JP2023123736A - 映像符号化及び復号化方法及び装置 - Google Patents
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Abstract
Description
pred1[x,y]=p[x,-1](x=0,...,BlockWidth-1;y=0,...,BlockHeight-1)
predS[x,y]=pred[x,y](x=0,...,BlockWidth-1;y=0,...,BlockHeight-1)
ここで、predS[x,y]は、最終予測値を示す。
pred1[x,y]=p[-1,y](x=0,...,BlockWidth-1;y=0,...,BlockHeight-1)
d[x,y]=d[y]=p[-1,y]-p[-1,-1](垂直方向予測の場合)
d[x,y]=d[x]=p[x,-1]-p[-1,-1](水平方向予測の場合)
このとき、数式4は、以下の数式4′のように差分の方向を変えて使用することもできる。
d[x,y]=d[y]=p[-1,-1]-p[-1,y](垂直方向予測の場合)
d[x,y]=d[x]=p[-1,-1]-p[x,-1](水平方向予測の場合)
delta[x,y]=d[x,y]>>M
このとき、2進数Mの好ましい値は、1又は2である。
predS[x,y]=Clip1Y(pred1[x,y]+delta[x,y])
ここで、Clip1Y(x)=Clip3(0,(1<<BitDepthY)-1,x)を示し、
delta[x,y]=(d[x,y]+(d[x,y]<0?2x:0))>>(x+1)(垂直方向予測モードの場合)
delta[x,y]=(d[x,y]+(d[x,y]<0?2y:0))>>(y+1)(水平方向予測モードの場合)
delta[x,y]=(d[x,y]+(d[x,y]<0?1+2x:1))>>(x+1)(垂直方向予測モードの場合)
delta[x,y]=(d[x,y]+(d[x,y]<0?1+2y:1))>>(y+1)(水平方向予測モードの場合)
delta[x,y]=d[x,y]>>(x+1)(垂直方向予測モードの場合)
delta[x,y]=d[x,y]>>(y+1)(水平方向予測モードの場合)
delta[x,y]=Sign(d[x,y])*((Abs(d[x,y])+2x)>>(x+1))(垂直方向予測モードの場合)
delta[x,y]=Sign(d[x,y])*((Abs(d[x,y])+2y)>>(y+1))(水平方向予測モードの場合)
delta[x,y]=Sign(d[x,y])*((Abs(d[x,y])+2x)>>(x+1))(垂直方向予測モードの場合)
delta[x,y]=Sign(d[x,y])*((Abs(d[x,y])+2y)>>(y+1))(水平方向予測モードの場合)
td=Clip3(-128,127,PicOrderCnt(currPic)-RefPicOrder(currPic,refIdxZ,ListZ))
tb=Clip3(-128,127,PicOrderCnt(currPic)-RefPicOrder(currPic,refIdxLX,LX))
ここで、currPicは、現在ピクチャを意味する。また、Xは、0又は1の値を有することができる。例えば、Xが0の場合、refIdxLX、LXは、refIdxL0、L0を示すことができ、これはL0時間的動き情報と関連した変数を意味する。また、refIdxLXは、参照ピクチャが割り当てられたLX参照ピクチャリスト内の参照ピクチャを指示するLX参照ピクチャインデックスを示すことができる。refIdxLX値が0の場合、refIdxLXは、LX参照ピクチャリスト内の1番目の参照ピクチャを指示し、refIdxLX値が-1の場合、refIdxLXは、参照ピクチャリスト内の参照ピクチャを指示しないことを示すことができる。また、Zは、空間的動きベクトル誘導のための参照ブロックの位置である左側に隣接した最下段ブロック、前記左側最下段ブロックの下段と隣接したブロック、前記現在ブロックの左側上段コーナーブロック、前記現在ブロックの右側上段コーナーブロック及び前記現在ブロックの隣接した上段最右側ブロックのうち少なくとも一つを指示することができる。
td=Clip3(-128,127,PicOrderCnt(colPic)-RefPicOrder(currPic,refIdxCol,ListCol))
tb=Clip3(-128,127,PicOrderCnt(currPic)-RefPicOrder(currPic,refIdxLX,LX))
ここで、colPicは、対応位置ピクチャを意味する。また、refIdxColとListColは、各々、対応位置ブロックの参照ピクチャインデックスと参照ピクチャリストを意味する。
offset=Abs(td)>>1
このとき、Abs()は絶対値関数を示し、該当関数の出力値は入力値の絶対値になる。
tx=(16384+offset)/td
