JP2019126073A - 映像符号化及び復号化方法及び装置 - Google Patents
映像符号化及び復号化方法及び装置 Download PDFInfo
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Abstract
Description
また、HDTVと共にHDTVの4倍以上の解像度を有するUHD(Ultra High Definition)に対する関心が増大すると共に、より高い解像度、高画質の映像に対する圧縮機術が要求されている。
垂直予測モード及び水平予測モードの判断過程(S610、S620)は、互いに関連があるものではなく、互いに順序が変わってもよい。水平予測モードである場合、予測対象画素が現在ブロックの上側境界に位置した画素であるかどうかを判断する(S622)。判断結果、上側境界に位置した画素である場合、補正を実行する(S632)。画面内予測モードが水平予測モードであり、且つ上側境界に位置した画素でない場合、補正を実行しない(S630)。画面内予測モードが垂直又は水平予測モードでない場合、現在ブロックに対する予測値に対する補正を実行しない(S630)。
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)
即ち、時間的動きベクトル誘導又は時間的マージ候補誘導のための参照ブロックとして、対応位置ブロックの内部又は外部に位置したブロックを利用することができる。前記参照ブロックは、対応位置ブロックの右側下段コーナーブロック又は対応位置ブロックの中心を基準にする4個の正四角形ブロックのうち右側下段ブロックの相対的な位置によって決定されることができる。
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含まれている予測対象画素の1次予測値と、前記予測対象画素の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計算された最終補正値と、に基づいて前記予測対象画素の最終予測値を生成し、
前記予測ブロックを生成する段階は、前記現在ブロックの符号化情報によって画面内予測値の補正の可否の決定を行い、前記画面内予測値の補正の可否の決定の結果に基づいて前記予測対象画素の最終予測値を生成し、
前記予測ブロックを生成する段階は、前記現在ブロックの色差に関して画面内予測値を補正せず、
前記予測ブロックを生成する段階は、現在ブロックが32×32よりも小さい大きさを有するときに画面内予測値を補正し、
前記予測ブロックを生成する段階は、前記現在ブロックと隣接した位置の画素のうち、既に復元された画素を利用して参照画素を決定し、前記参照画素の画素値を平滑化フィルタリングし、
前記現在ブロックの量子化された係数を生成するために、ビットストリームにエントロピー復号化することによって、前記残差ブロックが生成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含まれている予測対象画素の1次予測値と、前記予測対象画素の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計算された最終補正値と、に基づいて前記予測対象画素の最終予測値を生成し、
前記予測ブロックを生成する段階は、前記現在ブロックの符号化情報によって画面内予測値の補正の可否の決定を行い、前記画面内予測値の補正の可否の決定の結果に基づいて前記予測対象画素の最終予測値を生成し、
前記予測ブロックを生成する段階は、前記現在ブロックの色差に関して画面内予測値を補正せず、
前記予測ブロックを生成する段階は、現在ブロックが32×32よりも小さい大きさを有するときに画面内予測値を補正し、
前記予測ブロックを生成する段階は、前記現在ブロックと隣接した位置の画素のうち、既に復元された画素を利用して参照画素を決定し、前記参照画素の画素値を平滑化フィルタリングし、
前記現在ブロックの量子化された係数にエントロピー符号化することによって、前記残差ブロックがビットストリームに符号化されることを特徴とする映像符号化方法。 - 画像復号化装置によって受信され、画像に含まれる現在ブロックを復元するために用いられるビットストリームを格納するコンピュータが読み取り可能な記録媒体であって、
前記ビットストリームは、予測情報と、前記現在ブロックの残差情報を備え、
前記残差情報が復号化され、前記現在ブロックの残差ブロックを生成するために用いられ、
前記予測情報が復号化され、前記現在ブロックの予測ブロックを生成するために用いられ、
前記残差情報及び前記予測情報が、前記現在ブロックを復元するために用いられ、
前記現在ブロックに含まれている予測対象画素の1次予測値と、前記予測対象画素の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計算された最終補正値と、に基づいて前記予測対象画素の最終予測値を生成することによって、前記予測ブロックが生成され、
前記現在ブロックの符号化情報によって画面内予測値の補正の可否の決定を行い、前記画面内予測値の補正の可否の決定の結果に基づいて前記予測対象画素の最終予測値を生成することによって、前記予測ブロックが生成され、
前記現在ブロックの色差に関して画面内予測値を補正することなく、前記予測ブロックが生成され、
現在ブロックが32×32よりも小さい大きさを有するときに画面内予測値を補正することによって、前記予測ブロックが生成され、
前記現在ブロックと隣接した位置の画素のうち、既に復元された画素を利用して参照画素を決定し、前記参照画素の画素値を平滑化フィルタリングすることによって、前記予測ブロックが生成され、
前記現在ブロックの量子化された係数を生成するために、ビットストリームにエントロピー復号化することによって、前記残差ブロックが生成されることを特徴とする記録媒体。
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