KR960006651A - Color Correction Method and Appropriate Device - Google Patents

Color Correction Method and Appropriate Device Download PDF

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Publication number
KR960006651A
KR960006651A KR1019940017099A KR19940017099A KR960006651A KR 960006651 A KR960006651 A KR 960006651A KR 1019940017099 A KR1019940017099 A KR 1019940017099A KR 19940017099 A KR19940017099 A KR 19940017099A KR 960006651 A KR960006651 A KR 960006651A
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KR
South Korea
Prior art keywords
color
weight
importance
illumination
wavelength
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KR1019940017099A
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Korean (ko)
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KR970009063B1 (en
Inventor
이성덕
김창용
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김광호
삼성전자 주식회사
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Priority to KR1019940017099A priority Critical patent/KR970009063B1/en
Publication of KR960006651A publication Critical patent/KR960006651A/en
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Publication of KR970009063B1 publication Critical patent/KR970009063B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
    • H04N23/13—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths with multiple sensors

Abstract

칼라화상입력기기로부터 발생되는 기기종속적이며 교정되지 않은 색신호를 기기독립적이며 교정된 신호로 변환하는 색보정방법 및 이에 적합한 장치가 개시된다. 본 발명에 따른 색보정방법은 가시대역의 파장별 가중치의 중요도를 시감특성과 조명특성을 이용해 구하는 과정; 상기 파장별 가중치의 중요도를 분광반사도에 가중시켜 분광반사도, 시감특성 및 조명특성에 기초한 기저함수를 구하는 과정; 상기 분광반사도, 시감특성, 조명특성에 기초한 기저함수를 사용하여 RGB 색공간의 색신호에 대한 가중치를 구하는 과정; 및 상기 분광반사도, 시감특성, 조명특성에 기초한 기저함수를 사용하여 Weight에서 CIE XYZ로 변환할 때의 변환계수를 구하는 과정을 포함함을 특징으로 한다. 본 발명에 따른 색보정방법은 원래 화상이 갖는 색특성을 물체색 고유의 분광반사도로서 표현함으로써 보다 정확한 색재현을 실현하는 효과를 갖는다.A color correction method and apparatus suitable for converting device-dependent and uncorrected color signals generated from a color image input device into device-independent and corrected signals are disclosed. The color correction method according to the present invention comprises the steps of obtaining the importance of the weight for each wavelength of the visible band using the luminous characteristics and lighting characteristics; Obtaining a basis function based on the spectral reflectivity, visibility characteristics, and illumination characteristics by weighting the importance of the weight for each wavelength to spectral reflectivity; Obtaining weights for color signals in an RGB color space using a basis function based on the spectral reflectance, visibility characteristics, and illumination characteristics; And calculating a conversion coefficient when converting from Weight to CIE XYZ using a basis function based on the spectral reflectance, visibility characteristics, and illumination characteristics. The color correction method according to the present invention has the effect of realizing a more accurate color reproduction by expressing the color characteristics of the original image as the spectral reflectance inherent in the object color.

Description

색보정방법 및 이에 적합한 장치Color Correction Method and Appropriate Device

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 본 발명에 따른 시감 및 조명을 고려한 기저함수를 보이는 흐름도이다.1 is a flowchart showing a basis function considering the visibility and lighting according to the present invention.

제2도는 본 발명에 따른 색보정장치를 보이는 블럭도이다.2 is a block diagram showing a color correction device according to the present invention.

제3도는 제2도에 도시된 RGB-to-Weights 변환부의 구성을 보이는 도면이다.3 is a view showing the configuration of the RGB-to-Weights converter shown in FIG.

제4도는 제2도에 도시된 Weights-to-CIEXYZ 변환부의 구성을 보이는 도면이다.4 is a view showing the configuration of the Weights-to-CIEXYZ conversion unit shown in FIG.

제5도는 BPN을 이용한 RGB-to-Weights 변환계수의 생성방법을 보이는 도면이다.5 is a view showing a method of generating the RGB-to-Weights conversion coefficient using BPN.

Claims (4)

