JP4693067B2 - デジタル画像内のカラーアーティファクトを低減させるための技法 - Google Patents
デジタル画像内のカラーアーティファクトを低減させるための技法 Download PDFInfo
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Images
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/40—Scaling of whole images or parts thereof, e.g. expanding or contracting
- G06T3/4015—Image demosaicing, e.g. colour filter arrays [CFA] or Bayer patterns
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
- H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
- H04N23/843—Demosaicing, e.g. interpolating colour pixel values
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/20—Image enhancement or restoration using local operators
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/77—Retouching; Inpainting; Scratch removal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/64—Systems for the transmission or the storage of the colour picture signal; Details therefor, e.g. coding or decoding means therefor
- H04N1/648—Transmitting or storing the primary (additive or subtractive) colour signals; Compression thereof
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10024—Color image
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/10—Circuitry of solid-state image sensors [SSIS]; Control thereof for transforming different wavelengths into image signals
- H04N25/11—Arrangement of colour filter arrays [CFA]; Filter mosaics
- H04N25/13—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements
- H04N25/134—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements based on three different wavelength filter elements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Color Television Image Signal Generators (AREA)
- Image Processing (AREA)
- Color Image Communication Systems (AREA)
Description
AccumL1+=Pin (1)
AccumL2+=Pin (2)
W1の画素が累算されると、式3に示すように、合計が平均化されて、垂直方向の低域通過フィルタリングのためにL1行に送られる。同様にして、W2の画素が累算されると、式4に示すように、合計が平均化され、低域通過フィルタリングのためにL2行に送られる。
If(AccumL1=full)
AccumL1/=W1 (3)
If(AccumL2=full)
AccumL2/=W2 (4)
W1及びW2が2の累乗である場合には、平均化は右シフトによって実施されてもよい。
L1[i]+=(AccumL1−L1[1])/KL1 (5)
L2[j]+=(AccumL2−L2[j])/KL2 (6)
式5及び6中のKL1及びKL2はIIRフィルタの係数である。KL1及びKL2が2の累乗である場合には、除算は右シフトによって実行可能である。
PL1=f1*L1[m]+(1−f1)*L1[m+1] (7)
PL2=f2*L2[n]+(1−f2)*L2[n+1] (8)
上式で、f1=1−(X−m*W1)/W1であり、f2=1−(X−n*W2)/W2である。
Y=(R+(G*2)+B)/4 (9)
U=B−Y (10)
V=R−Y (11)
逆変換は以下の通りである。
R=Y+V (12)
G=Y−(U+V)/2 (13)
B=Y+U (14)
上式で、Yは輝度成分であり、U及びVは彩度成分である。
fL1=|Pout(Gr)−Pout(Gb)|/2^p (15)
fL2=|PL1(Gr)−PL1(Gb)|/2^p (16)
Uadjusted=(1−fL1)*Pout(U)+fL1*((1−fL2)*
PL1(U)+fL2*PL2(U)) (17)
Vadjusted=(1−fL1)*Pout(V)+fL1*((1−fL2)*
PL1(V)+fL2*PL2(V)) (18)
Gr及びGbが大きい場合、調整されたU及びVは、L1とL2の彩度成分を混合したものに近くなる。混合はまた、Gr−Gbの差によって重み付けされる。具体的には、L1でのGr及びGbの成分が近い場合には、L2からの影響は小さくなる。式19及び20に示すように、いくつかの制御パラメータを使用して、色混合の重み付けを調整することもできる。
f’=f−Coring (19)
If f’<0
f’=0
f’’=f'*Weighting (20)
fL1及びfL2は、{Coring、Weighting}パラメータの個別セットを有することが可能である。
110 レンズ
120 フィルタ
130 イメージセンサ
140 アナログデジタル変換器
150 デジタル信号プロセッサ
160 計算装置可読媒体
210 赤及び緑のフィルタの行
220 赤及び緑のフィルタの行
230 青及び緑のフィルタの行
240 青及び緑のフィルタの行
Claims (4)
- デジタル画像データをデモザイクする方法であって、
所与の画像に対するRAW画素データを受信するステップと、
各画素に対する第1レベルの補間画素データを決定するために、第1のデモザイクカーネルサイズを使用して前記RAW画素データを低域通過フィルタリングするステップと、
各画素に対する第2レベルの補間画素データを決定するために、第2のデモザイクカーネルサイズを使用して前記RAW画素データを低域通過フィルタリングするステップと、
前記第1レベルの補間画素データからの各画素に対して、アーティファクトが存在するかどうかを判定するステップと、
前記アーティファクトが所与の画素に存在しない場合に、前記所与の画素に対する調整済みの補間画素データを、前記所与の画素に対する前記第1レベルの補間画素データと等しくなるように設定するステップと、
前記アーティファクトが前記所与の画素に存在する場合に、前記所与の画素に対する前記調整済みの補間画素データを、前記所与の画素に対する前記第1レベルの補間画素データと前記第2レベルの補間画素データとを混合したものと等しくなるように設定するステップと、
前記調整済みの補間画素データを計算装置可読媒体に記憶するステップと、
を含み、
前記第2のデモザイクカーネルサイズが前記第1のデモザイクカーネルサイズよりも大きい、
方法。 - 前記RAW画素データがベイヤ画素データを含む、請求項1に記載の方法。
- 各画素に対する前記第1レベルの補間画素データが、赤(R)の色値、赤の行の緑(Gr)の色値、青の行の緑(Gb)の色値、及び青(B)の色値を含み、
各画素に対する前記第2レベルの補間画素データが、赤(R)の色値、赤の行の緑(Gr)の色値、青の行の緑(Gb)の色値、及び青(B)の色値を含む、
請求項1又は2に記載の方法。 - カラーアーティファクトが存在するかどうかを判定するステップが、前記第1レベルの補間画素データ内の、赤の行の緑(Gr)の色値と青の行の緑(Gb)の色値との絶対差を判定するステップを含む、請求項1〜3のいずれか一項に記載の方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US11/781,766 | 2007-07-23 | ||
US11/781,766 US8724895B2 (en) | 2007-07-23 | 2007-07-23 | Techniques for reducing color artifacts in digital images |
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JP2011000593A Division JP5205635B2 (ja) | 2007-07-23 | 2011-01-05 | デジタル画像内のカラーアーティファクトを低減させるための技法 |
Publications (3)
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JP2009038792A JP2009038792A (ja) | 2009-02-19 |
JP2009038792A5 JP2009038792A5 (ja) | 2011-02-24 |
JP4693067B2 true JP4693067B2 (ja) | 2011-06-01 |
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JP2008157066A Active JP4693067B2 (ja) | 2007-07-23 | 2008-06-16 | デジタル画像内のカラーアーティファクトを低減させるための技法 |
JP2011000593A Active JP5205635B2 (ja) | 2007-07-23 | 2011-01-05 | デジタル画像内のカラーアーティファクトを低減させるための技法 |
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Country Status (6)
Country | Link |
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US (1) | US8724895B2 (ja) |
JP (2) | JP4693067B2 (ja) |
KR (1) | KR100978688B1 (ja) |
CN (1) | CN101355709B (ja) |
DE (1) | DE102008029128A1 (ja) |
TW (1) | TWI405460B (ja) |
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