JP2018201203A - データストリームにおいて符号化された変換係数ブロックを復号する装置および方法、ならびにビデオに関連するデータを記憶するための非一時コンピュータ可読媒体 - Google Patents
データストリームにおいて符号化された変換係数ブロックを復号する装置および方法、ならびにビデオに関連するデータを記憶するための非一時コンピュータ可読媒体 Download PDFInfo
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Abstract
Description
・現在の走査位置が2×2の左角304内にある場合、個別のコンテキストモデルが各走査位置に使用され(図9、左図)、
・現在の走査位置が2×2の左角内になく、かつ変換ブロックの第1行または第1列に位置しない場合には、図9の右側に示す近隣が、その周りに何もない現在の走査位置「x」の近隣において有意変換係数の数を評価するために使用され、
・その周りに何もない現在の走査位置「x」が変換ブロックの第1行にあたる場合には、図10の右図で特定される近隣が使用され、
・現在の走査位置「x」がブロックの第1列にあたる場合には、図10の左図で特定される近隣が使用される。
Claims (30)
- データストリームにおいて符号化された変換係数ブロックを復号するための装置であって、
コンテキスト適応エントロピー復号によって最後の有意シンタックス要素を前記データストリームから抽出するように構成されたデコーダであって、前記最後の有意シンタックス要素の各々が、前記変換係数ブロック内のそれぞれの位置に関連し、且つ前記それぞれの位置での変換係数が前記変換ブロック内の最後の有意変換係数であるか否かを示す、前記デコーダと、
走査順で各々の前記最後の有意シンタックス要素を前記変換係数ブロックのそれぞれの位置に関連付けるように構成されたアソシエータと
を備え、
前記デコーダが、少なくとも前記変換係数ブロック内の現在の最後の有意シンタックス要素の位置と前記現在の最後の有意シンタックス要素の位置の近隣から以前に抽出された前の最後の有意シンタックス要素に関する情報との組合せに従って選択される前記現在の最後の有意シンタックス要素のコンテキストを、前記最後の有意シンタックス要素のコンテキスト適応エントロピー復号において、使用するように構成された、装置。 - 前記近隣から以前に抽出された前記前の最後の有意シンタックス要素に関する前記情報が、前記前の最後の有意シンタックス要素の値に関する、請求項1記載の装置。
- 前記近隣から以前に抽出された前記前の最後の有意シンタックス要素に関する前記情報が、前記前の最後の有意シンタックス要素が有意変換係数の存在を示すいくつかの位置に関する、請求項1記載の装置。
- 前記現在の最後の有意シンタックス要素の前記コンテキストが、前記変換係数ブロックに関連するカラープレーンタイプにさらに基づいて選択される、請求項1記載の装置。
- 前記現在の最後の有意シンタックス要素の前記コンテキストが、前記走査順にさらに基づいて選択される、請求項1記載の装置。
- 前記現在の最後の有意シンタックス要素の位置の前記近隣が、前記現在の最後の有意シンタックス要素の前記位置に隣接する少なくとも1つの位置を含む、請求項1記載の装置。
- 前記いくつかの位置が、可能性のあるコンテキストインデックスの組を指すコンテキストインデックスに対応する、請求項3記載の装置。
- 前記近隣が、前記現在の最後の有意シンタックス要素に横方向に隣接する少なくとも1つの位置を含む、請求項6記載の装置。
- 前記近隣が、前記現在の最後の有意シンタックス要素に縦方向に隣接する少なくとも1つの位置を含む、請求項6記載の装置。
- 前記データストリームが、色見本に関連する一部分を少なくとも含む、請求項1記載の装置。
- 変換係数ブロックをデータストリームに符号化するための装置であって、前記装置が、コンテキスト適応エントロピー符号化を介して最後の有意シンタックス要素を前記データストリームに符号化するように構成され、前記最後の有意シンタックス要素の各々が前記変換係数ブロック内のそれぞれの位置に関連し、且つ、前記それぞれの位置での変換係数が前記変換ブロック内の最後の有意変換係数であるか否かを示し、
前記装置が、走査順で前記最後の有意シンタックス要素を前記データストリームに符号化するように構成され、
前記装置が、少なくとも前記変換係数ブロック内の現在の最後の有意シンタックス要素の位置と前記現在の最後の有意シンタックス要素の前記位置の近隣から以前に符号化された前の最後の有意シンタックス要素に関する情報との組合せに従って選択される前記現在の最後の有意シンタックス要素のコンテキストを、前記最後の有意シンタックス要素のコンテキスト適応エントロピー符号化において、使用するように構成された、装置。 - 前記近隣から以前に符号化された前記前の最後の有意シンタックス要素に関する前記情報が、前記前の最後の有意シンタックス要素の値に関する、請求項11記載の装置。
- 前記近隣から以前に符号化された前記前の最後の有意シンタックス要素に関する前記情報が、前記前の最後の有意シンタックス要素が有意変換係数の存在を示すいくつかの位置に関する、請求項11記載の装置。