기기종속적인 RGB 색공간의 색신호를 기기독립적인 CIEXYZ 색공간의 색신호로 변환시키는 색보정방법에 있어서, 가시대역의 파장별 가중치의 중요도를 시감특성과 조명특성을 이용해 구하는 과정; 상기 파장별 가중치의 중요도를 분광반사도에 가중시켜 분광반사도, 시감특성 및 조명특성에 기초한 기저함수를 구하는 과정; 상기 분광반사도, 시감특성, 조명특성에 기초한 기저함수를 사용하여 RGB 색공간의 색신호에 대한 가중치를 구하는 과정; 및 상기 분광반사도, 시감특성, 조명특성에 기초한 기저함수를 사용하여 Weight에서 CIE XYZ로 변환할 때의 변환계수를 구하는 과정을 포함하는 색보정방법.CLAIMS 1. A color correction method for converting a color signal of a device-dependent RGB color space into a color signal of a device-independent CIEXYZ color space, the method comprising: obtaining importance of weights of wavelengths in a visible band using visual characteristics and lighting characteristics; Obtaining a basis function based on the spectral reflectivity, visibility characteristics, and illumination characteristics by weighting the importance of the weight for each wavelength to spectral reflectivity; Obtaining weights for color signals in an RGB color space using a basis function based on the spectral reflectance, visibility characteristics, and illumination characteristics; And calculating a conversion coefficient when converting from Weight to CIE XYZ by using a basis function based on the spectral reflectance, visibility characteristics, and illumination characteristics. 상기 시감과 조명을 고려한 분광반사도 SC(λ)는 하기 식으로 결정되는 것임을 특징으로 하는 색보정방법.Spectral reflectivity SC (λ) in consideration of the luminous and illumination is a color correction method, characterized in that determined by the following equation. SC(λ)=S(λ)*C(λ)SC (λ) = S (λ) * C (λ) C(λ)= C (λ) = 여기서, C(λ)는 파장별 가중치의 중요도를 나타내는 파장함수이고, E(λ)는 광원의 분광 파워 분포를 나타내고, x(λ), y(λ), z(λ)는 1931 CIE 표준관측자함수임.Here, C (λ) is a wavelength function indicating the importance of the weight of each wavelength, E (λ) is the spectral power distribution of the light source, x (λ), y (λ), z (λ) is the 1931 CIE standard observer Function 기기종속적인 RGB 색공간의 색신호를 기기독립적인 CIEXYZ 색공간의 색신호로 변환시키는 색보정장치에 있어서, 가시대역의 파장별 가중치의 중요도 및 조명특성을 분광반사도에 가중시켜 시감특성 및 조명특성에 기초한 기저함수에 상응하는 변환계수를 저장하는 메모리; 상기 메모리에 저장된 변환계수를 참조하여 RGB 색공간의 색신호에 대한 가중치를 구하는 RGB-to-Weihts 변환부; 및 상기 RGB-to-Weihts 변환부에서 출력되는 가중치를 입력하여 CIEXYZ 색공간의 색신호를 출력하는 Weights-to-CIEXYZ 변환부를 포함하는 색보정장치.In the color correction device for converting the color signal of the device-dependent RGB color space into the color signal of the device-independent CIEXYZ color space, the importance and illumination characteristics of the weight of each visible band are weighted to the spectral reflectance to A memory for storing a transform coefficient corresponding to the basis function; An RGB-to-Weihts conversion unit for obtaining a weight for a color signal of an RGB color space by referring to a conversion coefficient stored in the memory; And a Weights-to-CIEXYZ converter configured to input a weight output from the RGB-to-Weihts converter to output a color signal of the CIEXYZ color space. 제3항에 있어서, 상기 시감과 조명을 고려한 분광반사도 SC(λ)는 하기 식으로 결정되는 것임을 특징으로 하는 색보정장치.4. The color compensating device according to claim 3, wherein the spectral reflectance SC ([lambda]) in consideration of the visibility and illumination is determined by the following equation. SC(λ)=S(λ)*C(λ)SC (λ) = S (λ) * C (λ) C(λ)= C (λ) = 여기서, C(λ)는 파장별 가중치의 중요도를 나타내는 파장함수이고, E(λ)는 광원의 분광 파워 분포를 나타내고, x(λ), y(λ), z(λ)는 1931 CIE 표준관측자함수임.Here, C (λ) is a wavelength function indicating the importance of weight for each wavelength, E (λ) is the spectral power distribution of the light source, and x (λ), y (λ), z (λ) are 1931 CIE standard observers. Function ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940017099A 1994-07-15 1994-07-15 Color correcting method and device KR970009063B1 (en)

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KR970009063B1 KR970009063B1 (en) 1997-06-03

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020095867A (en) * 2001-06-16 2002-12-28 이희만 A Motion Capture System using Color Wavelength
KR100727839B1 (en) * 2001-04-16 2007-06-14 삼성테크윈 주식회사 Digital camera for adjusting colors using an image pickup device
KR100932881B1 (en) * 2004-06-09 2009-12-21 간사이 페인트 가부시키가이샤 Method and apparatus for generating and displaying change color

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100727839B1 (en) * 2001-04-16 2007-06-14 삼성테크윈 주식회사 Digital camera for adjusting colors using an image pickup device
KR20020095867A (en) * 2001-06-16 2002-12-28 이희만 A Motion Capture System using Color Wavelength
KR100932881B1 (en) * 2004-06-09 2009-12-21 간사이 페인트 가부시키가이샤 Method and apparatus for generating and displaying change color

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