• KSTLE International Journal
• /
• 제8권1호
• /
• pp.1-6
• /
• 2007

Chromatic device was developed using light emitting diodes, optic fibers and photodiodes. Chromatic ratio and total contamination parameters based on transmitted light intensity in Red, Green, and Blue wavelengths were used for oil chemical and particulate contamination assessment. Chromatic ratio criterion was found independent of the particulate contamination of oil; but depended on chemical degradation, being more sensitive for synthetic than mineral hydraulic oil. Total contamination index of the sensor depended on both the chemical degradation and particulate contamination of the oil; being most sensitive in blue wavelength, and least in the red. Test results for synthetic hydraulic oils monitored corroborated with results of other tests such as viscosity, total acid number, elemental optical emission spectroscopy, particulate counts and UV-VIS photospectrometry. Chromatic ratio showed a clearer indication of oil degradation, compared to key monitoring parameters such as total acid number, viscosity and particle counts. The results showed that these parameters are effective criteria for the condition monitoring of synthetic hydraulic oils.

• 한국멀티미디어학회논문지
• /
• 제18권9호
• /
• pp.1027-1038
• /
• 2015

For last several decades, the color correction methods have been proposed for HDR(high dynamic range) images. However, color distortion problems take place after correcting the colors such as halos, dominant color as well known. Accordingly, this article presents a novel approach in which the method consists of tone-mapping method and cone response function. In the proposed method, the tone mapping method is used to improve the contrast in the given HDR image based on chromatic and achromatic based on the CIEXYZ tristimulus value, expressed in c/m². The cone response function is used to deal with mismatch between corrected image and displayed image as well as to estimate various human visual effects based on the CMCAT2000 color appearance model. The experimental results show that the proposed method yields better performance of color correction over the conventional method in subjective and quantitative quality, and color reproduction.

• 대한전자공학회논문지SP
• /
• 제41권1호
• /
• pp.21-28
• /
• 2004

내용기반 영상검색 분야에서 색, 질감, 모양 등과 같은 영상의 시각적인 내용을 표현하기 위하여 수치화한 특징들이 많이 제안되었다. 이런 특징들은 모두 독립적이라고 가정하기 때문에 한 특징 벡터를 추출할 때는 다른 특징들과의 상관성을 전혀 고려하지 않는다. 이 논문에서는 색과 질감 사이의 관계를 고려하여 새로운 CCE(channel color energy) 특징을 제안한다. 자연 영상을 대상으로 한 실험결과를 분석한 결과 제안하는 방법이 정규 가중거리 비교 방법과 SCFT(sequential chromatic Fourier transform) 기반 색 질감 방법에 비해 우수한 성능을 보이는 것을 확인할 수 있었다.

• 한국멀티미디어학회논문지
• /
• 제13권5호
• /
• pp.674-683
• /
• 2010

일반적으로 표준 시 환경에서의 정확한 색재현을 위해 측색적으로 우수한 성능의 디스플레이 제품들이 개발되고 있다. 그러나 디스플레이를 볼 때 실제 시 환경은 조명과 디스플레이 자체의 광에 영향을 받게 되고, 보여지는 색은 실제 의도된 색과 달리 보이게 된다. 따라서 재현된 색이 표준 시 환경 하에서의 색과 같아 보이는 대응색을 예측하는 것은 매우 중요하다. 인간 시각의 색 순응 특성을 고려하여 대응색을 재현하는 여러 가지 방법들이 제안되었다. 그러나 이 모델들은 다양한 휘도 레벨과 색도 대한 순응 화이트 점 예측에 큰 오차를 보이고 있다. 본 논문에서는 다양한 조명의 색도와 휘도 하에 변하는 시각의 순응하는 화이트 점을 예측하는 모델을 제안하였다. 제안한 모델은 조명의 휘도에 따른 두 좌표의 유클리디안 거리의 비로 모델링되며, 순응 화이트 점은 주변 휘도에 대해 S자 형태의 곡선을 따라 변화되는 특성을 갖는다. 제안한 모델은 Hunt의 휘도에 대한 순응 화이트 실험 데이터로부터 최적의 계수를 구하였고, 이는 다양한 시 환경에서 대응색을 찾는 색 순응 모델에 적용될 수 있다. 제안된 눈의 순응 화이트 모델은 디스플레이 장치의 기준 백색을 결정하는 이론적인 기준으로 사용될 수 있다.

