• Journal of Broadcast Engineering
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• v.18 no.4
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• pp.647-650
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• 2013

HEVC RExt(High Efficiency Video Coding Range Extension) set a goal to support RGB/YUV 4:2:2 4:4:4 color sampling and over 10 bit-depth images. Unlike the previous 4:2:0 color sampling images, RGB images have the high correlation in inter-color planes. Using this characteristic, some methods which are contributed in JCT-VC standardization meetings estimate the pixel values of inter-color plane. But when we use the estimation of inter-color plane in RGB images, high frequency components of RGB images are caused to reduce the coding efficiency because they usually have the low inter-color plane correlation. Therefore, in this paper, we propose an adaptive low pass filtering method in the inter-color plane estimation. Using this method, we can improve the estimation efficiency of inter-color plane in RGB images. The experimental results with HEVC RExt RGB test sequences show that the proposed method has 0.6% BD(Bjontegaard Distortion)-rate gain and some increased complexity compared to the previous inter-color plane estimation method.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.06a
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• pp.16-19
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• 2013

화이트 밸런스를 유지해야 하는 이유는 입력 이미지의 컬러 밸런스와 동질의 화질 유지를 위하거나, 혹은 이미지를 개선할 때 화질 균일 성을 유지하기 위함이다. 그러나 기존 컬러 개선 방식들은 화이트 밸런스 보존에 관계없이 컬러 개선이 이루어지기 때문에 컬러 개선 전과 후의 화이트 밸런스가 다르게 나타난다. 이 논문에서는 색 순응 변환을 이용하여 화이트 밸런스를 보존하면서 자연스러운 컬러 이미지 개선 및 컬러 측정 알고리즘을 제안한다. 그 결과는 제안된 알고리즘은 Color Naturalness Index 와 Color Colorful Index 라고 풀리는 객관적 방법뿐만 아니라 주관적인 방법 에서도 개선됨을 확인하였다. 알고리즘의 복잡도는 낮으므로 현실 어플리케이션에서도 유용하게 이용될 것이다.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.1030-1033
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• 2006

The efficiency stabilization and the color coordinates in blue organic light-emitting devices (OLEDs) with a double emitting layer (DEL) consisting of 4,4'-Bis(carbazol-9-yl)biphenyl (CBP) and 4,4'-Bis(2,2-diphenyl-ethen-1-yl)diphenyl were investigated. The efficiency of the OLEDs with a DEL did not significantly change with an increase in current density. The Commission Internationale de l'Eclairage coordinates of the OLEDs with a DEL 11 V were (0.150, 0.137), indicative of a deep blue color.

• 한국정보디스플레이학회:학술대회논문집
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• 2009.10a
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• pp.697-699
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• 2009

Optical properties of white organic light-emitting devices (WOLEDs) fabricated utilizing a phosphor layer acting as a color conversion layer were investigated. The WOLEDs were achieved due to the enhancement in the color conversion efficiency of the phosphor layer, and the chromaticity coordinates of WOLEDs were (0.29, 0.33).

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11a
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• pp.735-738
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• 2002

휘도 신호만을 이용한 흑백 TV 에서부터 오늘날의 디지털 HDTV 에 이르기까지의 TV 시스템에서 사용되어 온 영상 신호의 생성, 전송 및 재생 방법은 HDTV, 디지털 시네마 등 영상 시스템의 획기적인 발전과 더불어, 보다 고선명, 고화질을 요구하게 되었다. 본 논문에서는 기존의 TV 시스템에서의 영상재생 결과와, constant luminance방법에 의한 영상 재생 결과를 관찰자 평가 실험을 통해 비교 분석한 데이터를 제시한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.06a
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• pp.49-50
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• 2011

In this paper we collect data concerning sleep environments in a bedroom and analyze the relationship between the collected condition data and sleep. In addition, this paper detects scene changes from the subjects in a sleeping state and presents the physical conditions, reactions during sleep, and physical sensations and stimuli. To detect scene changes in image sequences, we used color histogram for the difference between the preceding frame and the current frame. In addition, to extract the tossing and turning for different situations, the subjects were instructed to enter the level of fatigue, the level of drinking, and the level of stomach emptiness.

