• 한국인쇄학회지
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• 제15권2호
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• pp.25-40
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• 1997

This research was carried out to investigated the effect of base paper and latex binder on printability and obtical properties of coated paper. Especially, it examined the effect of th pH of vase paper surface and functional groups of latices on the interactions between coating color components and on the structure of coated layer. It was found that the behavior of coating color containing amphoeric latex depends on the pH in the boundary region between coating color and base paper. Thus, the coating color formulated with amphoteric latex formed bulky coating layer by inducing stronger interaction between paper surface and coating components than the coating color with anionic latex. The coated paper with amphoteric latex showed better optical properties (i.e.gloss and optical) and printability (i.e. ink receptivity, wet ink receptivity, and ink set off) than the conventional anionic latex in the acidic and alkaline paper. However, dry pick strength of the coated paper was less decreased. This result indicated that amphoteric latex could also be applied practically to the alkaline paper.

• Journal of Multimedia Information System
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• 제6권4호
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• pp.185-190
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• 2019

For future autonomous cars, it is necessary to recognize various surrounding environments such as lanes, traffic lights, and vehicles. This paper presents a method of speed sign recognition from a single image in automatic driving assistance systems. The detection step with the proposed method emphasizes the color attributes in modified YUV color space because speed sign area is affected by color. The proposed method is further improved by extracting the digits from the highlighted circle region. A sequential cascade AdaBoost classifier is then used in the recognition step for real-time processing. Experimental results show the performance of the proposed algorithm is superior to that of conventional algorithms for various speed signs and real-world conditions.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.9-11
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• 2005

We propose a new content-based image retrieval using a block color co-occurrence matrix (BCCM) and pattern correlogram. In the proposed method, the color feature vectors are extracted by using BCCM that represents the probability of the co-occurrence of two mean colors within blocks. Also the pattern feature vectors are extracted by using pattern correlogram which is combined with spatial correlation of pattern. In the proposed pattern correlogram method. after block-divided image is classified into 48 patterns with respect to the change of the RGB color of the image, joint probability between the same pattern from the surrounding blocks existing at the fixed distance and the center pattern is calculated. Experimental results show that the proposed method can outperform the conventional methods as regards the precision and the size of the feature vector dimension.

• 한국재난정보학회 논문집
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• 제3권1호
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• pp.21-35
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• 2007

The principal objective of this research is to evaluate the laboratory mechanical characteristics of color asphalt binders and mixtures. The dynamic shear rheometer (DSR) tests were performed to analyze the viscous and elastic behavior of asphalt binders. Various tests were also conducted to investigate the laboratory performance characteristics of color asphalt mixtures. The test results revealed that the values of $G^*$ and ${\delta}$ of modified color binders were higher than those of the conventional binders at low temperatures. These results are expected to increase the thermal cracking resistance of asphalt mixtures at low temperatures. It should be noted that the color asphalt mixtures with modified asphalt binder can be widely used as a common pavement material with a proper mix design.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅳ
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• pp.1767-1770
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• 2003

This paper proposes an algorithm that can reduce the estimation error of surface spectral-reflectance(SR) when using a conventional 3-band RGB camera. In the proposed method, the estimation error is reduced by using adaptive principle components (PCs) for each color region. To build an adaptive set of PCs, n SR populations are organized for n PC sets using the Lloyd quantizer design algorithm. The Macbeth Color Checker is utilized for the initial representative SR values for 1485 Munsell color chips as the total color population, then the Munsell chips arc divided into subsets with a set of corresponding adaptive PCs organized for each subset.

• Journal of the Optical Society of Korea
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• 제11권2호
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• pp.67-70
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• 2007

A Wide Color Gamut Backlight system was studied using a three-band white Light-Emitting Diode. A three-band white light-emitting diode (LED) was fabricated using an InGaN-based blue LED chip that emits 445-nm blue peak, and a green phosphor and red phosphor that emit 535-nm green and 621-nm red peak emissions, respectively, when excited by 450-nm blue light. Using for this three-band white LED, wide color gamut backlight unit (BLU) was attained. The luminance of BLU and CIE 1931 chromaticity coordinates was $1,700Cd/m^2$ and (0.337, 0.346). Color filter matching simulations for this configuration show that the three-band white LED backlight can be enhanced by up to 16% over conventional white LED backlight color gamut.