• 한국컴퓨터정보학회논문지
• /
• 제19권5호
• /
• pp.19-25
• /
• 2014

본 논문은 평면상의 거리가 1인 인접 정점들에 대해 서로 다른 색을 칠할 경우 최대로 필요한 색인 채색수를 찾는 문제를 연구하였다. 지금까지 채색수 상한 값은 $4{\leq}{\chi}(G){\leq}7$로 알려져 있으며, Hadwiger-Nelson은 ${\chi}(G){\leq}7$, Soifer는 ${\chi}(G){\leq}9$를 제안하였다. 먼저, 최소로 필요로 하는 채색수를 구하는 알고리즘을 제안하고, Hadwiger-Nelson의 정육각형 그래프를 대상으로 채색수를 구한 결과 ${\chi}(G)=3$이 될 수 있음을 보였다. Hadwiger-Nelson의 정육각형 그래프를 12개 인접 정점으로 가정할 경우 ${\chi}(G)=4$를 구하였다. 또한, Soifer의 8개 인접 정점 정사각형 그래프에 대해 채색수를 구한 결과 ${\chi}(G)=4$임을 보였다. 결국, 제안된 알고리즘은 최소 차수 정점부터 색을 배정하는 단순한 다항시간 규칙을 적용하여 평면의 최대 채색수는 ${\chi}(G)=4$임을 제안한다.

• 복식
• /
• 제59권4호
• /
• pp.67-81
• /
• 2009

This study aims to characterize the effect of different combinations of chromatic-achromatic colors and 1:2:3 area-ratio variation of stripe necktie, and gender on the image of male wearer. The experimental materials developed for this study are a set of stimuli and response scales. The stimuli consist of 84 color pictures manipulated with every combination of 12 different colors and 7 different area-ratio. The 7-point scale designed for visual evaluation of image formation included 26 bipolar adjectives. The subjects were 2016 undergraduate students in Gyeongnam, Seoul, Busan, and Daegu areas. The results of this study were as follows. The analyses of images of male wearer in terms of combinations of chromatic-achromatic colors and I :2:3 area-ratio variation of oblique stripe necktie reveal that the concerned factors are of five characteristic dimensions of youth-activity, ability, attractiveness, appeal, and warmness. In addition, it has been found that individual images of male wearer are affected by observer's gender as well as combinations of chromatic-achromatic colors and 1:2:3 area-ratio variation of stripe neckties and that those images vary with every combination of each factor. The study results are highly expected to be used as useful sources in developing necktie designs.

• 패션비즈니스
• /
• 제15권3호
• /
• pp.51-66
• /
• 2011

The purpose of this study is to investigate the effect of the traditional color sentiment on the contemporary clothing color by studying the pictures of street fashion of Dalian in China, in view of the clothing color of women in their 20-30 years of age having highest purchasing power, along with traditional Chinese color. The clothing color is various in frequency depending on the items in street fashion. Due to the seasonal impact of summer, the most frequent item was one-piece dress with the Multi of various color patterns, followed by White, Black, PB, R and B category. In the top color, the White was most prevalent color due to the seasonal factor, followed by Black, Grey, Multi, R, Y, RP category. Achromatic color is more dominant with the ratio of 7:3, comparing with its counterpart, which consists of R and Y category of V, B, P, VP tone. In the bottom color, Dp tone of PB shows most high frequency, followed by Black. This results illustrate that Chinese women prefer blue jeans and to be looked as slimmer by using of the dark colors. In the accessories, colors of bags and shoes show different results. The bag colors show the high frequency of Dk tone, YR category, and the chromatic colors are little bit dominant than achromatic ones with the ratio of 5.3:4.7. On the contrary, the shoes colors show the highest frequency in Black, the achromatic colors are more dominant than chromatic ones with the ratio of 6.6:3.4. These results somewhat diverge from the international color trend. Color trend in Dalian street fashion in which the high frequency of V tone is observed through all the colors of the items followed by P, VP, Lgr tone in sequence. In the light of Chinese traditional color preference, this result denotes that the traditional color preferences of red, yellow are still affecting the contemporary color choices of clothing in Chinese women. The high incidence of PB category in the bottom and one-piece dress does not seem to have its origin form traditional Chinese color sentiment.