• Journal of the Optical Society of Korea
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• v.19 no.1
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• pp.29-37
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• 2015

The wavefront printer records a volume-reflection hologram as a two-dimensional array of elemental holograms from computer-generated holograms (CGHs) displayed on a spatial light modulator (SLM). The wavefront coming from the object is extracted by filtering in the spatial-frequency domain. This paper presents a method to improve color reproduction in a wavefront printer with spatial division of exposures at primary colors, by adaptive partitioning of the SLM in accordance with the color content encoded in the input CGHs, and by the controllable change of exposure times for the recording of primary colors. The method is verified with a color wavefront printer with demagnification of the object beam. The quality of reconstruction achieved by the proposed method proves its efficiency in eliminating the stripe artifacts that are superimposed on reconstructed images in conventional mosaic recording.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.4 no.1
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• pp.13-16
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• 2003

We implanted $N^+ion$ into TiO$_2$/Ti substrates with 70 keV by varying dose of 0, 2, 5, and $10{\times}10^{17}/cm$^2$$. In addition, $N^+ion$implanted TiO$_2$ specimens were annealed at $600^{\circ}C$ for 2 hours in Atmosphere. We investigated the color evolution, surface roughness, and hardness of specimens with doses. We report that the color changed from white into dark-yellow as dose increased. ion implanted surfaces became smooth when they were annealed. Moreover, hardness increased up to 10% when we annealed ion implanted TiO$_2$. Our results imply that we may enhanced titanium color and surface hardness.

• Fashion & Textile Research Journal
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• v.21 no.4
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• pp.509-514
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• 2019

Cotton fabrics were treated with gelatin to enhance dyeability and color strength when using Caesalpinia sappan dye. Gelatin was used as the protein and a pad-dry- cure method was used for the treatment process (2, 4, 6, 8, 10, 12, 14g/l concentration). Pretreated fabrics were mordanted with 10% alum. Fabrics were then dyed with freeze-dried sappan wood water extract powder form. Dyed samples were assessed in regards to dyeing behavior and color fastness. Comparing untreated and gelatin treated samples from the SEM images indicated that the Gelatin treatment (10g/l) resulted in an enhanced surface roughness that was relative to that of untreated cotton. Padding cotton with gelatin at 6g/l concentration afforded dyed fabrics with a 2 times increase in the K/S value over that of untreated fabrics. All dyed samples were red color with a significant enhancement in the sample color strength (K/S) being observed for pretreated samples. pH values favor dye absorption with pH 7 yielding the highest color strength. Dyeing at an elevated temperature resulted in a lower color strength and reddish-dull color. Longer dyeing times created greater color strengths for untreated and gelatin treated cotton. Increased dye concentrations resulted in higher K/S values for both gelatin treated and untreated cotton. As for color fastness, gelatin treated and untreated cotton fabrics dyed with sappan wood extract showed a relatively low rating in washing fastness (color change 1 rating), light fastness (1 rating), and rubbing fastness (wet:1-2, dry:3-4 rating).

• The Journal of the Korea Contents Association
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• v.5 no.3
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• pp.123-131
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• 2005

Among the digital halftoning, the error diffusion halftoning gives better subjective quality than other halftoning techniques. But it also makes edges of objects blurred. To overcome the defect, this paper proposes the modified error diffusion halftoning algorithm to enhance the edges using the spatial perceptual properties of the human visual system. Using the properties that the human eyes perceive not the pixel's luminance itself but the local average luminance and the information that human eyes perceive spatial variation, the proposed method computes information of edge enhancement(IEE). The IEE is added to the quantizer's input pixel and feeds into the halftoning quantizer. The quantizer produces the halftone image having the enhanced edge. Also this paper proposes the technique that the coefficients of the error diffusion filter are adapted according to the correlation among color components. The computer simulation results show that the proposed method produces finer halftoning images than conventional methods due to the enhanced edges. And the proposed method also preserves similar in edges to original image and reduces some defects such as color impulse and false contours.