• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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• pp.999-1004
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• 2002

This paper presents the color displays using more than three primary colors, for the reproduction of wider color gamut, and high-fidelity color reproduction. First, Natural Vision system, which is currently under development for the natural color reproduction in visual telecommunication applications, is introduced, The natural vision is based on spectrum instead of trichromatic color space, and enables high-fidelity color reproduction using multispectral and multiprimary technologies. Then, sixprimary color projection displays using LCD and DLP, and a four-primary color flat panel display are shown. It is experimentally demonstrated that the color gamut becomes much larger than conventional RGB-based display. In addition, it is proved that the spectral color reproduction using multiprimary display suppresses the influence of observer metamerism, and as a result, the color matching between the display and the real object is well improved.

• 비파괴검사학회지
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• 제5권1호
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• pp.3-8
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• 1985

A three dimensional vision is obtained by stereoscopic view using a modified commercial TV set and matching color filter glasses. Two video signals from two CCTV cameras are connected to the RGB (red, green, blue) inputs of picture tube selecting two different colors for two video signals. A synchronizing signal drives a CCTV camera and the color TV set. On the other hand, a delayed synchronizing signal drives the other CCTV camera shifting its image on display. This shift is used in correcting image distortion.

• 한국멀티미디어학회논문지
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• 제19권12호
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• pp.1936-1942
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• 2016

This paper presents a mobile color-compensating application using a RGB color compensation algorithm. The proposed application enables color vision deficiencies to differentiate images which cannot be distinguished by them. The suggested mobile application has two functions: converting images taken by camera and converting contents in the device screen. The proposed application is computationally inexpensive, since it does not require color space transformation. Simulation results show that the proposed application enables color vision deficiencies to receive information expressed by colors such as subway line maps.

• Journal of Preventive Medicine and Public Health
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• 제29권3호
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• pp.529-538
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• 1996

이 연구는 산업장에서 색각이상과 관련된 유기용제 폭로근로자들에서 후천성으로 발생할 수 있는 색각이상을 정성적이고 정량적으로 평가하고 색각이상에 영향을 미치는 요인을 조사하고자 저농도의 유기용제 폭로근로자 70명과 대조군 47명을 대상으로 실시하였다. 한식 이중 15색상 배열 검사기를 이용한 색각이상을 평가한 결과 색상배열의 착오 비율과 정량적으로 산출한 색 혼란지수는 유기용제 폭로군과 대조군간 차이가 없었다. 색 혼란지수와 연령과의 선형관계는 두 군 모두에서 연령이 증가할수록 색 혼란지수가 유의하게 증가하였으며(p<0.05), 각 연령군별로 층화한 색 혼란지수의 중앙값은 폭로군이 대조군보다 높게 나타났으나 29세이하 연령군에서만 통계학적으로 유의하였다. 15색상 배열검사의 배열형태에 따라 분류한 색각이상의 유병률은 두 군 모두에서 21%로 차이가 없었으며 색 혼란지수에 대해 연령, 흡연, 음주상태 및 유기용제 폭로유무를 독립변수로 하여 다중회귀분석을 실시한 결과 연령이 유의한 변수로 나타났다(p<0.05). 이상의 결과로는 유기용제 폭로와 색각이상 발생과의 관련성을 제시할 수 없으며, 추후 색각이상 평가를 위한 색상배열 검사의 표준환경 설정, 유기용제 폭로 근로자들의 개개인의 폭로정도 평가, 그리고 색각이상 검사결과를 정확하게 분류하는 기준 등에 대한 연구가 필요할 것이라고 생각되며, 또한 저농도의 유기용제에 폭로되는 근로자들의 색각이상의 평가는 정성적이고 정량적인 방법을 통한 평가가 바람직하며 일시적인 평가보다는 추적관찰을 통한 정량적인 지수의 변화를 관찰해야 할 것으로 생각된다.

• 센서학회지
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• 제20권3호
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• pp.178-186
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• 2011

Line tracking is a well defined method of mobile robot navigation. It is simple in concept, technically easy to implement, and already employed in many industrial sites. Among several different line tracking methods, magnetic sensing is widely used in practice. In comparison, vision-based tracking is less popular due mainly to its sensitivity to surrounding conditions such as brightness and floor characteristics although vision is the most powerful robotic sensing capability. In this paper, a vision-based robust path line detection technique is proposed for the navigation of a mobile robot assuming uncontrollable surrounding conditions. The technique proposed has four processing steps; color space transformation, pixel-level line sensing, block-level line sensing, and robot navigation control. This technique effectively uses hue and saturation color values in the line sensing so to be insensitive to the brightness variation. Line finding in block-level makes not only the technique immune from the error of line pixel detection but also the robot control easy. The proposed technique was tested with a real mobile robot and proved its effectiveness.