• Journal of Digestive Cancer Reports
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• 제7권2호
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• pp.31-39
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• 2019

The early detection of early gastric cancer (EGC) is important. However, the sensitivity of conventional white light imaging (WLI) in detecting EGC had been reported to range only from 77% to 84%. Although the resolution of endoscopes has been remarkably developed, precancerous lesions such as adenomas and microscopic early cancers are difficult to diagnose with general endoscopy. Linked Color Imaging (LCI) magnifies the differences in color for easy detection. Therefore, it produces a bright image from a distance and is performed for screening endoscopy. The 410 nm wavelength of BLI (Blue Light Imaging) helps to detect cancer by showing microstructure and microvessels in the mucosal superficial layer. This review will focus on the utility of Image enhanced endoscopy (IEE) techniques in diagnosis of gastrointestinal cancer.

• 한국멀티미디어학회논문지
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• 제7권10호
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• pp.1370-1377
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• 2004

동일한 장면을 다양한 조건에서 촬영한 영상이나 비디오는 서로 다른 색감을 가지며 촬영 조건에서 중요한 역할을 하는 것은 현장의 조명이다. 조명의 색온도에 따라 전체적인 색감이 결정되므로 조명색의 변환방법이 필요하다. 본 논문에서는 임의로 지정된 색온도로의 조명색 변환 방법을 제안한다. 기존의 조명색 변환 방법은 미리 정해진 일정한 개수의 대표성이 있는 색온도에 대한 변환 관계를 미리 계산하여 두었다가 활용하는 정도이다. 제안한 방법은 임의로 지정한 기준과 목표로 하는 색온도에 대한 변환 관계를 직접적으로 구하여 적용할 수 있는 장점이 있다.

• 융합신호처리학회논문지
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• 제2권4호
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• pp.1-8
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• 2001

본 논문에서는 감소된 하드웨어 구조를 가지는 고성능 색조 변환 시스템을 제안한다. 입력 영상의 색조를 변환하기 위해서는 입력 영상의 색 온도를 구하는 것이 필요로 한다[1]. 색 온도를 구하기 위해서는 2-D 조명 색조 좌표에 의한 색 온도 계산 알고리즘을 필요로 한다. 그러나 20D 조명 색도 좌표 계산에 의해 색 온도 알고리즘을 채택하면 하드웨어 부담이 매우 큰 문제점이 있다. 그러므로 본 논문에서는 2-D 색 온도 알고리즘의 성능을 유지하면서, 하드웨어 복잡도를 감소시킬 수 있는 1-D 조명 색도 좌표에 의해 색 온도 계산 방법을 제안한다. 본 논문에서는 제안한 방법은 Xilinx Virtex FPGA XCV 2000E-6BG560을 이용하여 65MHz의 고속 동작과 1344*806의 고해상도를 가지는 fLCD-TV 시스템에서 검증하였다.

• 대한전자공학회논문지SP
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• 제37권5호
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• pp.64-75
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• 2000

본 논문에서는 출력 장치의 색역에 대하여 균일한 분포를 갖는 색표본(color sample) 생성 방법을 제안하고, 이를 이용한 색재현 방법을 소개한다. 즉 기존의 방법인 RGB(red, green, and blue) 혹은 CMY(cyan, magenta, yellow) 등 장치 의존형 색공간에서 균일한 색표본을 선택하는 것이 아니라 장치 독립형 균등 색공간인 CIELAB공간에서 균등 색표본을 선택하는 방법을 제안한다 또한 제안된 색표본의 성능을 평가하기 위하여 회귀 모델과 신경망을 이용한 색공간 변환을 수행하였다 동일한 크기의 색표본의 경우, 제안된 색표본을 이용한 색공간 변환 방법이 신경망, 회귀 모델 모두에서 색차를 줄일 수 있었다.