• 전자공학회논문지 IE
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• v.46 no.3
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• pp.12-18
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• 2009

In this paper, we developed white balance correction processor for Full Color LED Display System which could be display uniformity color and soft light by adjusting brightness of red, green, blue pixel, individually. This processor correct brightness by calculating operating current of each pixel(red, green, blue LED) on the basis of characteristic curve of LED device when we named "a" as a specific characteristic value, "b" as a brightness correction value according to using time, "X" as a operating current value, and "Y" as brightness value. As the results, we solved the reduction problem of brightness for long used LED devices, according to increase entire mean of brightness value by adjusting "b" value from the brightness characteristic function.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.41 no.5
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• pp.20-25
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• 2009

Residual extractives had a noticeable impact on the brightness of unbleached hardwood kraft pulps (trembling aspen). The brightness-impacting extractives were effectively removed by oxygen delignification. In addition, oxygen delignification was more effective in removing chromophores in hardwood unbleached kraft pulps than in those of softwood (loblolly pine). The residual extractives in unbleached hardwood kraft pulps also affected the pulp color, primarily redness and the L value. These redness-related extractives in unbleached hardwood kraft pulps were also effectively removed by oxygen delignification. There were no significant color differences between untreated and solvent-extracted oxygen-delignified aspen kraft pulps. The residual extractives in unbleached and oxygen-delignified softwood (loblolly pine) kraft pulps did not have a significant impact on either brightness or pulp color.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.52 no.2
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• pp.98-104
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• 2003

This paper proposes the design of a multi-color lamp using high brightness RGB LEDs for color variation. Appropriate number of RGB LEDs is so chosen according to the color mixing theory that the overall LEDs represent a color temperature of 6500K. Also, the chosen RGB LEDs are suitably arranged by using an optical design program. The lamp has an internal controller circuit, so it can be directly connected to the existing incandescent lamp socket. It's main body is comprised of two PCB layers. The upper layer contains 44 LEDs and the lower one has a simple microcontroller-based PWM control circuit. The lamp has functions of both ON/OFF control and PWM control, and enables color variation of over 100,000 colors and of more than 10 patterns.

• The Journal of the Acoustical Society of Korea
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• v.17 no.1
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• pp.24-30
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• 1998

본 논문에서는 기존의 단방향 컬러 스페이스 컨버터(Color Space Converter)를 양방 향으로 변환하는 것뿐만 아니라, 기존의 디코더, 엔코터 및 모니터 등이 가지고 있는 Brightness 기능을 갖도록 변환 행렬 계수를 임의로 조정할 수 있는 컬러 스페이스 컨버터 를 설계하였다. 이러한 변환 계수 자체를 조정하여 휘도 및 색차 신호에 변화를 주는 방법 은 새롭게 제안한 방법으로 계수의 조정은 ROM형태를 이용하여 향후 인터페이스 부분을 부가하여 소프트웨어적으로 제어할 수 있도록 설계하였다. 본 논문에서 제안한 Brightness 기능을 갖는 컬러 스페이스 컨버터는 저가의 멀티미디어 비디오 관련 시스템을 구현할 수 있는 장점을 가지고 있다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.7
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• pp.1708-1714
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• 2010

In this paper, the full color LED billboard or a general quality improvement methods of quality gamma correction, brightness, and brightness adjustment, etc., regardless of the overall color of images uniformly bright or dark have been taken care of. The video itself, but simply expressed as a uniform brightness of a certain size, how to adjust the brightness of input video signal does not reflect the characteristics of the entire screen with just a lighter or darker line is only feeling was brought. So, unlike conventional video transmission system with new LED display technology in the histogram analysis of image data is input by the input image data by determining the luminance values of the attributes are reflected, as appropriate based on the histogram of the distribution of brightness values By controlling the LED display is expressed in the uniform image can improve the brightness control, histogram distribution of the image as full color billboards driven processing technology is proposed.

