• IEIE Transactions on Smart Processing and Computing
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• 제4권4호
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• pp.272-280
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• 2015

This paper proposes color databases that can be used for various purposes for people with a color vision deficiency (CVD). The purpose of this paper is to group colors within the sRGB gamut into the CIE $L^*a^*b^*$ color space using the Brettel algorithm to simulate the representative colors of each group into colors visible to people with a CVD, and to establish a confusion line database by comparing colors that might cause confusion for people with different types of color vision deficiency. The validity of the established confusion lines were verified by using an Ishihara chart. The different colors that confuse those with a CVD in an Ishihara chart are located in the same confusion line database for both protanopia and deutanopia. Instead of the 3D RGB color space, we have grouped confusion colors to the CIE $L^*a^*b^*$ space coordinates in a more distinctive and intuitive manner, and can establish a database of colors that can be perceived by people with a CVD more accurately. Editor - Highlight - Do these changes reflect the intended meaning? If not, please rephrase as intended.

• 전자공학회논문지
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• 제51권9호
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• pp.129-138
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• 2014

현재까지 단일 영상센서를 사용하는 디지털 이미징 장치들을 위해 다양한 보간 기법들이 제안되어 왔다. 그러나 기존 보간 기법들은 주기적 샘플링을 사용하는 영상센서의 출력 해상도 모드를 고려하지 않았다. 따라서 출력 영상에서 해상도 화질 열화 및 color artifacts(color moire, zipper)현상들이 문제점으로 나타난다. 본 논문은 영상센서의 출력 해상도 모드를 고려한 색상 보간 알고리즘을 제안한다. 제안하는 보간 알고리즘은 효과적으로 에지 예측을 보상하는 초기단계와 해상도 모드를 고려하여 최소한의 방향성을 이용한 화질 개선단계로 구성되었다. 기존 기법들과 제안하는 알고리즘 결과를 분석 하기위해 주관적 화질비교와 PSNR(Peak Signal to Noise Ratio)을 통한 객관적 화질평가를 비교하였다. 객관적인 수치와 시각적인 부분에서 기존 기법 대비 color artifacts를 효과적으로 개선하였다.

• Journal of Information Processing Systems
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• 제13권3호
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• pp.448-463
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• 2017

Multimedia is a ubiquitous and indispensable part of our daily life and learning such as audio, image, and video. Objective and subjective quality evaluations play an important role in various multimedia applications. Blind image quality assessment (BIQA) is used to indicate the perceptual quality of a distorted image, while its reference image is not considered and used. Blur is one of the common image distortions. In this paper, we propose a novel BIQA index for Gaussian blur distortion based on the fact that images with different blur degree will have different changes through the same blur. We describe this discrimination from three aspects: color, edge, and structure. For color, we adopt color histogram; for edge, we use edge intensity map, and saliency map is used as the weighting function to be consistent with human visual system (HVS); for structure, we use structure tensor and structural similarity (SSIM) index. Numerous experiments based on four benchmark databases show that our proposed index is highly consistent with the subjective quality assessment.

• 전자공학회논문지CI
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• 제39권1호
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• pp.67-74
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• 2002

멀티미디어 기기의 발전과 더불어 다양한 매체로부터 다양한 종류의 영상, 오디오, 텍스트 등의 정보가 난무하고, 이들 정보를 사용자의 요구에 따라 효과적으로 검색·관리를 위한 연구가 활발히 진행되어지고 있다. 실시간 연속 영상에서 내용이 연결되는 부분과 장면전환 등에 의해 내용이 바뀌는 부분을 자동 검출 가능하다면 적은 량의 데이터 내용 표현으로 영상 검색의 효율성을 증대시키는 효과를 가져 올 수 있을 것이다. 본 논문에서는 영상의 특성에 따른 실시간 Cut detection 기술을 제안하고 이 방법의 성능을 다양한 영상 데이터를 바탕으로 정확성 평가를 하였다. 그 결과 영상데이터의 컬러 특성에 관한 통계적인 특성 정보를 필요로 하는 기존의 컬러 히스토그램 방식과는 달리 본 방식은 각 프레임 영상의 색상 분포의 변화분에 의존하므로 어떤 종류의 영상 패턴에도 적용 가능한 robust한 방식이며, 실시간 입력영상의 cut detection 이 가능한 이점이 있음을 확인할 수 있었다.

