JP2016195445A - 映像復号化方法 - Google Patents
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Abstract
【解決手段】 符号化される現在ブロックのイントラ予測に利用される周辺ピクセルをフィルタリングし、フィルタリングされた周辺ピクセルを利用して、イントラ予測を行うビデオ符号化方法及びその装置、ビデオ復号化方法及びその装置である。
【選択図】 図1
Description
符号化された映像データは、映像の残存データを符号化して獲得される。
式(1)は、シフト演算を利用して、次の数式C=0.5(LeftDownPixel+RightUpPixel+1)>>1のように計算されてもよい。
A=(C*W1+LeftDownPixel*W2+((W1+W2)/2))/(W1+W2) (2)
式(2)で、W1+W2が2^nのように、2の指数乗の値を有する場合、A=(C*W1+LeftDownPixel*W2+((W1+W2)/2))/(W1+W2)は、A=(C*W1+LeftDownPixel*W2+2^(n−1))>>nのように、シフト演算を介して除算演算なしに計算可能である。
B=(C*h1+RightUpPixel*h2+((h1+h2)/2))/(h1+h2) (3)
式(3)で、h1+h2が2^mのように、2の指数乗の値を有する場合、B=(C*h1+RightUpPixel*h2+((h1+h2)/2))/(h1+h2)は、B=(C*h1+RightUpPixel*h2+2^(m−1))>>mのように、シフト演算を介して、除算演算なしに計算可能である。
Claims (2)
- 映像復号化方法において、
ビットストリームから復号化される現在ブロックに適用された予測モードを抽出する段階と、
前記予測モードがイントラ予測モードを示す場合、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、
前記イントラ予測モードは、
複数の方向のうち特定方向を指し、前記特定方向は水平方向のdx(dxは整数)及び垂直方向のdy(dyは整数)のうち一つによって指示され、
前記イントラ予測を行う段階は、
前記現在ブロックの現在ピクセルの位置及び前記イントラ予測モードによって指される前記特定方向によって、前記現在ブロックの左側及び上側のうち一つに位置した少なくとも一つの周辺ピクセルを獲得する段階と、
前記少なくとも一つの周辺ピクセルを用いて前記現在ピクセルの予測値を獲得する段階と、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基づき複数の最大符号化単位に分割され、
複数の最大符号化単位のうち現在最大符号化単位は分割情報に基づき、深度を有する複数の符号化単位に階層的に分割され、
現在深度k(kは整数)の符号化単位は上位深度(k-1)の符号化単位から分割された4つの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kにおいて分割されることを示す場合、前記現在深度kの符号化単位は周辺符号化単位と独立して、4つの下位深度(k+1)の符号化単位に分割され、
前記分割情報が前記現在深度kにおいて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kの符号化単位から獲得され、
前記現在ブロックは、前記現在深度の符号化単位から獲得された予測単位であり、
前記現在深度kの符号化単位から前記少なくとも一つの予測単位と独立して逆変換のための少なくとも一つの変換単位が獲得されることを特徴とする映像復号化方法。 - 映像復号化装置において、
ビットストリームから復号化される現在ブロックに適用された予測モードを抽出するエントロピー復号化部と、
前記抽出された予測モードがイントラ予測モードを示す場合、前記現在ブロックに対するイントラ予測を行うイントラ予測部を備え、
前記イントラ予測モードは、
複数の方向のうち特定方向を指し、前記特定方向は水平方向のdx(dxは整数)及び垂直方向のdy(dyは整数)のうち一つによって指示され、
前記イントラ予測部は、
前記現在ブロックの現在ピクセルの位置及び前記イントラ予測モードによって指される前記特定方向によって、前記現在ブロックの左側及び上側のうち一つに位置した少なくとも一つの周辺ピクセルを獲得し、前記少なくとも一つの周辺ピクセルを用いて前記現在ピクセルの予測値を獲得し、
前記映像は、最大符号化単位のサイズに関する情報に基づき複数の最大符号化単位に分割され、
複数の最大符号化単位のうち現在最大符号化単位は分割情報に基づき、深度を有する複数の符号化単位に階層的に分割され、
現在深度k(kは整数)の符号化単位は、上位深度(k-1)の符号化単位から分割された4つの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kにおいて分割されることを示す場合、前記現在深度kの符号化単位は周辺符号化単位と独立して、4つの下位深度(k+1)の符号化単位に分割され、
前記分割情報が前記現在深度kにおいて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kの符号化単位から獲得され、
前記現在ブロックは、前記現在深度の符号化単位から獲得された予測単位であり、
前記現在深度kの符号化単位から前記少なくとも一つの予測単位と独立して逆変換のための少なくとも一つの変換単位が獲得されることを特徴とする映像復号化装置。
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