JP4709242B2 - ダイレクトモード動きベクトルの導出方法 - Google Patents
ダイレクトモード動きベクトルの導出方法 Download PDFInfo
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Description
MVF = TDB×MV/TDD
MVB = (TDB - TDD)×MV/TDD
または、
Z = TDB×256/TDD MVF = (Z×MV + 128)>>8
W = Z - 256 MVB = (W×MV + 128)>>8
MVF = -TDB×MV/TDD
MVB = -(TDB + TDD)×MV/TDD
または、
Z = -TDB×256/TDD MVF = (Z×MV + 128)>>8
W = Z - 256 MVB = (W×MV + 128)>>8
MVF,i = TDB,i×MVi/TDD,i
MVB,i = (TDB,i - TDD,i)×MVi/TDD,i
または、
Z = TDB,i×256/TDD,i MVF,i = (Z×MVi + 128)>>8
W = Z - 256 MVB,i = (W×MVi + 128)>>8
MVF,i = -TDB,i×MVi/TDD,i
MVB,i = -(TDB,i + TDD,i)×MVi/TDD,i
または、
Z = -TDB,i×256/TDD,i MVF,i = (Z×MVi + 128)>>8
W = Z - 256 MVB,i = (W×MVi + 128)>>8
MVF,i = TDB,i×MV/TDD
MVB,i = (TDB,i - TDD)×MV/TDD
または、
Z = TDB,i×256/TDD MVF,i = (Z×MV + 128)>>8
W = Z - 256 MVB,i = (W×MV + 128)>>8
MVF,i = -TDB,i×MV/TDD
MVB,i = -(TDB,i + TDD)×MV/TDD
または、
Z = -TDB,i×256/TDD MVF,i = (Z×MV + 128)>>8
W = Z - 256 MVB,i = (W×MV + 128)>>8
また、本発明によれば、前記Bピクチャのマクロブロックがフレームモードであり、 list 1 レファランスピクチャの同一位置にあるマクロブロックがフィールドモードであり、前記Bピクチャのダイレクトモードの list 0 レファランスピクチャが list 1 レファランスピクチャより時間的に前に存在する場合、前記Bフレームのダイレクトモードの動きベクトルMVF、MVBは、下記の式によって算出される 。ここで、 list 1 基準フレームのフィールド1にある同一位置のブロックの持つ動き情報が、ダイレクトモードの動きベクトルを求めるのに使用される。
MVF = TDB×MV1/TDD,1
MVB = (TDB - TDD,1)×MV1/TDD,1
または、
Z = TDB×256/TDD,1 MVF = (Z×MV1 + 128)>>8
W = Z - 256 MVB = (W×MV1 + 128)>>8
MVF = -TDB×MV1/TDD,1
MVB = -(TDB + TDD,1)×MV1/TDD,1
または、
Z = -TDB×256/TDD,1 MVF = (Z×MV1 + 128)>>8
W = Z - 256 MVB = (W×MV1 + 128)>>8
MVF = TDB×MV/TDD
MVB = (TDB - TDD)×MV/TDD
または、
Z = TDB×256/TDD MVF = (Z×MV + 128)>>8
W = Z - 256 MVB = (W×MV + 128)>>8
MVF = -TDB×MV/TDD
MVB = -(TDB + TDD)×MV/TDD
または、
Z = -TDB×256/TDD MVF = (Z×MV + 128)>>8
W = Z - 256 MVB = (W×MV + 128)>>8
MVB,i = (TDB,i - TDD,i)×MVi/TDD,i
または、
Z = TDB,i×256/TDD,i MVF,i = (Z×MVi + 128)>>8
W = Z - 256 MVB,i = (W×MVi + 128)>>8
MVF,i = -TDB,i×MVi/TDD,i
