JP2008508750A - 適応性3dノイズ減少装置及び方法 - Google Patents
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Abstract
【選択図】図1
Description
添付図面全体にわたり同様の部分が同じ参照番号で示されていることに注意されたい。
fは、局所平均μのオリジナルイメージであり、
gは、ノイズ性イメージであり、
uは、単位平均及びσ2 u分散の乗法性ノイズであり、
vは、ゼロ平均及びσ2 v分散の加法性ノイズであり、そして
Aは、振幅信号値である(即ち、8ビット表示の場合に、Aの考えられる値は、256である)。
Yij(c、r)=Y(c+i、r+j) (1)
時間的フィルタ出力における残留ノイズは、式(7)で与えられる。座標(c、r)の考えられるピクセルにおいて、等価ノイズn1が定義され、これは、過去のフィルタリングされたノイズと、モーション値の非バイアスの推定とで構成される。
但し、εは、最終的な過剰精度を克服するための1/8又は1/16のような小さなオフセット値である。この式において決定されるべき2つの残りの未知の値は、2つあり、即ち等価ノイズ分散σ2 n1と、分散covn,n1である。
y(c,r) = m(c,r) + K(c,r)[g(c,r)-m(c,r)] (27)
ここで、次のようになる。
K(c,r) = max [0, (σ2 g(c,r) - σ2 n(c,r))/σ2 g(c,r)] (28)
一方、エラー性能は、次のように書かれる。
適応性利得計算器は、入力イメージ107の局所分散612及びイメージ入力における残留ノイズ分散σ2 nS108を受け取る。
局所適応性利得K(c、r)信号614は、最小平均二乗エラーフィルタリングを完了するために乗算器615に送られる。
係数b0(c、r)は、更に、局所信号の平均信号1004に対応する。
平均(c、r)=b0(c、r)
Claims (15)
- ビデオ入力信号における複数のノイズ形式を減少するための装置であって、
前記ビデオ入力信号、加法性ノイズ(additive noise)分散、乗法性ノイズ(multiplicative noise)分散、及びノイズの形式の指示を受け取って使用し、等価加法性ノイズ(equivalent additive noise)分散信号を推定するためのノイズ電力コンバータと、
前記等価加法性ノイズ分散及び前記ビデオ入力信号を使用して、時間的にフィルタリングされたビデオ信号及び残留ノイズ分散信号を発生するための時間リカーシブフィルタ(temporal recursive filter)と、
前記残留ノイズ分散信号及び前記時間的にフィルタリングされたビデオ信号を使用して、前記ビデオ入力信号を空間的にフィルタリングし、ノイズの減少されたビデオ出力信号を発生するための空間ノイズ減少器と、
を備えた装置。 - 前記複数のノイズ形式は、加法性(N1)、負のガンマγ写真密度を伴う乗法性(N2)、正のガンマγ写真密度を伴う乗法性(N3)、負のガンマγ写真密度を伴うスペックル(N4)、及び正のガンマγ写真密度を伴うスペックル(N5)を含む、請求項1に記載の装置。
- 前記ノイズ電力コンバータは、
前記ビデオ入力信号をフィルタリングして、ローパスフィルタリングされた信号を与えるローパスフィルタと、
前記ローパスフィルタリングされた信号及び所与のスレッシュホールド許容範囲を受け取って使用し、前記スレッシュホールド許容範囲内の局所(ローカル)分類結果を表わす2進信号ωij(c、r)、及びウインドウ内の同様のピクセルを表わす信号N(c、r)を計算するための形状適応ウインドウと、
前記2進信号ωij(c、r)、前記N(c、r)信号、及び前記ビデオ入力信号を使用して、局所(ローカル)推定平均信号値μY(c、r)を計算するための形状適応ウインドウ平均推定器と、
前記局所推定平均信号値μY(c、r)、前記加法性ノイズ分散、前記乗法性ノイズ分散、及び前記ノイズの形式の指示を使用して、前記等価加法性ノイズ分散信号を計算するための等価加法性ノイズ分散計算器と、