• Textile Coloration and Finishing
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• v.20 no.6
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• pp.51-62
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• 2008

The purpose of this study was to check color change depending on dyeing conditions when silk fabrics was dyed with gromwell and to investigate mordant effect when synthetic tannin was used as a mordant. First, when silk fabrics were dyed with gromwell, the change of color, brightness and chroma were examined by measuring K/S value, a, b value, L value and C value depending on dyeing condition. Second, color, brightness and chroma differences which appeared after mordanting with synthetic tannin were investigated and muti-functional mordanting effect was confirmed with dyeing fastness, antibiosis. As a result of color analysis of gromwell, it was proved that the main pigment of gromwell was shikonin. Color was red purple at pH 3 when silk fabrics were dyed with gromwell. But It became greenish and bluish as temperature rose and time passed by. And it grew reddish and yellowish as concentration level reached higher. The color became purple at pH 5 and purple blue at pH 7. Both at pH 5 and pH 7, it became greenish and yellowish, as temperature went up and time ran by. And it became reddish with concentration increasing. Brightness and chroma decreased with temperature and concentration increasing as well as time passing by. After mordanting with synthetic tannin, the color became less reddish at pH 3 and reddish-yellowish at pH 5 and pH 7. The brightness increased and the chroma decreased. At all pH, the color, the brightness and the chroma became similarly by synthetic tannin mordanting. Dyeing fastness of synthetic tannin mordanted fabric was higher than that of non-mordanted fabric. Especially, wet fastness at pH 3 improved from 1 grade before synthetic tannin mordanting to $3{\sim}4$ grade after tannin mordanting. Antibiosis was improved by gromwell dyeing and synthetic tannin mordanting.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.39 no.4
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• pp.323-327
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• 2013

Various indicators representing skin characteristics such as skin hydration, sebum excretion rate, lightness, and pH are different depending on environmental and genetic factors. However, they are absolute skin indicators and are different from skin characteristics that a person recognizes. Based on this fact, many recent studies have been mainly conducting researches on perspective changes according to changes of absolute skin. This study was proposed not only to find out differences on skin colors of asian by nations, but also to find out whether there was any difference in skin brightness they perceive depending on actual skin color changing. As many as 410 subjects of three Asia nations were participated in this study, and investigated their responses on skin brightness using questionnaire, which was answered their skin color in three different levels. It was also were analyzed how actual skin brightness were changed depending on their perceived skin color changes of subjects. There was a trend showing that the brightness of the actual skin color was increased when participants felt their skin color got brighter regardless of their nationalities. However, there were some differences in color between perceived color and actual color. In addition, there was a different aspect by nations in changes of skin redness and skin yellowness. In conclusion, it was revealed that factors which help people to perceive their own skin brightness were not based on absolute skin brightness, but on different criteria depending on where they are from.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.37 no.5 s.113
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• pp.8-14
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• 2005

The difference of whiteness, brightness and lightness was clearly explained in this paper by use of a tinting dye and a fluorescent whitening agent which are commercially widely used to make paper look whiter. Other optical properties such as tint, color shade, and color difference were also discussed. It is concluded that in comparing two tinting dyes, lightness (L*) is the most important property to be compared, while whiteness data should be used in caution in order not to surpass its significant range, and a*, b* values can also be used to find the change of color shades together with ${\Delta}E$ as color difference. In comparing two fluorescent whitening agents, whiteness or brightness values are most important to be compared, but lightness values are not suitable for this purpose; a*, b* and color difference ${\Delta}E$ can also be referred, but with less significance.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.62 no.9
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• pp.1290-1296
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• 2013

The light intensity which represents the relative amount of brightness and darkness is very important feature to discern the color hue and its relevant information. With this aim, we devise a new optical system and method to analyze the light intensity. Our suggested system including a phototransistor and white-high-brightness chip light-emitting diode intend estimate the contrast value utilizing Image Research Institute(I.R.I.) Hue & Tone samples which includes 120 color sheets arranged by the color hue and tone. As a result, we confirmed that the brightness of the color checker can be accurately estimated by a high-brightness light-emitting-diode optical system.

• Journal of Convergence for Information Technology
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• v.11 no.12
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• pp.90-96
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• 2021

In this paper, we designed manufactured and design an integrated interface control unit that has compatibility with brightness control unit, color control unit, and existing control unit. As the implementation method the standard of DVI/HDMI transmission method is applied to the data transmission method, and the Sil 1169 IC is used as the applied IC. Brightness control is programmed to have eight levels of brightness control using the AT89C2051. Also, EPM240T100C5 IC was used for image and dimming data processing. As a result, it is compatible with the control unit using the DVI/HDMI transmission method manufactured by each company and can reproduce clear high quality full HD video according to the surrounding brightness through the full color LED display system.