• 패션비즈니스
• /
• 제13권6호
• /
• pp.31-44
• /
• 2009

This study aims at clarifying the influence that color, tone, dot size, the combination of area ratios exercise on the harmony in dot necktie, and revealing the harmony differentiation according to the cues of various factors for pattern design. The conclusion is drawn as below, in the result that the cues which can exercise influence on the harmony of dot necktie, was analyzed by 54 stimuli. In the result of analysis of variance in order to clarify the influence which color, tone, dot size, and color area ratio exercise on dot necktie harmony, color and dot size operate appeared to be independent cues which exercise significant influence with main effect. In the result of the harmony difference analysis on color, tone, dot size, and color area ratio combination by multiple comparison, the cyan color in vivid tone was estimated to be most inharmonious in the analysis by color and tone. Viewing the harmony difference according to color and dot size, the dot size of 0.5cm in cyan was perceived to be most harmonious. Viewing the harmony difference according to color and color area ratio combination, both magenta and cyan were estimated to be positive, regardless of area ratio combination, and particularly, the case that the background was in cyan and the dots were in grey was perceived more harmonious compared to the contrary case. Viewing the harmony difference according to tone and dot sizes, the case when the dot sizes were 0.5cm, was perceived to be most positive, regardless of tone. Viewing the harmony difference according to color area ratio combination and tone, the case that the chromatic colors, cyan, magenta, and yellow was used as background, was estimated to be more harmonious, compared to the case that the achromatic color, grey was used as background. Viewing the harmony difference according to dot size and color area ratio combination, in case that the dots were in chromatic color and the background was in grey, the harmony showed difference by dot size, and the case of the dot size of 0.5cm was estimated to be most harmonious.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
• /
• pp.1795-1800
• /
• 2006

HDTV will be the future TV system. LCD TV, accompanying with the progress of HDTV, rapidly grows up these years. Beside, several technologies and fabricating techniques have greatly enhanced resulting high quality display is easy to achieve. This paper will discuss video decoder, color filter, and backlight which is to know their functions, operating methods, and the chromatic and optical characteristics.

• 전자공학회논문지CI
• /
• 제45권3호
• /
• pp.149-159
• /
• 2008

참조 영상을 이용하여 영상의 분위기를 전환하고자 할 때, 영상의 분위기에 영향을 주는 요소 중 하나인 색을 이용하여 영상이 가지는 분위기를 변환한다. 색을 변환할 때, 국부적인 색상의 특징을 반영하기 위해 입력 영상의 화소에 대하여 색인을 하는데 낮은 채도 상에서는 색상의 식별력 저하로 인해 부적절한 색인의 색상 항목으로 색인이 되는 문제가 발생한다. 따라서 본 논문에서는 유채색과 무채색을 분리하여 처리함으로써, 낮은 채도 상에서의 잘못된 색인이 일어나지 않도록 제한하는 기법을 제안한다. 제안하는 기법은 채도의 문턱치를 이용하여 유채색과 무채색을 구분하는 단계, 구분된 화소들을 실린드리컬 거리(Cylindrical metric)를 이용하여 11가지 색상 항목(Index color)으로 색인을 하는 단계, 각 색상 항목의 우선순위 결정하고 평균과 표준편차를 구하는 단계, 마지막으로 Lab 색 공간에서 색을 변환하고 영상의 잡음과 의사 윤곽선(pseudo-contour)을 제거하기 위한 후처리 단계의 4단계로 구성된다. 실험결과를 통해 제안하는 기법은 낮은 채도 상에서도 유채색과 무채색이 잘 분리되어 색인이 되었으며 원본 영상의 색이 참조 영상의 색으로 자연스럽게 변환된 결과를 얻을 수 있음을 확인하였다.