• 한국인쇄학회지
• /
• 제16권3호
• /
• pp.97-108
• /
• 1998

Spectral reflectance of the object should be measured to predict the color of object under various illuminants. The spectral reflectance can be represented in a multi-dimension space. Generally the information of inputed image by digital camera and color scanner is represented with 3-dimension color signals such as RGB. In other to predict the color of inputed image under any illuminant, we should be estimated spectral reflectance of the object. In this paper, we described the method to predict spectral reflectance by einenvector using the skin color of printed image, confirmed availability and propriety through experiment. we estimated spectral reflectance of skin color taken by RGB color signals and than reproduced skin color according to various illuminants on CRT.

• 한국측량학회지
• /
• 제13권2호
• /
• pp.163-168
• /
• 1995

색은 칼라 모니터 상에서 삼원색에 대한 수치를 조합하여 나타내는 RGB칼라모델과 명도, 색도, 채도항의 IHS 칼라모델, CMY칼라모델, YIQ 칼라모델 등을 이용하여 나타낼 수 있다. IHS칼라모델은 RGB칼라모델보다 사용자가 색을 수학적으로 평가하여 쉽게 조정할 수 있는 이점이 있다. 본 연구에서는 Landsat TM의 밴드 3,2,1을 조합한 인공위성 영상과 스캐닝한 지도영상을 IHS 변환과 명도 조정 기법을 이용하여 색분해를 통한 재합성을 실시하므로서 천연색 지도 영상을 제작할 수 있었다. 그리고 인공위성영상과 지도영상을 합성할 때 발생하는 문제점과 그 해결방안을 제시하였다.

• 전기학회논문지
• /
• 제58권12호
• /
• pp.2538-2541
• /
• 2009

H.264/AVC High 4:4:4 Intra/Predictive profiles supports RGB 4:4:4 sequences for high fidelity video. RGB color planes rather than YCbCr color planes are preferred by high-fidelity video applications such as digital cinema, medical imaging, and UHDTV. Several RGB coding tools have therefore been developed to improve the coding efficiency of RGB video. In this paper, we propose a new method to extract more accurate correlation parameters for inter-plane prediction. We use a searching method to determine the matched macroblock (MB) that has a similar inter-color relation to the current MB. Using this block, we can infer more accurate correlation parameters to predict chroma MB from luma MB. Our proposed inter-plane prediction mode shows an average bits saving of 15.6% and a PSNR increase of 0.99 dB compared with H.264 high4:4:4 intra-profile RGB coding. Furthermore, extensive performance evaluation revealed that our proposed algorithm has better coding efficiency than existing algorithms..

• Journal of Information Display
• /
• 제10권4호
• /
• pp.164-170
• /
• 2009

The dependences of color gamut size and power consumption on the area ratio of the neutral and green subpixels for the RGB-LED-backlight RGBW LCD were studied, in which the red- and blue-subpixel areas are the same and represent one-quarter of the pixel aperture area. It was found that the color saturation of the RGBW LCD can be improved through the use of a smaller neutral- and green-subpixel area ratio, at the expense of higher power consumption.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
• /
• pp.1073-1076
• /
• 2009

The dependences of color gamut size and power consumption on the area ratio of neutral and green sub-pixels for the RGBW LCD with RGB LED backlit are studied, in which the areas of red and blue sub-pixels are the same and are one quarter of pixel apertu re area. It is found that high color saturation and power saving can be achieved for the proposed RGBW LCD.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2002년도 추계학술대회 논문집
• /
• pp.383-386
• /
• 2002

It is very important to inspect color of printed texture in the textile process. To distinguish the color of the printed texture, RGB color values obtained from a scanner must be transformed to the standard colorimetric system used in the textile industry. It is XYZ color system that is defined by CIE(Commission Internationale do 1Eclairage). The mapping from RGB to XYZ color values is not simple and the scanner has even a positional deviation of RGB colors. In this paper an automatic color inspection method using a general scanning machine is presented. We used a U(neural network) model to map RGB to XYZ and compensate the positional error. In the real experiments, this inspection system shows to get very exact XYZ values from the traditional scanner regardless of the measuring position.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2003년도 추계학술대회 논문집 전기물성,응용부문
• /
• pp.145-147
• /
• 2003

This paper presents a method of improvement of color mixing in an RGB LED white lamp. The deviation from white light after RGB color mixing results mainly from the difference in the ray direction among LEDs. The authors propose a method using tilted lenses covered over each LED to deflect the overall direction of the ray generated from far-sited LEDs toward the center axis of the lamp. The degree of improvement is evaluated using a color discrimination method based on McAdam ellipse.

• Journal of the Optical Society of Korea
• /
• 제18권4호
• /
• pp.345-349
• /
• 2014

A direct-lit color-matching liquid crystal display using a lenticular lens array with grouped lens elements that image linear RGB light sources on the RGB subpixels of a color filter to enhance transmittance is designed, simulated, and fabricated. The RGB LED linear light sources were fabricated using small RGB LEDs in a linear array arrangement, and the lenticular lens array consisted of eight units of the same structure with a gap of 2.19 mm. The optical transmittance of the liquid crystal panel was improved by as much as 240% due to the color matching.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
• /
• pp.85-88
• /
• 2005

A low-cost and high-speed PDP color inspection system can be constructed by using a CCD camera against a colorimeter. Though the inspection can be done using RGB signals obtained by a camera, it has some difficulty to introduce human color sensitivity. Thus, it is quite desirable to convert the RGB values into the XYZ values that can be compared to the values of a colorimeter. Accordingly, the current study proposes a color conversion method that can analytically calculate the RGB-to-XYZ conversion matrix by utilizing the RGB primaries and the reference white. Experiments on Macbeth colorchecker colors showed that the average color difference between the converted XYZ values of the proposed method and the measured XYZ values of a colorimeter is much below the threshold of distinguishing two adjacent color patches.

• 한국산학기술학회논문지
• /
• 제16권3호
• /
• pp.2151-2157
• /
• 2015

색 정보 전달의 호환성을 위해 채택된 sRGB 색공간은 수많은 컴퓨터 시스템 및 주변 멀티미디어 장치들에 효율적인 색 정보 전달을 가능하게 한 표준이다. 하지만 현재 우리가 일반적으로 사용하고 있는 디스플레이 모니터는 sRGB의 표준과 다른 비 표준 삼원색과 감마 특성을 가지고 있다. 본 논문에서는 비표준 디스플레이를 sRGB 표준의 화상 색에 좀 더 가까운 색을 재현하기 위한 오차 보정 행렬을 제안한다. 제안한 색도 오차 보정 행렬을 이용한 방법을 적용한 실험 결과, 비 표준 디스플레이에 재현된 영상에서의 색 재현 오차가 감소하는 것을 확인할 수 있다.