを32x32、(a−2)変換単位分割情報が1であるとき、変換単位のサイズを16x16、(a−3)変換単位分割情報が2であるとき、変換単位のサイズを8x8に設定することができる。
=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、変換単位分割情報が0である場合の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してもよい。すなわち、式(1)によれば、「RootTuSize/(2^MaxTransformSizeIndex)」は、変換単位分割情報が0である場合の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から、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」であってもよい。
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もする。
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、変換単位分割情報が0である場合の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もする。
式(4)を参照するに、周辺ピクセル・フィルタリング部1210は、原周辺ピクセルのうち、現在フィルタリングされる周辺ピクセルContextOrg[n]と、その左右に位置した周辺ピクセルContextOrg[n−1],ContextOrg[n+1]との加重平均値を計算することによって、第1フィルタリングされた周辺ピクセルを生成する。第1フィルタリングされた周辺ピクセルのうち、両端のフィルタリングされた周辺ピクセルは、本来の周辺ピクセルの値を有する。すなわち、ContextFiltered1[0]=ContextOrg[0],ContextFiltered1[4N−1]=ContextOrg[4N−1」である。
式(5)を参照するに、周辺ピクセル・フィルタリング部1210は、第1フィルタリングされた周辺ピクセルのうち、現在フィルタリングされる周辺ピクセルContextFiltered1[n]と、その左右に位置した周辺ピクセルContextFiltered1[n−1],ContextFiltered1[n+1]との加重平均値を計算することによって、第2フィルタリングされた周辺ピクセルを生成する。第2フィルタリングされた周辺ピクセルのうち、両端の第2フィルタリングされた周辺ピクセルは、本来の第1フィルタリングされた周辺ピクセルの値を有する。すなわち、ContextFiltered2[0]=ContextFiltered1[0],ContextFiltered2[4N−1]=ContextFiltered1[4N−1」である。かような周辺ピクセルに対するフィルタリング過程は、2回以上反復して行われる。また、周辺ピクセルに対して適用されるフィルタのタップ(tap)数は、前述の3タップフィルタ以外に、多様なタップ数やフィルタが適用可能である。また、周辺ピクセルに対して適用されるフィルタのタップ数やフィルタのタップ係数は、予測時に選択的に適用することができる。
Claims (8)
- 映像符号化装置が実行する映像符号化方法であって、
符号化される現在ブロックに対してイントラ予測モード情報に含まれたイントラ予測方向に基づき、前記現在ブロックの周辺ピクセルに対してフィルタリングを適用するか否かを決定する段階と、
前記周辺ピクセルに対して前記フィルタリングが適用された場合、前記イントラ予測モード及びフィルタリングされた周辺ピクセルを用いて前記現在ブロックに対するイントラ予測を行う段階を含み、
前記映像は最大符号化単位のサイズに関する情報によって複数の最大符号化単位で分割され、
前記最大符号化単位は、分割情報によって深度を有する多数の符号化単位で階層的に分割され、
現在深度の符号化単位は、上位深度の符号化単位から分割された正方形のデータ単位のうち一つであり、
前記分割情報が前記現在深度で分割されることを示す場合、前記現在深度の符号化単位は周辺符号化単位と独立して下位深度の符号化単位で分割され、
前記分割情報が前記現在深度で分割されないことを示す場合、少なくとも一つの予測単位が前記現在深度の符号化単位から獲得されることを特徴とする映像符号化方法。 - 前記フィルタリングされた周辺ピクセルは、
前記現在ブロックのサイズに基づいて選択された所定個数の周辺ピクセルに対して少なくとも1回以上のフィルタリングを行い、生成されることを特徴とする請求項1に記載の映像符号化方法。 - 前記フィルタリングは、
前記周辺ピクセル間の加重平均値を利用することを特徴とする請求項2に記載の映像符号化方法。 - 前記イントラ予測を行う段階は、
前記現在ブロックの各ピクセルを中心に、tan−1(dy/dx)(dx,dyは整数)の角度を有する延長線上に位置するか、あるいは前記延長線に近い周辺ピクセルを利用して予測を行う予測モードを含むことを特徴とする請求項1に記載の映像符号化方法。 - 映像復号化装置が実行する映像復号化方法であって、
ビットストリームから、現在ブロックに対してイントラ予測方向を含むイントラ予測モード情報を抽出する段階と、
前記イントラ予測モード情報に含まれた前記イントラ予測方向に基づき、前記現在ブロックの周辺ピクセルに対してフィルタリングを適用するか否かを決定する段階と、
前記周辺ピクセルに対して前記フィルタリングが適用された場合、前記イントラ予測モード及びフィルタリングされた周辺ピクセルを用いて前記現在ブロックに対するイントラ予測を行う段階を含み、
前記映像は最大符号化単位のサイズに関する情報によって複数の最大符号化単位で分割され、
前記最大符号化単位は、分割情報によって深度を有する多数の符号化単位で階層的に分割され、
現在深度の符号化単位は、上位深度の符号化単位から分割された正方形のデータ単位のうち一つであり、
前記分割情報が前記現在深度で分割されることを示す場合、前記現在深度の符号化単位は周辺符号化単位と独立して下位深度の符号化単位で分割され、
前記分割情報が前記現在深度で分割されないことを示す場合、少なくとも一つの予測単位が前記現在深度の符号化単位から獲得されることを特徴とする映像復号化方法。 - 前記イントラ予測を行う段階は、
前記フィルタリングが適用された場合、前記現在ブロックのサイズに基づいて、前記現在ブロックの所定個数の周辺ピクセルを選択する段階と、
前記選択された所定個数の周辺ピクセルに対して、少なくとも1回以上のフィルタリングを行い、少なくとも1つのグループのフィルタリングされた周辺ピクセルを生成する段階と、を含むことを特徴とする請求項5に記載の映像復号化方法。 - 前記フィルタリングは、
前記周辺ピクセル間の加重平均値を利用することを特徴とする請求項6に記載の映像復号化方法。 - 前記イントラ予測を行う段階は、
前記現在ブロックの各ピクセルを中心に、tan−1(dy/dx)(dx,dyは整数)の角度を有する延長線上に位置するか、あるいは前記延長線に近い周辺ピクセルを利用して予測を行う予測モードを含むことを特徴とする請求項5に記載の映像復号化方法。
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