• 전자공학회논문지 IE
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• 제43권1호
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• pp.25-31
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• 2006

본 연구에서 기존 얼굴추출과 인식의 단점을 색상정보와 KLT를 이용하여 극복하고 얼굴 전체를 특징으로 하는 방법을 제안하였다. 얼굴의 특징은 KLT를 이용하는 PCA(Principal Component Analysis) 주성분 분석방법을 통해 중요한 정보만 추출하였다. 색상정보와 KLT를 이용한 얼굴인식의 방법을 제안함으로써 색상정보를 가진 다양한 크기와 각도의 얼굴에 대하여 90%이상의 인식 효율을 얻을 수 있었다.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2019년도 제60차 하계학술대회논문집 27권2호
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• pp.381-382
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• 2019

Recently, various search techniques using artificial intelligence techniques have been introduced. It is also possible to use the artificial intelligence to grasp customer propensity. Analyzing the clothes that customers usually wear, it is possible to analyze various colors such as favorite colors, patterns, and fashion styles. In this study, we use artificial intelligence technology to create an application that distinguish between adults and children by combining various factors such as shape, type, color and size of human clothes. Through this, it will be possible to utilize it in a living area where children can be protected in advance by grasping the intrusion of unauthorized adults in the living area where children live mainly. In addition, in the future, we can obtain good results to detect stranger adult person if we apply this experimental result to the detection system using clothing information.

• Journal of Information Display
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• 제6권1호
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• pp.33-36
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• 2005

To obtain various colors from the blue emitting poly(fluorene)s, two different approaches are introduced. One is copolymerization with low band gap comonomers and the other is molecular doping with various dyes. As fast and efficient exciton migration and trapping and/or energy transfer between the chromorphoric segments or doped dyes in conjugated polymers can shift the emission to longer wavelengths, these phenomena can be utilized to obtain various colors from the intrinsically blue light emitting poly(fluorene)s.

• IEIE Transactions on Smart Processing and Computing
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• 제4권4호
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• pp.237-250
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• 2015

This paper describes a hardware-oriented algorithm and its conceptual implementation in a real-time speed limit traffic sign detection system on an automotive-oriented field-programmable gate array (FPGA). It solves the training and color dependence problems found in other research, which saw reduced recognition accuracy under unlearned conditions when color has changed. The algorithm is applicable to various platforms, such as color or grayscale cameras, high-resolution (4K) or low-resolution (VGA) cameras, and high-end or low-end FPGAs. It is also robust under various conditions, such as daytime, night time, and on rainy nights, and is adaptable to various countries' speed limit traffic sign systems. The speed limit traffic sign candidates on each grayscale video frame are detected through two simple computational stages using global luminosity and local pixel direction. Pipeline implementation using results-sharing on overlap, application of a RAM-based shift register, and optimization of scan window sizes results in a small but high-performance implementation. The proposed system matches the processing speed requirement for a 60 fps system. The speed limit traffic sign recognition system achieves better than 98% accuracy in detection and recognition, even under difficult conditions such as rainy nights, and is implementable on the low-end, low-cost Xilinx Zynq automotive Z7020 FPGA.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 신호처리소사이어티 추계학술대회 논문집
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• pp.553-556
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• 2003

In the field of content-based image retrieval, various mathematical low-level features have been proposed to describe the perceptual content of images. Since most of the features are assumed to be independent of each other, one feature is extracted from images without any consideration of the other features. Recently proposed CCE and SCFT taking advantage of the correlation between color and texture have shown relatively good performance. In this paper, the performance of CCE, SCFT, and the traditional regular weighted comparison method are evaluated. Simulation results with natural images have shown that CCE outperforms the other methods.

• Journal of Information Display
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• 제4권2호
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• pp.7-12
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• 2003

We discuss main techniques to improve legibility of electroluminescent displays. Emphasis is placed on use of destructive optical interference to cancel ambient light reflected from the back electrode of the device. Basic optical principles and material composition of the optical interference contrast-enhancing stack (CES) are presented. We also describe the improved human factors of electroluminescent devices assisted with a CES. Achromatic contrast is the most important contributor to display's legibility. In some conditions color contrast may also be important. Contributing to both luminance and color contrast enhancement, the contrast-enhancing stack may play an important role in various display applications.