• Journal of Biosystems Engineering
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• 제19권4호
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• pp.380-396
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• 1994

A personal computer based color machine vision system with video camera and fluorescent lighting system was used to generate images of stationary tobacco leaves. Image processing algorithms were developed to extract both the geometric and the color features of tobacco leaves. Geometric features include area, perimeter, centroid, roundness and complex ratio. Color calibration scheme was developed to convert measured pixel values to the standard color unit using both statistics and artificial neural network algorithm. Improved back propagation algorithm showed less sum of square errors than multiple linear regression. Color features provide not only quality evaluation quantities but the accurate color measurement. Those quality features would be useful in grading tobacco automatically. This system would also be useful in measuring visual features of other agricultural products.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제22권1호
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• pp.7-15
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• 2016

Purpose: There are the number of color tactile walking surface indicators installed in Korea, because of indefinite regulation in blind and vision-impaired persons' tactile walking surface indicators. In case of yellow tactile walking surface indicators, it shows a deviation severe color. In this study, the researchers suggested color and brightness reference for helping blind and vision-impaired persons' walking through analyzing the color references of tactile walking surface indicators and the color luminance between tactile walking surface indicators and sidewalk currently used. Method: Reasonable luminance contrast criteria is suggested by examining ways of improving the recognition and recognition of objects according to color contrast visually impaired through literature review and analyzing standards of tactile walking surface indicators and the Europe, Japan and Australia of color and luminance contrast criteria. And by examining the color of the tactile walking surface indicators reported in Korea currently used to derive the problem presented by the luminance contrast in the reference and comparison. Finally, the visually impaired tactile walking surface indicators is set for color selection criteria for the recognition rate improves. Results: In order to improve the recognition rate to be tactile walking surface indicators of the contrast of the visually impaired and the environment than the color of the tactile walking surface indicators itself to secure always a certain level or more of brightness contrast values in the set of the color of the tactile walking surface indicators so important. Implication: In order to set the blind tactile walking surface indicators color recognition based on the verification of the real pedestrian based on the results presented in this paper it is required. It is to be understood as an element of the barrier free configuration for securing the walking pedestrian safety.

• Journal of Biosystems Engineering
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• 제32권2호
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• pp.130-135
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• 2007

An on-line real time grading and sorting system for dried oak mushrooms was developed for on-site application. Quality grades of the mushrooms were determined according to an industrial specification. Three dimensional visual quality features were used for the grading. A progressive color computer vision system with white LED illumination was implemented to develop an algorithm to extract external quality patterns of the dried oak mushrooms. Cap (top) and gil (stem) surface images were acquired sequentially and side image was obtained using mirror. Algorithms for extracting size, roundness, pattern and color of the cap, thickness, color of the gil and amount of rolled edge of the dried mushroom were developed. Utilizing those quality factors normal and abnormal ones were classified and normal mushrooms were further classified into 30 different grades. The sorting device was developed using microprocessor controlled electro-pneumatic system with stainless buckets. Grading accuracy was around 97% and processing time was 0.4 s in average.

• 한국안광학회지
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• 제5권2호
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• pp.5-9
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• 2000

시유발전위는 시피질 뇌파의 반응을 알 수 있는 전기 생리학적인 검사법이다. 이 검사는 눈의 기능을 타각적으로 검사하는 검사법이다. 본 연구는 색각에 대한 객관적인 검사를 위해 시유발전위를 사용하였다. 검사조건은 거리와 조명의 차이를 다르게 한 상태에서 실시하였다. 피검자는 한국인 성인으로 정상색각자를 대상으로 하였다. 수렴운동 상태에서 색각의 시표적에 따라서 시자극에 관계하는 시피질의 뇌파의 빈도는 델타파가 가장 많고, 다음으로 메타파, 세타파 그리고 알파파의 순으로 나타났다. 뇌파의 진폭에 대한 히스토그램은 거의 비정규분 포곡선을 가지며, 위상 분석에서는 대게 선형을 나타내었다. 시표의 종류에 따른 뇌파의 빈도는 비슷한 결과를 나타내었다.

• 한국염색가공학회지
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• 제3권3호
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• pp.57-68
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• 1991

Color vision 현상은 대상물질에 의해서 투과(transmission), 굴절(refraction), 반사(reflection)되어 나오는 광(light)이 망막(retina)에 비칠 때 시신경을 자극하여 뇌에 전달됨으로써 일어나는 하나의 감각현상(sensation)이다. 그러므로 그것은 인간의 감각상태, 광의 종류, 대상물질의 환경조건에 따라서, 즉 시각이 이루어진 그 순간에 인간의 눈이 어떻게 작용 하느냐에 달려있는 복잡한 현상 이다. 그래서 지금까지 발표된 20여개의 색채공간 중 그 어느 것도 인간의 감각량을 똑같이 표현할 수 없었던 것은 사실이다. 모든 자연현상이 그렇듯 인간도 개체마다 모두 다르고 대상물질 및 광에 관련된 너무 많은 요소(Factor)가 색지각 현상에 작용하기 때문에 이의 과학적 표현을 위해서는 단순화 및 normalization의 과정을 거치지 않으면 안되었던 것 같다. 지금까지 발표된 20여개의 color space중, perceptibility에 근거를 둔 유일한 color space인, Munsell color space의 해석에 Spline method 같은 수치 해석적 방법을 쓰지 않으면 안되는 그 이유를 제시하려 한다.