• 전자공학회논문지T
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• 제35T권2호
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• pp.20-27
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• 1998

HSV색공간을 이용한 칼라화상의 클러스터링 및 색차평가에 관한 연구(A Study on Clustering and Color Difference Evaluation of Color Image using HSV Color Space) pp.20~27 칼라화상을 화상부호화, 리모트 센싱, 컴퓨터비젼 등의 분야에 이용하기 위해서는 인간이 감각적으로 취급하기 쉬운 색공간으로 화상정보를 변환시켜야 한다. 색상, 명도, 채도를 근거로한 Munsell색공간은 인간의 색지각과 영역간의 색차가 일치하는 특징으로 인하여 칼라화상의 클러스터링에 이용되고 있다. 본 논문에서는 RGB입력화상을 ${L^*}{a^*}{b^*}$ 균등색공간으로 변환하고, 색지각과 일치되는 HSV색공간으로 근사화시킴으로써, 각 좌표축을 중심으로 클러스터링과 그 색차를 평가한다. 자기수렴 특성을 갖는 ISO DATA 알고리즘을 응용하여 HSV칼라화상의 영역을 분할하고, 과분할된 영역을 통합하는 방법을 제안하였다. 두 종류의 입력화상에 대한 클러스터링을, 색차를 기본으로 한 임계값에 따라 수행하므로써 화상내용의 복잡함에 대응하는 양호한 영역분할 결과를 제시하였다.

• 한국의류학회지
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• 제32권10호
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• pp.1629-1639
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• 2008

The purpose of this study is to research the similarity and difference of color application in the culture of Korea and Japan. The subject of this research is the costume color of Changgeuk and Kabuki. This survey analyzes Munsell's 3 attributes(Hue, Value, Chroma), tone, and 3D color analysis by extracted color data. And representative color according to Obangsaek is proposed. The results of this study are as follows: 1. High chroma red in Kabuki costume is more used as symbolic color(passion and luxurious) in order to show character's personality than that in Changguek costume. 2. Low chroma YR color(no-dyeing color) in Changgeuk costume much more used because of Korean white robe preference and eco-friendly thinking. But high chroma yellow is restrictive color for symbolic color of emperor in Korea and Japan. 3. Blue is most frequently used in both costumes because blue is encouraging color by the theory of exponents of the five elements doctrine. 4. White in Korean Changguek costume is more used for white robe preference thinking, but black in Kabuki costume is much more used for symbol of power in Japan. The similarity of Korean and Japanese cultural color is to use much Obangsaek, less Ogansaek by the theory of exponents of the five elements doctrine, but the difference of Korean and Japanese cultural color is to use color differently according to preference thinking system.

• 한국가구학회지
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• 제26권3호
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• pp.262-266
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• 2015

This study was carried out to analyze the surface color change according to the weathering time. The surface color of material was one of evaluation indexes in exposure experiment. For the purpose, accelerated weathering test was performed with wood. The weathering time level was composed with 0, 500, 1000, 1500 and 2000 hours and color difference was estimated with the color difference meter. The surface color was changed to 500 hours that lightness and redness were decreased and yellowness was increased. However it did not changed after 500 hours. It means that the surface color could be the evaluation index of deterioration of the wood but it means very little after certain time.

• Restorative Dentistry and Endodontics
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• 제25권1호
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• pp.71-77
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• 2000

The color of an esthetic restorative material is controlled primarily by thickness of the material and background color. Although the effects of the two factors on the color coordinates of esthetic dental materials have been reported, the mechanism has not been clarified well enough to explain the effects quantitatively. The purpose of this study was to evaluate the effect of thickness and background color on the color of tooth colored restorative materials quantitatively. One hundred sixty samples were fabricated from two commercial light-cured composite resins and two commercial compomers. The color characteristics and changes in the color coordinates were measured by a tristimulus colorimeter (Model TC-6FX, Tokyo Denshoku Co. Japan) using the CIELAB system. The results were as follows: 1. As thickness increased from 1.0 to 4.0mm, values of $L^*$ $a^*$ $b^*$ changed irregulary for white and dentin color background, but showed no obvious difference in color for black background. 2. The colors of composite resins and compomers were significantly influenced by background color. 3. The color difference was recognized even the same shade name in four representative kinds of composite resins and compomers. 4. As thickness changed, values of color difference for same products and same background color showed constancy, but showed difference for different background color.

• 한국의류산업학회지
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• 제5권1호
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• pp.43-52
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• 2003

The purpose of this study was to investigate the characteristics of traditional blue color between Korean and Japanese traditional costumes. Korea and Japan as the neighboring country of geographically and historically, but showed obvious difference in traditional color. In this study we investigated the blue color characteristics that appear on Korean and Japanese traditional costumes. We researched the characteristics of blue color on color names and color tones through the old Korean and Japanese literatures, costume remains and restoration dyeing fabrics. This study researched the Chosun Period in Korea and Edo Period in Japan. The results of this study Were as following; Many differentiation colors appeared in Chosun and Edo period than former ages. These differentiation colors were made giving differences gradually in basic color, hue, value and chroma. The blue color names appeared 40 names in Chosun Period and 57 names in Edo Period. In these blue color names of Chosun and Edo Period, the common color name was not more 'indigo'. The most highly appearanced blue color hues of costume remains in Chosun and restoration dyeing fabrics in Edo Period were blue and purplish blue. The most highly appearanced blue color tones were dull and moderate. By result of preceding descriptions, the characteristics of national color were not come from difference of dye and dyeing method, could know that come from difference of society and cultural environment.