MVB,i = -(TDB,i + TDD,i)×MVi/TDD,i
または、
Z= -TDB,i×256/TDD,i MVF,i = (Z×MVi + 128)>>8
W = Z - 256 MVB,i = (W×MVi + 128)>>8
MVF,i = TDB,i×MV/TDD
MVB,i = (TDB,i - TDD)×MV/TDD
または、
Z = TDB,i×256/TDD MVF,i = (Z×MV + 128)>>8
W = Z - 256 MVB,i = (W×MV + 128)>>8
MVF,i = -TDB,i×MV/TDD
MVB,i = -(TDB,i + TDD)×MV/TDD
または、
Z = -TDB,i×256/TDD MVF,i = (Z×MV + 128)>>8
W = Z - 256 MVB,i = (W×MV + 128)>>8
MVB = (TDB - TDD,0)×MV0/TDD,0
または、
Z = TDB×256/TDD,0 MVF = (Z×MV0 + 128)>>8
W = Z - 256 MVB = (W×MV0 + 128)>>8
MVF = -TDB×MV0/TDD,0
MVB = -(TDB + TDD,0)×MV0 /TDD,0
または、
Z = -TDB×256/TDD,0 MVF = (Z×MV0 + 128)>>8
W = Z - 256 MVB = (W×MV0 + 128)>>8
MVF = TDB×MV/TDD
MVB = (TDB - TDD)×MV/TDD
または、
Z = TDB×256/TDD MVF = (Z×MV + 128)>>8
W = Z - 256 MVB = (W×MV + 128)>>8
MVF,i = TDB,i×MVi/TDD,i
MVB,i = (TDB,i - TDD,i)×MVi/TDD,i
または、
Z = TDB,i×256/TDD,i MVF,i = (Z×MVi + 128)>>8
W = Z - 256 MVB,i = (W×MVi + 128)>>8
MVF,i = TDB,i×MV/TDD
MVB,i = (TDB,i - TDD)×MV/TDD
または、
Z = TDB,i×256/TDD MVF,i = (Z×MV + 128)>>8
W = Z - 256 MVB,i = (W×MV + 128)>>8
MVF = TDB×MV0/TDD,0
MVB = (TDB - TDD,0)×MV0/TDD,0
または、
Z = TDB×256/TDD,0 MVF = (Z×MV0 + 128)>>8
W = Z - 256 MVB = (W×MV0 + 128)>>8
MVF = TDB×MV1/TDD,1
MVB = (TDB - TDD,1)×MV1/TDD,1
または、
Z = TDB×256/TDD,1 MVF = (Z×MV1 + 128)>>8
W = Z - 256 MVB = (W×MV1 + 128)>>8
図3の(F)および図4の(F)に示すように、ダイレクトモードの list 1 レファランスピクチャにある同位置のマクロブロックは、レファランスピクチャの時間的位置に関わらずイントラモードを持つことができる。このようなモードを有するマクロブロックは動き情報を持っていないため、従来手法では単にダイレクトモード動きベクトルを0とし、 list 0 レファランスピクチャは最近にデコーディングされたピクチャと定義した。しかし、従来手法は高いコーディング効率が保障できなかったため、本発明ではBピクチャのコーディングしようとするマクロブロックの周辺ブロックから list 0 、 list 1 レファランスピクチャと各 list に対する動きベクトルを空間的冗長性を用いて予測し、算出する。
ケース1:Bピクチャのマクロブロックと list 1 レファランスピクチャの同一位置にあるマクロブロックの両方ともフレームモードのとき
MVF = TDB×MV/TDD
MVB = (TDB - TDD)×MV/TDD
Z = TDB×256/TDD MVF = (Z×MV + 128)>>8
W = Z - 256 MVB = (W×MV + 128)>>8
MVF = -TDB×MV/TDD
MVB = -(TDB + TDD)×MV/TDD
Z = -TDB×256/TDD MVF = (Z×MV + 128)>>8
