JP4677002B2 - 動映像符号化及び復号化方法、並びにその装置 - Google Patents
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Description
平均値が0である映像モデルに対する一般化ウィナーフィルタリングは下記数式8のように記述されうる。
数式16を見れば、平均が0である映像ブロックに対して近似化された一般化ウィナーフィルタリングは2次元DCT係数に
以下では、平均値が0でない映像モデルに対する一般化ウィナーフィルタリング方式を説明する。
平均ブロックがノイズが混ざった入力DCTブロックにS(k,l)をかけることによって得られると仮定し、すなわち数式22が成立つと仮定する場合、図3はDCT領域での平均値の加算と減算とを含む構造として図4のように再構成されうる。
一旦、平均行列S(k,l)を求めることが必要であるが、本実施例では数式22を満たすS(k,l)を選択する。本実施例では、この中、最も簡単な方法であるDCTブロックで次の数式25のようにDC値を取る。
一方、数式26を適用して多様な実験映像に適用して分散予測値を求められる。イントラブロックの場合、原映像を8×8ブロックに分けて処理し、インターブロックの場合には全域探索方法を用いてインターブロックと選択されたブロックのみを集めて数式26を適用して分散予測値を計算する。
計算された分散予測値からR=E[yyT]を求め、またRをDCT変換してΨ=ARA*Tを得る。
以下では、数式24の
量子化加重値行列決定部692はノイズ予測部680から伝送されたノイズ分散値
以下では、量子化加重値行列決定部692でノイズ予測部680から伝送されたノイズ分散値
数式25及び前記図4及び図5と関連した説明によって、F(k,l)は数式24により決定される。F(k,l)が決定されれば、図4Cに示されたように、8×8ブロックのDCT変換された係数V(k,l)は各々該当F(k,l)とかけられ、その結果である
本実施例では、前記2つの過程を1つの過程に合わせる方法を用いて、
例えば、量子化加重値行列貯蔵部694に貯蔵された量子化加重値行列が
一方、ノイズの多い映像、すなわちノイズ分散値の大きい映像で分散値の小さなブロックの場合
640 IDCT部
650 フレームメモリ部
660 動き予測及び補償部
680 ノイズ予測部
692 量子化加重値行列決定部
694 量子化加重値行列貯蔵部
Claims (4)
- 複数の量子化加重値行列を適応的に用いる動映像復号化方法において、
少なくとも1つのマクロブロックを含み、それぞれのマクロブロックは複数の量子化加重値行列のうちの前記それぞれのマクロブロックの空間的特性に対応する量子化加重値行列を特定するインデックス情報を含む、符号化された映像ストリームを受信する段階と、
前記インデックス情報に基づき、前記複数の量子化加重値行列のうちのそれぞれのマクロブロックに対応する量子化加重値行列を選択する段階と、
前記符号化された映像ストリームに対して可変長復号化を行う段階と、
前記それぞれのマクロブロックに対して前記選択された量子化加重値行列を適応的に適用することによってそれぞれの可変長復号化されたマクロブロックを逆量子化する段階とを有していて、
前記マクロブロックは前記選択された量子化加重値行列によって量子化が行われることを特徴とする動映像復号化方法。 - 前記インデックス情報が、前記入力映像ストリームのマクロブロックヘッダに含まれていることを特徴とする請求項1に記載の方法。
- 複数の量子化加重値行列を適応的に用いる動映像復号化装置において、
少なくとも1つのマクロブロックを含み、それぞれのマクロブロックは複数個の量子化加重値行列のうちの前記それぞれのマクロブロックの空間的特性に対応する量子化加重値行列を特定するインデックス情報を含む、符号化された映像ストリームを受信し、前記受信された符号化された映像ストリームに対して可変長復号化を行う可変長復号化部と、
前記複数の量子化加重値行列を貯蔵し、前記インデックス情報に基づき、前記複数の量子化加重値行列のうちのそれぞれのマクロブロックに対応する量子化加重値行列を選択し、選択された量子化加重値行列を出力する量子化加重値行列貯蔵部と、
前記それぞれのマクロブロックに対して前記量子化加重値行列貯蔵部から出力された量子化加重値 行列を適応的に適用することによってそれぞれの可変長復号化されたマクロブロックを逆量子化する逆量子化部とを有していて、
前記マクロブロックは前記選択された量子化加重値行列によって量子化が行われることを特徴とする動映像復号化装置。 - 前記インデックス情報が、前記入力映像ストリームのマクロブロックヘッダに含まれていることを特徴とする請求項3に記載の装置。
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