JP5911028B2 - 標本の領域の結合 - Google Patents
標本の領域の結合 Download PDFInfo
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Description
さらに、コンテキストの選択に使用されるフラグは、所定のフラグが関連付けられているノードと同じ階層レベルに属しているフラグに制限されてもよい。
本発明の好適な実施の形態を、下記の図を参照して以下に説明する。
エンコーダ10の構造について説明してきたが、以下では動作のモードについてより詳細に説明する。
幅の順のトラバースの場合は、細分割情報は、図6bに示したような異なった順序で伝送される。
次に、ステップ302では、抽出部102がデータストリームからフラグまたはビットを復号化する。はじめてステップ302が行われる場合、抽出部102は、各フラグが、ツリーのルートのブロックの走査の順序140において、ツリーのルートの最初のブロック150に属しているビットシーケンスの最初のフラグであることを認識する。このフラグは階層レベル0のフラグなので、抽出部102は、ステップ302でその階層レベル0と関連付けられているコンテキストモデリングを使用して、コンテキストを判定できる。各コンテキストで、関連付けられているフラグのエントロピー復号化について、それぞれの確率の推定を行ってもよい。コンテキストの確率の推定は、それぞれのコンテキストのシンボルの統計量に対してコンテキスト別に適応されてもよい。たとえば、ステップ302での階層レベル0のフラグの復号化に適したコンテキストを判定するために、抽出部102は、コンテキストの集合のうちの、次のような1つのコンテキストを選択してもよい。そのコンテキストは、隣接するツリーブロックの階層レベル0のフラグに応じて、あるいは、さらに、上部および左の隣接するツリーブロックなど、現在処理されているツリーブロックに隣接するツリーブロックの四分木の細分割を定義するビット列内に含まれている情報に応じて、その階層レベル0に関連付けられている。
図3Cの例では、ツリーブロック150のリーフノード間での結果的な走査の順序を、符号350で示している。
参照平面グループは、一次の平面グループ、または、二次的な平面グループとなる場合がある。
a.現在のリーフノードの再構築される標本:r
b.隣接するリーフの再構築される標本:r'
c.現在のリーフノードの予測因子:p
d.現在のリーフノードの残差:Res
e.現在のリーフノードの再構築される残差:RecRes
f.スケーリングおよび逆変換:SIT
g.共有フラグ:f
また、上述したとおり、図17の説明に関連して言及した単連結領域は、上記で既に示しているように、上述の予測ブロック、または、残差の細分割またはフィルタの細分割などの上述の他の細分割のいずれかに対応する。
他の実施の形態では、ここで説明されている方法の1つを実行するコンピュータプログラムが含まれ、機械による読み取りが可能な記憶媒体に記憶される。
他の実施の形態は、ここで説明されている方法の1つを実行するコンピュータプログラムがインストールされたコンピュータを備える。
Claims (2)
- 空間的なサンプリングにより得られる情報標本の配列に対してその配列が細分割されてできる複数の単連結領域のそれぞれについて、ペイロードデータをデータストリームから抽出する抽出部と、
前記複数の単連結領域の各々について、その単連結領域に関連付けられている符号化パラメータで指示されている方法でその単連結領域についてのペイロードデータを処理することによって、前記情報標本の配列から得られた前記複数の単連結領域に対して、前記情報標本の配列を前記ペイロードデータから再構築する再構築部と、
を備え、
前記抽出部は、
対象とする単連結領域について、前記複数の単連結領域のうち、前記対象とする単連結領域に隣接する単連結領域を特定し、
前記対象とする単連結領域に隣接する単連結領域の数がゼロよりも大きい場合は、前記対象とする単連結領域についての結合指標を前記データストリームから抽出し、
前記結合指標が前記対象とする単結合領域の結合処理を指示している場合は、
前記対象とする単連結領域に隣接する単連結領域の数が1である場合は、その隣接する単連結領域の符号化パラメータを前記対象とする単連結領域についての符号化パラメータとして採用し、あるいは、前記対象とする単連結領域についての符号化パラメータを前記隣接する単連結領域の符号化パラメータから予測し、前記対象とする単連結領域についての予測の残差を前記データストリームから抽出する
デコーダにおいて、
前記抽出部は、
前記特定の前に、前記対象とする単連結領域についての符号化パラメータの第1の部分集合を前記データストリームから抽出し、
前記対象とする単連結領域に隣接する単連結領域の特定の際に、前記対象とする単連結領域に隣接すると同時に、前記対象とする単連結領域についての符号化パラメータの前記第1の部分集合と、前記複数の単連結領域のそれぞれの符合化パラメータの対応する部分集合と、の間の隔たりが閾値以下の単連結領域を特定し、
前記対象とする単連結領域に隣接し前記隔たりが前記閾値以下の複数の単連結領域に基づいて、符号化パラメータの前記第1の部分集合と互いに素な、前記対象とする単連結領域についての符号化パラメータの第2の部分集合で、前記予測の残差を抽出して採用または予測を行う
構成であり、
前記符号化パラメータの第1の部分集合は、1以上の参照画像インデックスまたは動きベクトルの1以上の成分を含む、あるいは1つの参照画像インデックスと動きベクトルの1以上の成分とを含む、符号化パラメータの部分集合である
デコーダ。 - 空間的なサンプリングにより得られる情報標本の配列に対してその配列が細分割されてできる複数の単連結領域のそれぞれについて、ペイロードデータをデータストリームから抽出する抽出部と、
前記複数の単連結領域の各々について、その単連結領域に関連付けられている符号化パラメータで指示されている方法でその単連結領域についてのペイロードデータを処理することによって、前記情報標本の配列から得られた前記複数の単連結領域に対して、前記情報標本の配列を前記ペイロードデータから再構築するように構成される再構築部と、
を備え、
前記抽出部は、
対象とする単連結領域についての符号化パラメータの第1の部分集合を前記データストリームから抽出し、
前記対象とする単連結領域について、前記複数の単連結領域のうち、前記対象とする単連結領域に隣接する単連結領域を特定し、
前記対象とする単連結領域に隣接する単連結領域の数がゼロよりも大きい場合は、前記対象とする単連結領域についての結合指標を前記データストリームから抽出し、
前記結合指標が前記対象とする単連結領域の結合処理を指示している場合は、前記対象とする単連結領域に隣接する複数の単連結領域のそれぞれについて、前記対象とする単連結領域の符号化パラメータの前記第1の部分集合と、前記対象とする単連結領域に隣接する各単連結領域の符号化パラメータの対応する部分集合との間の隔たりを、所定の隔たりの基準に従って算出し、
隔たりが最小となる単連結領域の符号化パラメータの対応する部分集合を、前記第1の部分集合と互いに素な、前記対象とする単連結領域についての符号化パラメータの第2の部分集合として採用し、あるいは、前記隔たりが最小となる単連結領域の符号化パラメータの対応する部分集合から、前記対象とする単連結領域についての符号化パラメータの第2の部分集合を予測して、前記対象とする単連結領域についての予測の残差を前記データストリームから抽出する
デコーダ。
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