W = Z - 256 MVB = (W×MV + 128)>>8
図7では、Bピクチャのマクロブロックと list 1 レファランスピクチャの同一位置にあるマクロブロックの両方ともフィールドモードの場合を示す。Bピクチャのマクロブロックの各ブロックにおける動きベクトルは同一パリティの list 1 レファランスフィールドにある同一位置の list 0 動きベクトルから誘導される。
MVF,i = TDB,i×MVi/TDD,i
MVB,i = (TDB,i - TDD,i)×MVi/TDD,i
Z = TDB,i×256/TDD,i MVF,i = (Z×MVi + 128)>>8
W = Z - 256 MVB,i = (W×MVi + 128)>>8
MVF,i = -TDB,i×MVi/TDD,i
MVB,i = -(TDB,i + TDD,i)×MVi/TDD,i
Z = -TDB,i×256/TDD,i MVF,i = (Z×MVi + 128)>>8
W = Z - 256 MVB,i = (W×MVi + 128)>>8
MVF,i = TDB,i×MV/TDD
MVB,i = (TDB,i - TDD)×MV/TDD
W = Z - 256 MVB,i = (W×MV + 128)>>8
MVF,i = -TDB,i×MV/TDD
MVB,i = -(TDB,i + TDD)×MV/TDD
Z = -TDB,i×256/TDD MVF,i = (Z×MV + 128)>>8
W = Z - 256 MVB,i = (W×MV + 128)>>8
図9は、Bピクチャのマクロブロックがフレームモードであり、 list 1 レファランスピクチャの同一位置にあるマクロブロックがフィールドモードの場合を示す。ここで、現在マクロブロックの垂直座標をycurrentとし、 list 1 レファランスピクチャの同位置のマクロブロック垂直座標をyco-locatedとすれば、両座標の間にはyco-located=ycurrent/2の関係が成り立つ。そして、 list 1 基準フレームのフィールド0がフィールド1よりBピクチャに時間的距離が近いので、フィールド0にある同一位置のブロックの動き情報がダイレクトモードの動きベクトルを求めるのに使用される。
MVF = TDB×MV0 /TDD,0
MVB = (TDB - TDD,0 )×MV0 /TDD,0
前記式は、下記のように表すことができる。
Z = TDB×256/TDD,0 MVF = (Z×MV0 + 128)>>8
W = Z - 256 MVB = (W×MV0 + 128)>>8
MVF = -TDB×MV0 /TDD,0
MVB = -(TDB + TDD,0 )×MV0 /TDD,0
または、下記のような式で表すこともできる。
Z = -TDB×256/TDD,0 MVF = (Z×MV0 + 128)>>8
W = Z - 256 MVB = (W×MV0 + 128)>>8
この場合には list 0 、 list 1 レファランスピクチャのいずれもBピクチャより常に時間的に前に位置している。
図4に示すように、 list 1 レファランスピクチャの同一位置にあるブロックは一つの動きベクトルを持つか、二つの動きベクトルを持つことができる。本発明では、同一位置のブロックが二つの動きベクトルを持つ場合には一つの動きベクトル(L0 MVまたはL1 MV)を選び、この選ばれた動きベクトルからダイレクトモードの動きベクトルを誘導する(以下では、L0 MV( list 0 動きベクトル)が選ばれた場合を基準に説明するものとする)。
MVF = TDB×MV/TDD
MVB = (TDB - TDD)×MV/TDD
そして、前記式は下記のように表すことができる。
Z = TDB×256/TDD MVF = (Z×MV + 128)>>8
W = Z - 256 MVB = (W×MV + 128)>>8
MVF = -TDB×MV/TDD
MVB = -(TDB + TDD)×MV/TDD
または、下記のような式で表すこともできる。
Z = -TDB×256/TDD MVF = (Z×MV + 128)>>8
W = Z - 256 MVB = (W×MV + 128)>>8