- 前記現在の最後の有意シンタックス要素の前記コンテキストが、前記変換係数ブロックに関連するカラープレーンタイプにさらに基づいて選択される、請求項11記載の装置。
- 前記現在の最後の有意シンタックス要素の前記コンテキストが、前記走査順にさらに基づいて選択される、請求項11記載の装置。
- 前記現在の最後の有意シンタックス要素の位置の前記近隣が、前記現在の最後の有意シンタックス要素の前記位置に隣接する少なくとも1つの位置を含む、請求項11記載の装置。
- 前記いくつかの位置が、可能性のあるコンテキストインデックスの組を指すコンテキストインデックスに対応する、請求項13記載の装置。
- 前記近隣が、前記現在の最後の有意シンタックス要素に横方向に隣接する少なくとも1つの位置を含む、請求項16記載の装置。
- 前記近隣が、前記現在の最後の有意シンタックス要素に縦方向に隣接する少なくとも1つの位置を含む、請求項16記載の装置。
- 前記データストリームが、色見本に関連する一部分を少なくとも含む、請求項11記載の装置。
- ビデオに関連するデータを記憶するための非一時コンピュータ可読媒体であって、
前記非一時的コンピュータ可読媒体に記憶されたデータストリームであって、前記データストリームが、符号化された最後の有意シンタックス要素を含む変換係数ブロックに関連する情報を含み、前記最後の有意シンタックス要素の各々が、前記変換係数ブロック内のそれぞれの位置に関連し、且つ、前記それぞれの位置での変換係数が前記変換ブロック内の最後の有意変換係数であるか否かを示す、前記データストリーム
を備え、
前記最後の有意シンタックス要素が、走査順で前記データストリームに符号化され、少なくとも前記変換係数ブロック内の現在の最後の有意シンタックス要素の位置と前記現在の最後の有意シンタックス要素の前記位置の近隣から以前に符号化された前の最後の有意シンタックス要素に関する情報との組合せに従って選択される前記現在の最後の有意シンタックス要素のコンテキストを使用して適応エントロピー符号化される、コンピュータ可読媒体。 - 前記近隣から以前に符号化された前記前の最後の有意シンタックス要素に関する前記情報が、前記前の最後の有意シンタックス要素の値に関する、請求項21記載のコンピュータ可読媒体。
- 前記近隣から以前に符号化された前記前の最後の有意シンタックス要素に関する前記情報が、前記前の最後の有意シンタックス要素が有意変換係数の存在を示すいくつかの位置に関する、請求項21記載のコンピュータ可読媒体。
- データストリームにおいて符号化された変換係数ブロックを復号するための方法であって、
コンテキスト適応エントロピー復号によって最後の有意シンタックス要素を前記データストリームから抽出するステップであって、前記最後の有意シンタックス要素の各々が、前記変換係数ブロック内のそれぞれの位置に関連し、且つ、前記それぞれの位置での変換係数が前記変換ブロック内の最後の有意変換係数であるか否かを示す、前記ステップと、
走査順で各々の前記最後の有意シンタックス要素を前記変換係数ブロックのそれぞれの位置に関連付けるステップと、
少なくとも前記変換係数ブロック内の現在の最後の有意シンタックス要素の位置と前記現在の最後の有意シンタックス要素の前記位置の近隣から以前に抽出された前の最後の有意シンタックス要素に関する情報との組合せに従って選択される前記現在の最後の有意シンタックス要素のコンテキストを、前記最後の有意シンタックス要素のコンテキスト適応エントロピー復号において、使用するステップと
を含む、方法。 - 前記近隣から以前に抽出された前記前の最後の有意シンタックス要素に関する前記情報が、前記前の最後の有意シンタックス要素の値に関する、請求項24記載の方法。
- 前記近隣から以前に抽出された前記前の最後の有意シンタックス要素に関する前記情報が、前記前の最後の有意シンタックス要素が有意変換係数の存在を示すいくつかの位置に関する、請求項24記載の方法。
- 前記現在の最後の有意シンタックス要素の前記コンテキストが、前記変換係数ブロックに関連するカラープレーンタイプにさらに基づいて選択される、請求項24記載の方法。
- 前記現在の最後の有意シンタックス要素の前記コンテキストが、前記走査順にさらに基づいて選択される、請求項24記載の方法。
- 前記現在の最後の有意シンタックス要素の位置の前記近隣が、前記現在の最後の有意シンタックス要素の前記位置に隣接する少なくとも1つの位置を含む、請求項24記載の方法。
- 前記データストリームが、色見本に関連する一部分を少なくとも含む、請求項24記載の方法。
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EP10159766.4 | 2010-04-13 | ||
EP2010054822 | 2010-04-13 | ||
EPPCT/EP2010/054822 | 2010-04-13 | ||
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