• Journal of the Semiconductor & Display Technology
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• v.23 no.2
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• pp.23-27
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• 2024

Underwater images are typically degraded due to color distortion, light absorption, scattering, and noise from artificial light sources. Restoration of these images is an essential task in many underwater applications. In this paper, we propose a two-phase deep learning-based method, Underwater Deep Curve Estimation (UWDCE), designed to effectively enhance the quality of underwater images. The first phase involves a white balancing and color correction technique to compensate for color imbalances. The second phase introduces a novel deep learning model, UWDCE, to learn the mapping between the color-corrected image and its best-fitting curve parameter maps. The model operates iteratively, applying light-enhancement curves to achieve better contrast and maintain pixel values within a normalized range. The results demonstrate the effectiveness of our method, producing higher-quality images compared to state-of-the-art methods.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.05a
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• pp.3-6
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• 2008

The purpose of this study is to investigate the luminous environment of fluorescent lamp and LED lamp in a office space for various color temperature by subject response test. For this, three different color temperatures were tested for the same illuminance level. Based on such test results for various color temperatures of fluorescent lamp and white LEDs, this study is to analyze the preferences of color temperature and light source, and perceptional brightness of each light source and color temperature. Then, this study is to derive the guidelines for the performance of color temperature which are suitable on the purpose and the mood of a office space.

• Journal of the Korean Home Economics Association
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• v.20 no.2
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• pp.37-43
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• 1982

The white color is the main characteristics of the traditional color of clothes. From the historical point of view, the Korean's pattern of wearing Baik-Eui can be found its origin from many people of North-East Asia in ancient time. The beginning of wearing Baik-Eui in Korea was at the age of tribes, and it was delivered to middle age, later on, to modern age near the end of Yi Dynasty. The other charactics of the traditional colors. are summarized as follows: 1. Prefered light color to dark color and light blue was noble and worthy. 2. The kinds of color were not various. 3. Color was native and pure not including grey or other colors. From the economical point of vie, the first thing is that Baik Eui was primitive in ti's color Though some say that wearing Baik-Eui is considered as a kind of worship of the Sun, yet we can also find that the every reason of it is that we had little dyes at that time. Especially the reddish dyeing materials were in short supply, so that had been imported mainly from Japan.

• Korean Journal of Optics and Photonics
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• v.9 no.1
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• pp.38-46
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• 1998

In this study, the color reproduction algorithm considering both of luminace and chromaticity of the background light is presented and tested to BT-H 1450 monitor(Panasonic). In the case of neglecting the background effect, the Macbeth ColorChecker's 24 colors are reproduced with the average color difference ${\Delta}E_{ab}^{*}$ more than 9.0. By using this method, the average color difference ${\Delta}E_{ab}^{*}$ is decreased less than 1.0. From this study, we can find that both of luminance and chromaticity of background light are very important factors in the color reproduction on a CRT display.

• Journal of the Optical Society of Korea
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• v.17 no.6
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• pp.506-512
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• 2013

Recently, the color separation issue of wide-spreading white LEDs has attracted attention due to their wide applicability as light sources in direct-lit LCD backlights. These wide-spreading LED packages usually consist of LED chips, a color-conversion phosphor layer, and a light-shaping lens. The technical aspect of this color issue was related to a method for balancing the yellow spectral component emitting from phosphors with respect to the blue one from the LED chip as a function of viewing angle. In this study, we suggested an approach for carrying out quantitative analysis for the color separation problem occurring in wide-spreading LED packages by optical simulation. In addition, the effect of an internal scattering layer on the color uniformity was investigated, which may be considered as a potential solution for this problem.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.9 no.4
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• pp.49-54
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• 1995

This paper is an experimental study on the influence of the demonstration effect by color and light source in show window. This experiment used semantic differentical method in model show window of actual size. The important outcomes of this study are summarized below. 1. In the result by factor analysis, three factors are classified. They are diversity, emotion, lightness. 2. In the study on the influence by light source, incandescence lamp is the most effective light source in every items. 3. In the result of the study on the influence by color source, according to each factor bring out following result ; Green is the most effective in diversity factor and ligthness factor. Yellow is the most effective in emotion factor.

• ETRI Journal
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• v.35 no.5
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• pp.927-930
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• 2013

We propose a visible light communication system in which the color and brightness are controllable. Pulse width modulation and variable pulse position modulation (VPPM) schemes are used to control the color and brightness, respectively. A digital algorithm to decode VPPM signals is suggested and implemented. A seamless transmission is observed in a testbed experiment under various environmental conditions. The proposed scheme can be applied to emotional-lighting-based wireless optical communication.

• Journal of Sensor Science and Technology
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• v.21 no.6
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• pp.429-433
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• 2012

In this paper, we reduced the optical noise interference in a visible light communication system using two color LEDs. In the transmitter, the original and the inverted signals of the transmitted data modulated a red LED and a blue LED, respectively. In the receiver, a differential detector which is composed of two photodetectors and an optical red filter detected the mixed signal radiated from the two LEDs. In an environment that the optical noise from a fluorescent lamp exists, the signal-to-noise ratio in this system was improved by about 20dB compared to that in the conventional system which uses a single LED and a single photodetector.

• Textile Coloration and Finishing
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• v.11 no.6
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• pp.43-50
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• 1999

Lichen had been used as dyestuffs before the discovery of synthetic dyes in Europe and by American Indians. To investigate the dyeability of Korean native lichens, 10 kinds of lichen were collected and colorants were extracted from them by boiling in water and fermenting in ammonia water. Silk fabrics were dyed with lichen extract, then the colour differences of dyed silk fabrics were measured before and after color fastness test. The most part of the lichen extracts(Fc, Hh, Me, Pl, Xm, Pr, Cj, Ld, Ry) dyed silk yellowish or reddish brown. The range of colors were 2.4Y 6.5∼10YR 6/7. Pa extract dyed silk purple(1.25RP 5/6). Color differences of laundered specimen with the silk before laundering were very small, but color of the dyed silks after exposing to light showed big differences with the specimen before exposing to light. The colors of the silks dyed with lichens changed from yellowish or reddish brown to greenish brown by laundering and by exposing to light. But the specimen dyed Pa extract changed from purple to blueish purple by laundering and reddish purple by exposing to light.

• Proceedings of the Korea Contents Association Conference
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• 2009.05a
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• pp.66-69
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• 2009

Dispersion depending on the wavelength of light that is divided, composed of multiple wavelengths of light.Prism and the rainbow is a visible example of the principle of distributed phenomena. RGB 3 Color Dispersion is can't be expressed in detail. 7 kinds of colors of the Visible light area was distributed, this research to solve the problem of how to distribute these to RGB.The spectral representation for 3 Color Dispersion.