仮に、ダイレクトモードの list 0 レファランスピクチャが list 1 レファランスピクチャより時間的に前に存在する場合、Bフレームの各フィールドiに対するダイレクトモードの list 0 、 list 1 動きベクトルMVF,i、MVB,iは下記のように計算される(図11の(A)および(B))。
MVF,i = TDB,i×MVi/TDD,i
MVB,i = (TDB,i - TDD,i)×MVi/TDD,i
前記式は、下記のように表すことができる。
Z = TDB,i×256/TDD,i MVF,i = (Z×MVi + 128)>>8
W = Z - 256 MVB,i = (W×MVi + 128)>>8
MVF,i = -TDB,i×MVi/TDD,i
MVB,i = -(TDB,i + TDD,i)×MVi/TDD,i
または、下記のような式で表すこともできる。
Z = -TDB,i×256/TDD,i MVF,i = (Z×MVi + 128)>>8
W = Z - 256 MVB,i = (W×MVi + 128)>>8
仮に、ダイレクトモードの list 0 レファランスピクチャが list 1 レファランスピクチャより時間的に前に存在する場合、Bフレームの各フィールドiに対するダイレクトモードの list 0 、 list 1 動きベクトルMVF,i、MVB,iは下記のように計算される(図12の(A))。
MVF,i=TDB,i×MV/TDD
MVB,i = (TDB,i - TDD)×MV/TDD
前記式は下記のように表すことができる。
Z = TDB,i×256/TDD MVF,i = (Z×MV + 128)>>8
W = Z - 256 MVB,i = (W×MV + 128)>>8
MVF,i = -TDB,i×MV/TDD
MVB,i = -(TDB,i + TDD)×MV/TDD
または、下記のような式で表すこともできる。
Z = -TDB,i×256/TDD MVF,i = (Z×MV + 128)>>8
W = Z - 256 MVB,i = (W×MV + 128)>>8
list 1 基準フレームのフィールド1(f1)がフィールド0(f0 )よりBピクチャに時間的距離が近いので、フィールド1(f1)にある同一位置のブロックの動き情報がダイレクトモードの動きベクトルを求めるのに使用される。
MVF = TDB×MV1/TDD,1
MVB = (TDB - TDD,1)×MV1/TDD,1
前記式は、下記のように表すことができる。
Z = TDB×256/TDD,1 MVF = (Z×MV1 + 128)>>8
W = Z - 256 MVB = (W×MV1 + 128)>>8
MVF = -TDB×MV1/TDD,1
MVB = -(TDB + TDD,1)×MV1/TDD,1
または、下記のような式で表すこともできる。
Z = -TDB×256/TDD,1 MVF = (Z×MV1 + 128)>>8
W = Z - 256 MVB = (W×MV1 + 128)>>8
前記ダイレクトモードの list 1 レファランスピクチャがBピクチャより時間的に前に位置するか、または後に位置する場合、各ケースに対して2種類の数式が存在することになるので、これを単純化するための方法でピクチャ間の時間的距離を符号付きの値で表すと、下記のように単純化して表される。
Bピクチャのマクロブロックと list 1 レファランスピクチャの同一位置にあるマクロブロックのいずれもフレームモードである場合、前記Bピクチャのダイレクトモードの動きベクトルMVF、MVBは下記の式から求めることができる。
MVF = TDB×MV/TDD
MVB = (TDB - TDD)×MV/TDD
または、
Z = TDB×256/TDD MVF = (Z×MV + 128)>>8
W = Z - 256 MVB = (W×MV + 128)>>8
Bピクチャのマクロブロックと list 1 レファランスピクチャの同一位置にあるマクロブロックのいずれもフィールドモードである場合、前記Bフレームの各フィールドiに対するダイレクトモードの動きベクトルMVF,i、MVB,iは下記の式から求めることができる。
MVF,i = TDB,i×MVi/TDD,i
MVB,i = (TDB,i - TDD,i)×MVi/TDD,i
または、