を備えた請求項1に記載の装置。 - 前記ウインドウにおける同様のピクセルを表わす信号N(c、r)は、次の式で与えられる、
N(c、r)=ΣΣωij(c、r)
請求項3に記載の装置。 - ビデオ入力信号における複数のノイズ形式を減少するための方法であって、
前記ビデオ入力信号、加法性ノイズの分散、乗法性ノイズの分散、及びノイズの形式の指示を使用して、等価加法性ノイズ分散信号を推定するステップと、
前記ビデオ入力信号のビデオ信号を時間的にフィルタリングするステップと、
前記等価加法性ノイズ分散及び前記ビデオ入力信号を使用して、残留ノイズ分散信号を発生するステップと、
前記残留ノイズ分散信号及び前記ビデオ入力信号を使用して、前記時間的にフィルタリングされたビデオ信号を空間フィルタリングし、ノイズの減少されたビデオ出力信号を与えるステップと、
を備えた方法。 - 前記複数のノイズ形式は、加法性(N1)、負のガンマγ写真密度を伴う乗法性(N2)、正のガンマγ写真密度を伴う乗法性(N3)、負のガンマγ写真密度を伴うスペックル(N4)、及び正のガンマγ写真密度を伴うスペックル(N5)を含む、請求項10に記載の方法。
- 前記等価加法性ノイズ分散信号を推定するステップは、
前記ビデオ入力信号をローパスフィルタリングして、ローパスフィルタリングされた信号を与える段階と、
前記ローパスフィルタリングされた信号及び所与のスレッシュホールド許容範囲を使用して、前記スレッシュホールド許容範囲内の局所(ローカル)分類結果を表わす2進信号ωij(c、r)、及びウインドウ内の同様のピクセルを表わす信号N(c、r)を計算する段階と、
前記2進信号ωij(c、r)、前記N(c、r)信号、及び前記ビデオ入力信号を使用して、局所(ローカル)推定平均信号値μY(c、r)を計算する段階と、
前記局所推定平均信号値μY(c、r)、前記加法性ノイズの分散、前記乗法性ノイズの分散、及び前記ノイズの形式の指示を使用して、前記等価加法性ノイズ分散信号を計算する段階と、
を含む請求項10に記載の方法。 - ビデオ入力信号における複数のノイズ形式を減少するための装置であって、
前記ビデオ入力信号、加法性ノイズ(additive noise)分散、乗法性ノイズ(multiplicative noise)分散、及びノイズの形式の指示を受け取って使用し、等価加法性ノイズ(equivalent additive noise)分散信号を推定するためのノイズ電力コンバータと、
前記等価加法性ノイズ分散信号及び前記ビデオ入力信号を使用して、前記ビデオ入力信号を空間的にフィルタリングし、ノイズの減少されたビデオ出力信号を発生するための空間ノイズ減少器と、
を備えた装置。 - 前記複数のノイズ形式は、加法性(N1)、負のガンマγ写真密度を伴う乗法性(N2)、正のガンマγ写真密度を伴う乗法性(N3)、負のガンマγ写真密度を伴うスペックル(N4)、及び正のガンマγ写真密度を伴うスペックル(N5)を含む、請求項14に記載の装置。
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PCT/CA2005/001194 WO2006010275A2 (en) | 2004-07-30 | 2005-07-29 | Apparatus and method for adaptive 3d noise reduction |
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WO2006010275A3 (en) | 2006-03-30 |
WO2006010275A2 (en) | 2006-02-02 |
EP1779653A2 (en) | 2007-05-02 |
CA2616871A1 (en) | 2006-02-02 |
US7418149B2 (en) | 2008-08-26 |
US20060056724A1 (en) | 2006-03-16 |
JP4733127B2 (ja) | 2011-07-27 |
EP1779653A4 (en) | 2011-09-14 |
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