• Journal of the Korean Wood Science and Technology
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• 제50권1호
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• pp.31-45
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• 2022

After manufacturing the natural dyed actual size Hanji using 11 kinds of plant natural dyeing materials and 2 kinds of animal natural dyeing materials, the color characteristics and color change and color fastness after post-mordanting were compared and discussed. The hues of 13 types of natural dyed Hanji were black, PB, and RP, each with 1 type, YP with 3 types, and Y with 7 types. Among the natural dyeing materials, Chinese ink, indigo and Lac showed high color yield and color difference, and violet-root cromwell and gardenia seeds showed low color yield. The color fastness of Hanji dyed with turpentine diluted Ottchil, Pagoda tree seeds, Chinese ink and indigo was excellent, while that of gardenia seeds and violet-root cromwell were very poor. After post-mordanting of natural dyed Hanji with Al, Cu, and Fe mordants, the hue changes were show up the Alnus firma, clove, lac and cochineal. In addition, the color difference was very diverse and was overall the most biggest due to Fe mordant. After 72 hr. of UV irradiation on post-mordanting natural dyed Hanji, hue change was observed in 3 types and color fastness was improved in 8 types by post-mordanting. The Hue and color fastness are significantly different depending on the type of natural dying materials and post-mordants. Therefore, when dyeing Hanji with natural dyes, it is necessary to dye with sufficient knowledges and informations about the desired color and fastness.

• 한국의류산업학회지
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• 제4권4호
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• pp.394-398
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• 2002

The purse of this study was to invesigate the dyeing fastness on extract of bufferbur leaf princeps. The experimental items were divided into the mordant treatment, component of fabric and kind of mordants. The experimental study was done by laundering, abrasion (dry/wet), perspiration (acid/alkali), light, iron fastness test and color difference by C.C.M system. The summerized finding resulted from experiments and investigation are suggested as follows : In the C.C.M test on mordanting method and kind of fabric, color difference of silk was three times higher than cotton. The silk fabric was the highest in simultaneous mordant treatment but cotton fabric was the highest in none mordant. In color difference analysis on 6 mordants, that of silk and cotton was significantly improved when mordants was treatmented. Especially color difference of Fe and Cu mordanting treatment was higher than Cr, Sn, Al and none. In dyeing fastness on mordants laundering, perspiration, abrasion and iron fastness showed 4-5 grade but light-fastness showed 1-3 grade.

• 복식문화연구
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• 제19권3호
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• pp.650-660
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• 2011

Purpose of this study is to explore: 1) the difference in color sensibility evaluation, color attractiveness, and attitude toward the product, 2) the difference in the effect of color sensibility evaluation on color attractiveness, and 3) the difference in the effect of color sensibility evaluation on attitude toward the product between the identical clothing product presented in on-line and off-line settings. Experimental method was applied with 230 male and female university students using stimuli of an on-line site as well as an off-line window display presenting the same white t-shirts. Color sensibility factors of white t-shirt were hedonic, stimulating, active, and spatial senses. These color sensibility factors of the clothing product affected product color attractiveness as well as attitude toward the product. Although there were not differences in color sensibility evaluation, product attractiveness, and attitude toward the product between items presented in on-line and off-line settings, difference was found in the effect of color sensibility on the color attractiveness and attitude toward the product. The effect of color sensibility on color attractiveness and attitude toward the product was stronger in on-line than in off-line setting. Hedonic sense was the most important factor influencing attractiveness of product color and attitude toward the product. In addition, spatial sense affected attractiveness of product color in on-line setting; and stimulating sense impacted attitude toward the product in off-line setting. Based on the results implications were generated.

• 한국가구학회지
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• 제22권4호
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• pp.265-269
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• 2011

To make value-added products from small-diameter larch logs it is necessary to reduce the color variation between boards. The effect of heat treatment on the color variation was investigated. Four hundred air-dried larch squares were visually classified into six groups. The largest color difference index between them was 8.8. When they were kiln-dried lower than $120^{\circ}C$, their average color difference indexes decreased to less than 6.0 compared with the air-dried. However statistical analyses revealed that kiln-drying largely increased the variation of the indexes of the color elements. Heat-treatment above $150^{\circ}C$ increased the color difference indexes with the increase of temperature. The variation of color difference indexes within a group at $190^{\circ}C$ were less than the groups at $150^{\circ}C$ and $170^{\circ}C$. It implies that heat treatment at $190^{\circ}C$ could make the color of larch squares uniform.

• 한국염색가공학회지
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• 제17권2호
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• pp.19-25
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• 2005

A colour-difference formulae would be based on a colour appearance model, but, So far, most colour-difference formulae in common use are based on empirical fits to data. Therefore, of the many proposed, none are completely satisfactory but advances have been made in recent years. A new color-difference data set has been produced with the aims of making a comparison of the advanced CIE Lab formulae as well as confirming the effect of color-difference. 416 low lightness pairs that have only lightness-difference were produced for evaluation of CIE Lab-based formulae on lightness-difference from glossy polyester fabric. The standard color-difference pair was prepared and used. It was neutral grey sample pair that has only lightness difference. The standard pair was used to investigate lightness tolerances. And grey-scale method used to evaluate visual assessment. CIE Lab coordinates of the samples were measured using a X-Rite 8200 spectrophotometer. Visual assessments were carried out using Gretag Macbeth The Judge II Light Booth. A study of color tolerances at low lightness was carried out and get avaliable some results.