Z = TDB,i×256/TDD,i MVF,i = (Z×MVi + 128)>>8
W = Z - 256 MVB,i = (W×MVi + 128)>>8
Bピクチャのマクロブロックがフィールドモードであり、 list 1 レファランスピクチャの同一位置にあるマクロブロックがフレームモードである場合、前記Bフレームの各フィールドiに対するダイレクトモードの動きベクトルMVF,i、MVB,iは下記の式から求めることができる。
MVF,i = TDB,i×MV/TDD
MVB,i = (TDB,i - TDD)×MV/TDD
または、
Z = TDB,i×256/TDD MVF,i = (Z×MV + 128)>>8
W = Z - 256 MVB,i = (W×MV + 128)>>8
Bピクチャのマクロブロックがフレームモードであり、 list 1 レファランスピクチャの同一位置にあるマクロブロックがフィールドモードであり、 list 1 レファランスピクチャが前記Bピクチャより時間的に後に存在する場合、 list 1 基準フレームのフィールド0がフィールド1よりBピクチャに時間的距離が近いので、フィールド0にある同一位置のブロックの動き情報がダイレクトモードの動きベクトルを求めるのに使用される。したがって、前記Bフレームのダイレクトモードの動きベクトルMVF、MVBは、 list 1 基準フレームのフィールド0にある同一位置のブロックの動き情報がダイレクトモードの動きベクトルを求めるのに使用される下記の式から求めることができる。
MVF = TDB×MV0 /TDD,0
MVB = (TDB - TDD,0 )×MV0 /TDD,0
または、
Z = TDB×256/TDD,0 MVF = (Z×MV0 + 128)>>8
W = Z - 256 MVB = (W×MV0 + 128)>>8
MVF = TDB×MV1/TDD,1
MVB = (TDB - TDD,1)×MV1/TDD,1
または、
Z = TDB×256/TDD,1 MVF = (Z×MV1 + 128)>>8
W = Z - 256 MVB = (W×MV1 + 128)>>8
Claims (2)
- list 1レファランスピクチャの同一位置のブロックを用いた、現在のピクチャの双予測ブロックのダイレクトモード動きベクトルの導出方法であって、
前記list 1レファランスピクチャの同一位置のブロックを決定し、
前記同一位置のブロックがlist 0動きベクトルを有しているときは、前記同一位置のブロックがlist 1動きベクトルを有しているか否かにかかわらず、前記双予測ブロックの前記ダイレクトモード動きベクトルを求めるための動きベクトルとして、前記同一位置のブロックの前記list 0動きベクトルを選択し、
前記同一位置のブロックがlist 1動きベクトルのみを有しているときは、前記双予測ブロックの前記ダイレクトモード動きベクトルを求めるための動きベクトルとして、前記同一位置のブロックの前記list 1動きベクトルを選択し、
前記現在のピクチャと、前記 list 1レファランスピクチャの前記同一位置のブロックによって参照される list 0レファランスピクチャとの間の第1の時間間隔を求め、
前記list 0レファランスピクチャと前記list 1レファランスピクチャとの間の第2の時間間隔を求め、
前記第1及び第2の時間間隔に基づいて、前記 list 1レファランスピクチャの同一位置のブロックの選択された前記動きベクトルをスケーリングし、
スケーリングされた前記動きベクトルに所定のビット数だけ右方向にシフトさせるビット演算を行なうことにより前記双予測ブロックの前記ダイレクトモード動きベクトルを導出する、ことを特徴とするダイレクトモード動きベクトルの導出方法。 - ダイレクトモードのためのlist 1レファランスピクチャが前記双予測ピクチャよりも時間的に前にある場合には、list 0動きベクトルMVFとlist1動きベクトルMVBを求めるために、さらに、前記ダイレクトモードのための前記list 1レファランスピクチャの同一位置にあるブロックの動きベクトルをスケーリングする、請求項1に記載のダイレクトモード動きベクトルの導出方法。
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