tdの反比例値(tx)を算出した後、tb値及び前記td値の反比例値(tx)に基づいてスケーリング因子値を計算する(S1240)。
ScaleFactor=(tb*tx+32)>>6
scaledMV=Sign(ScaleFactor*mv)*((Abs(ScaleFactor*mv)+127)>>8)
ここで、Sign()は、特定値の符号情報を出力し(例えば、Sign(-1)の場合、-を出力する)、mvは、スケーリング前の動きベクトル値を示す。このとき、動きベクトルの各成分値であるx成分とy成分に対して各々スケーリング過程を実行することができる。
td=Clip3(-128,127,PicOrderCnt(currPic,refIdxL1,L1)-RefPicOrder(currPic,refIdxL0,L0)) tb=Clip3(-128,127,PicOrderCnt(currPic)-RefPicOrder(currPic,refIdxL0,L0))
Claims (3)
- 映像復号化方法において、
現在ブロックに対して画面内予測を実行することで、予測ブロックを生成する段階;及び、
前記予測ブロックに残差ブロックを加えて映像を復元する段階;を含み、
前記予測ブロックを生成する段階は、
前記現在ブロックに隣接する複数の使用可能な隣接画素のうち、前記現在ブロックの画面内予測モードによって指定された一つ以上の参照画素を用いて予測対象画素の1次予測値を導出し、
色要素と、前記画面内予測モードのうちの少なくとも一つに基づいて、前記1次予測値を補正するか否かを決定し、
前記決定に基づいて、前記予測対象画素の最終予測値を生成し、
前記画面内予測モードが垂直予測モードである場合、前記最終予測値を生成する段階は、
前記現在ブロックの左側上段コーナーに対角線上に隣接する参照画素の値と、前記現在ブロックに隣接する左側参照画素の値との差を利用して前記予測対象画素の初期補正値を導出し、
前記初期補正値に対する2の補数の整数表現に対して2進数の1ほど算術的右側移動を実行して最終補正値を生成し、
前記1次予測値と前記最終補正値とを合算することによって、前記最終予測値を計算し、
前記現在ブロックのビット深度によって指定された範囲内の前記最終予測値をクリッピングすることを含むことが決定されることを特徴とする映像復号化方法。 - 映像符号化方法において、
現在ブロックに対して画面内予測を実行することで、予測ブロックを生成する段階;及び、
前記予測ブロックに基づいて残差ブロックを生成する段階;を含み、
前記予測ブロックを生成する段階は、
前記現在ブロックに隣接する複数の使用可能な隣接画素のうち、前記現在ブロックの画面内予測モードによって指定された一つ以上の参照画素を用いて予測対象画素の1次予測値を導出し、
色要素と、前記画面内予測モードのうちの少なくとも一つに基づいて、前記1次予測値を補正するか否かを決定し、
前記決定に基づいて、前記予測対象画素の最終予測値を生成し、
前記画面内予測モードが垂直予測モードである場合、前記最終予測値を生成する段階は、
前記現在ブロックの左側上段コーナーに対角線上に隣接する参照画素の値と、前記現在ブロックに隣接する左側参照画素の値との差を利用して前記予測対象画素の初期補正値を導出し、
前記初期補正値に対する2の補数の整数表現に対して2進数の1ほど算術的右側移動を実行して最終補正値を生成し、
前記1次予測値と前記最終補正値とを合算することによって、前記最終予測値を計算し、
前記現在ブロックのビット深度によって指定された範囲内の前記最終予測値をクリッピングすることを含むことを特徴とする映像符号化方法。 - 映像符号化方法によって発生したビットストリームを送信する方法であって、
前記映像符号化方法は、現在ブロックに対して画面内予測を実行することで、予測ブロックを生成する段階;
前記予測ブロックに基づいて残差ブロックを生成する段階;を含み、
前記予測ブロックを生成する段階は、
前記現在ブロックに隣接する複数の使用可能な隣接画素のうち、前記現在ブロックの画面内予測モードによって指定された一つ以上の参照画素を用いて予測対象画素の1次予測値を導出し、
色要素と、前記画面内予測モードのうちの少なくとも1つに基づいて、前記1次予測値を補正するか否かを決定し、
前記決定に基づいて、前記予測対象画素の最終予測値を生成し、
前記画面内予測モードが垂直予測モードである場合、前記最終予測値を生成する段階は、
前記現在ブロックの左側上段コーナーに対角線上に隣接する参照画素の値と、前記現在ブロックに隣接する左側参照画素の値との差を利用して前記予測対象画素の初期補正値を導出し、
前記初期補正値に対する2の補数の整数表現に対して2進数の1ほど算術的右側移動を実行して最終補正値を生成し、
前記1次予測値と前記最終補正値とを合算することによって、前記最終予測値を計算し、
前記現在ブロックのビット深度によって指定された範囲内の前記最終予測値をクリッピングすることを含むことを特徴とするビットストリーム送信方法。
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