JP2015111908A - 映像復号化方法 - Google Patents
映像復号化方法 Download PDFInfo
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- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/103—Selection of coding mode or of prediction mode
- H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
- H04N19/96—Tree coding, e.g. quad-tree coding
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/80—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
Abstract
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 (1)
- 映像の復号化方法において、
現在ブロックに適用されたイントラ予測モードを示す情報をビットストリームから獲得する段階と、
前記イントラ予測モードによって、前記現在ブロックの左側に位置した周辺ピクセルの位置及び前記現在ブロックの上側に位置した周辺ピクセルの位置のうち一つを獲得する段階と、
前記周辺ピクセルの位置及び前記イントラ予測モードによって、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)及び垂直方向の固定数で指示されたり、垂直方向のdy(dyは整数)及び水平方向の固定数で指示され、
前記イントラ予測を行う段階は、
前記特定方向が水平方向のdx及び前記垂直方向の固定数によって指示される場合、
前記現在ブロックの現在ピクセルの位置及び前記dxによって、x軸上の周辺ピクセルの個数を決定する段階と、
前記周辺ピクセルのx軸上位置を前記dx及び前記固定数に基づき決定する段階と、
前記周辺ピクセルの個数が1である場合、前記x軸上の位置に存在する1つの周辺ピクセルに基づき現在ピクセルの予測値を獲得する段階と、
前記周辺ピクセルの個数が2である場合、前記x軸上の位置に存在する2つの周辺ピクセルに基づき前記現在ピクセルの予測値を獲得する段階を含むことを特徴とする映像復号化方法。
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KR1020090075854A KR101452860B1 (ko) | 2009-08-17 | 2009-08-17 | 영상의 부호화 방법 및 장치, 영상 복호화 방법 및 장치 |
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JP2013211776A Pending JP2014042321A (ja) | 2009-08-17 | 2013-10-09 | 映像の符号化方法及びその装置、映像復号化方法及びその装置 |
JP2013211775A Pending JP2014042320A (ja) | 2009-08-17 | 2013-10-09 | 映像の符号化方法及びその装置、映像復号化方法及びその装置 |
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JP2014099019A Pending JP2014180027A (ja) | 2009-08-17 | 2014-05-12 | 映像復号化方法 |
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JP2015015775A Active JP5969066B2 (ja) | 2009-08-17 | 2015-01-29 | 映像復号化方法 |
JP2015015776A Active JP5972411B2 (ja) | 2009-08-17 | 2015-01-29 | 映像復号化方法 |
JP2016137202A Active JP6276335B2 (ja) | 2009-08-17 | 2016-07-12 | 映像復号化方法及び映像復号化装置 |
JP2016137203A Active JP6276336B2 (ja) | 2009-08-17 | 2016-07-12 | 映像復号化方法及び映像復号化装置 |
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