JP6768122B2 - 適応色空間変換の符号化 - Google Patents
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Description
変換(n)=w0*変換(n−1)+w1*計算変換(n)
a)
[G ] [ 1 0 0][G]
[Rb] = [−1 1 0][B]
[Rr] [−1 0 1][R]
b)
[G ] [ 1 0 0][G]
[Rb ] =[−1 1 0][B]
[Rrb] [ 0 −1 1][R]
c)
[G ] [ 1 0 0][G]
[R ] =[ 0 1 0][B]
[Rrb] [ 0 −1 1][R]
G*=IQT(QT(G’)
ここで、QTは、量子化関数、IQTは対応する逆量子化関数、G’は緑の残差データ、そして、G*は再構成された緑の残差データを表す。
Rb’=(B−G*)
ここで、Bは、青成分データを表し、Rb’はRb成分に関する残差データを表す。
Rb*=IQT(QT(Rb’)
ここで、Rb*は、再構成されたRb残差データを表す。
Rr’=(R−G*)
ここで、Rは、赤成分データを表し、Rr’はRr成分に関する残差データを表す。
Rr*=IQT(QT(Rr’)
ここで、Rr*は、再構成されたRr残差データを表す。
Claims (15)
- ビデオを符号化する方法であって、
予測画像データを原画像データと統合することで現在の画像領域の残差画像データを生成することと、ここで、前記現在の画像領域は変換ユニット(TU)である、
前記残差画像データに対して選択された色変換を実行し、変換後の残差画像データを生成することと、
前記変換後の残差画像データを符号化ビットストリームへ符号化することと、ここで、符号化ビットストリームは、当該符号化ビットストリームのTUシンタックス要素内に、選択した色変換の指標を含む
ことを有することを特徴とする方法。 - 前記変換後の残差画像データの第1の色成分は前記残差画像データの単一色成分に基づき生成され、前記変換後の残差画像データの他の色成分は前記残差画像データの前記第1の色成分に基づき予測される
ことを特徴とする請求項1に記載の方法。 - 前記符号化ビットストリームにおける画像データは個々の色成分に分割され、前記色成分それぞれへの処理経路は互いに分離されている
ことを特徴とする請求項1に記載の方法。 - 前記変換後の残差画像データの符号化することは、エントロピー符号化することを含む
ことを特徴とする請求項1に記載の方法。 - 前記選択した色変換を表すための前記TUシンタックス要素は、前記選択された色変換の2つの係数を特定する
ことを特徴とする請求項1に記載の方法。 - ビデオを符号化するシステムであって、
予測画像データを原画像データと統合することで現在の画像領域の残差画像データを生成する統合部と、ここで、前記現在の画像領域は変換ユニット(TU)である、
前記残差画像データに対して選択された色変換を実行し、変換後の残差画像データを生成する選択可能な残差変換部と、
前記変換後の残差画像データを符号化ビットストリームへ符号化する符号化部と、ここで、符号化ビットストリームは、当該符号化ビットストリームのTUシンタックス要素内に、選択した色変換の指標を含む
ことを有することを特徴とするシステム。 - 前記変換後の残差画像データの第1の色成分は前記残差画像データの単一色成分に基づき生成され、前記変換後の残差画像データの他の色成分は前記残差画像データの前記第1の色成分に基づき予測される
ことを特徴とする請求項6に記載のシステム。 - 前記符号化ビットストリームにおける画像データは個々の色成分に分割され、前記色成分それぞれへの処理経路は互いに分離されている
ことを特徴とする請求項6に記載のシステム。 - 前記符号化部はエントロピー符号化部を含む
ことを特徴とする請求項6に記載のシステム。 - 前記選択した色変換を表すための前記TUシンタックス要素は、前記選択された色変換の2つの係数を特定する
ことを特徴とする請求項6に記載のシステム。 - プロセッサの命令を有するコンピュータプログラムであって、前記プロセッサによって実行されたとき、前記プロセッサに、
予測画像データを原画像データと統合することで現在の画像領域の残差画像データを生成することと、ここで、前記現在の画像領域は変換ユニット(TU)である、
前記残差画像データに対して選択された色変換を実行し、変換後の残差画像データを生成することと、
前記変換後の残差画像データを符号化ビットストリームへ符号化することと、ここで、符号化ビットストリームは、当該符号化ビットストリームのTUシンタックス要素内に、選択した色変換の指標を含む
実行させるためのコンピュータプログラム。 - 前記変換後の残差画像データの第1の色成分は前記残差画像データの単一色成分に基づき生成され、前記変換後の残差画像データの他の色成分は前記残差画像データの前記第1の色成分に基づき予測される
ことを特徴とする請求項11に記載のコンピュータプログラム。 - 前記符号化ビットストリームにおける画像データは個々の色成分に分割され、前記色成分それぞれへの処理経路は互いに分離されていることを特徴とする請求項11に記載のコンピュータプログラム。
- 前記変換後の残差画像データの符号化することは、エントロピー符号化することを含む
ことを特徴とする請求項11に記載のコンピュータプログラム。 - 前記選択した色変換を表すための前記TUシンタックス要素は、前記選択された色変換の2つの係数を特定する
ことを特徴とする請求項11に記載のコンピュータプログラム。
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US13/940,025 US9225991B2 (en) | 2013-05-30 | 2013-07-11 | Adaptive color space transform coding |
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