JP2015136188A - ピクセルグループ別ピクセル値補償のためのビデオ符号化方法とその装置、及びピクセルグループ別ピクセル値補償のためのビデオ復号化方法とその装置 - Google Patents
ピクセルグループ別ピクセル値補償のためのビデオ符号化方法とその装置、及びピクセルグループ別ピクセル値補償のためのビデオ復号化方法とその装置 Download PDFInfo
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Abstract
Description
f(x,y)<f(xmax,ymax),if |xmax−x|+|ymax−y|<ε(但し、ε>0) (4)
下記の数式(5)及び(6)によって、離散信号ピクセル(x,y)に対して、局所最小値f(xmin,ymin)及び局所最大値f(xmax,ymax)が定義される。
if(Rec[x][y]>Rec[x−1][y])Pixel_Type++;
if(Rec[x][y]<Rec[x−1][y])Pixel_Type−−;
if(Rec[x][y]>Rec[x+1][y])Pixel_Type++;
if(Rec[x][y]<Rec[x+1][y])Pixel_Type−−;
if(Rec[x][y]>Rec[x][y−1])Pixel_Type++;
if(Rec[x][y]<Rec[x][y−1])Pixel_Type−−;
if(Rec[x][y]>Rec[x][y+1])Pixel_Type++;
if(Rec[x][y]<Rec[x][y+1])Pixel_Type−−;
‘Pixel_Type’の最大値及び最小値は、それぞれ+4及び−4に仮定される。
if(Rec[x][y]>Rec[x−1][y−1])Pixel_Type++;
if(Rec[x][y]<Rec[x−1][y−1])Pixel_Type−−;
if(Rec[x][y]>Rec[x+1][y+1])Pixel_Type++;
if(Rec[x][y]<Rec[x+1][y+1])Pixel_Type−−
この場合、‘Pixel_Type’の最大値及び最小値は、それぞれ+2及び−2でありうる。
ここでiは、1次元フィルタのインデックスを示し、jは、各1次元フィルタのフィルタ係数のインデックスを示す。c[i][j]は、現在フィルタ係数、adaptive_loop_filter_prev[i][j]は、以前フィルタ係数、adaptive_loop_filter[i][j]は、フィルタ係数情報として伝送されたフィルタ係数の残差成分を示す。
pi,jは、現在ピクチャーのデブロッキングされたデータを示し、qi,jは、デブロッキングされたデータに対して水平方向の1次元フィルタリングされたデータを示す。対称形フィルタのフィルタ係数cを用いて、9個のデブロッキングされたデータに対して、5個のフィルタ係数を用いて対称的にフィルタリングされる。
fi,jは、qi,jに対して垂直方向の1次元フィルタリングしたデータを示す。フィルタ係数cはランニングフィルタリング方式によるので、水平方向の1次元フィルタリングされたデータに対して連続的に垂直方向の1次元フィルタリングが行われる。
=max(MinTransformSize,RootTuSize/(2^MaxTransformSizeIndex)) (10)
現在符号化単位で可能な最小変換単位サイズ‘CurrMinTuSize’と比較して、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す。すなわち、関係式(10)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ので、これらのうち小さな値が、現在符号化単位で可能な最小変換単位サイズ‘CurrMinTuSize’でありうる。
すなわち、現在予測モードがインターモードならば、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な値に設定される。
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な値に設定される。
Claims (4)
- ビデオ復号化装置が実行するビデオ復号化方法において、
ピクセル値補償に対する情報をビットストリームから獲得する段階と、
前記ピクセル値補償に対する情報がピクセル値帯域タイプ及びエッジタイプのうち少なくとも一つを示すとき、前記ビットストリームから複数のオフセットを獲得する段階と、
前記複数のオフセットを現在ブロックのピクセルに適用する段階を含み、
前記ピクセル値補償に対する情報が前記ピクセル値帯域タイプを示すとき、前記オフセットを適用する段階は、
複数のピクセル値帯域のうち、前記現在ブロックのピクセルのうち一つのピクセルを含む一つのピクセル値帯域を決定する段階と、
前記複数のオフセットのうち一つのオフセットを前記一つのピクセルに適用する段階を含み、
前記ピクセル値補償に対する情報が前記エッジタイプを示すとき、前記オフセットを適用する段階は、
複数のエッジパターンのうち、前記現在ブロックのピクセルのうち一つのピクセルを含む一つのエッジパターンを決定する段階と、
前記複数のオフセットのうち一つのオフセットを前記一つのピクセルに適用する段階とを含み、
前記ピクセル値補償に対する情報が前記ピクセル値帯域タイプを示すとき、前記複数のオフセットは前記複数のピクセル値帯域に対応し、前記一つのオフセットは前記一つのピクセル値帯域に対応し、
前記ピクセル値補償に対する情報が前記エッジタイプを示すとき、前記複数のオフセットは前記複数のエッジパターンに対応し、前記一つのオフセットは前記一つのエッジパターンに対応することを特徴とするビデオ復号化方法。 - 前記ピクセルと前記ピクセルの隣接ピクセルとを比較して前記エッジパターンが決定されることを特徴とする請求項1に記載のビデオ復号化方法。
- 前記ピクセル値帯域は前記ピクセルのサンプル値の範囲であることを特徴とする請求項1に記載のビデオ復号化方法。
- ビデオ復号化装置において、
ピクセル値補償に対する情報をビットストリームから獲得し、前記ピクセル値補償に対する情報がピクセル値帯域タイプ及びエッジタイプのうち少なくとも一つを示すとき、前記ビットストリームから複数のオフセットを獲得し、現在ブロックのピクセルに複数のオフセットを適用するプロセッサと備え、
前記ピクセル値補償に対する情報が前記ピクセル値帯域タイプを示すとき、前記プロセッサは、複数のピクセル値帯域のうち、前記現在ブロックのピクセルのうち一つのピクセルを含む一つのピクセル値帯域を決定し、前記複数のオフセットのうち一つのオフセットを前記一つのピクセルに適用し、
前記ピクセル値補償に対する情報が前記エッジタイプを示すとき、前記プロセッサは、複数のエッジパターンのうち、前記現在ブロックのピクセルのうち一つのピクセルを含む一つのエッジパターンを決定し、前記複数のオフセットのうち一つのオフセットを前記一つのピクセルに適用し、
前記ピクセル値補償に対する情報が前記ピクセル値帯域タイプを示すとき、前記複数のオフセットは前記複数のピクセル値帯域に対応し、前記一つのオフセットは前記一つのピクセル値帯域に対応し、
前記ピクセル値補償に対する情報が前記エッジタイプを示すとき、前記複数のオフセットは前記複数のエッジパターンに対応し、前記一つのオフセットは前記一つのエッジパターンに対応することを特徴とするビデオ復号化装置。
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