• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.517-520
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• 2005

In this paper, we propose a motion picture processor for CSTN-LCD without gamut problem. The proposed method employed CDF(Cumulative Density Function) in order to perform a mutual independent in image gradation and color balance. In addition, the proposed method has solved a gamut problem used by conversion of RGB system and CMY system. Also, we apply the BFI (Black Field Insertion) to the design to compensate for response time of a LC (Liquid Crystal). The proposed hardware architecture has been implemented and verified using a FPGA on prototype board. Visual test and standard deviation of histogram were introduced to evaluate the result of the proposed method and the original ones.

• Proceedings of the IEEK Conference
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• 2000.09a
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• pp.693-696
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• 2000

RGB 컬러 좌표계상에서는 각 컬러 성분간의 상관도가 매우 높고, 색을 표현할 때 R, G, B 각 성분에 똑같은 대역폭을 주기 때문에 영상의 압축 관점에서 효율적이지 못하다. 대표적인 영상압축 알고리즘인 MPEG-1,MPEG-2, MPEG-4, H.263, JPEG, JPEG-2000등에서는 압축 효율을 높이기 위해서 YCbCr 컬러 좌표계를 사용하고 있다. 본 논문에서는 좀 더 효율적인 영상 압축을 위해서 새로운 컬러 좌표계를 제안하고자 한다. 제안하는 컬러 좌표계는 DCT 커널에 기반을 두고 있다. DCT 컬러 좌표계는 각각의 커널끼리 직교하며, 빠른 연산이 가능하고, 구조가 간단하다. 실험결과, DCT 컬러 좌표계의 신호들의 분산이 YCbCr 컬러 좌표계의 신호들의 분산보다 작은 경향을 보이며, 동일한 비트율에서 작은 MSE (Mean Square Error)를 가지는 것을 실험적으로 알 수 있다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2009.01a
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• pp.241-244
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• 2009

최근 모바일폰에 500만 화소 이상의 카메라 모듈이 장착되는 등 모바일 장치에서 고해상도 영상의 인코딩 및 디코딩에 대한 요구가 크게 늘어남에 따라 저성능 시스템에서 실시간으로 동작하는 영상 코덱 구현에 대한 필요성이 증대되고 있다. 본 논문은 JPEG 디코딩의 마지막 단계인 컬러변환 과정에 대해 계산 복잡도를 최적화하는 기법을 제안하고 성능을 평가하였다. 제안된 기법은 JPEG 디코딩 과정에서 IDCT(Inverse Discrete Cosine Transform) 변환과 컬러변환 간의 선형성을 바탕으로 이들 연산 순서를 재배열함으로써 컬러변환 과정에서 요구되는 계산 횟수를 줄이고, 재배열된 부동소수점 연산에 대해 정수 맵핑을 적용하여 계산 복잡도를 줄임으로써 실행시간을 최적화하였다. 임베디드 시스템 개발 플랫폼에서의 성능 평가를 통해 제안된 기법이 기존의 컬러변환 기법들과 비교하여 실행시간을 크게 단축함을 얄 수 있었으나 복원 영상의 화질이 상대적으로 저하됨을 확인하였다.

• Proceedings of the KOSOMBE Conference
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• v.1994 no.05
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• pp.88-91
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• 1994

We develope a assistant system of foot pressure distribution for improvement gait Pattern, adapted working speed, and minimitation of muscle fatigue of the sensory feedback type FES system(SEFES). This measurement system consist of mat type pressure sensor with piezo electric films. The pressure data signal multiflexed input scanning method processed A/D conversion after two step amplify and integrate. Matrix sensor interface to PC for pseudo color display by level of Pressure distribution data. This measurement system clinically evaluated in hemiplegic patients. It has produced acceptable results with optimal location of the food sensor's pressure point and avoid the muscle fatigue.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.345-347
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• 2011

최근 3D 콘텐츠의 관심 증가는 Display 장치, 모바일 기기 등의 하드웨어적인 발전을 가져왔고, 이에 따른 입체 콘텐츠의 필요성이 대두되고 있다. 본 논문에서는 자동으로 2D영상을 3D입체영상으로 변환하는 기법을 제안한다. 영상에서 에지맵과 채도 영상을 추출하고 합성하여 깊이맵을 생성하고 필터를 통해 노이즈 제거 등 보정 작업하여 최종 깊이맵을 생성한다. 이 깊이맵을 이용해 2D영상의 시프트된 영상을 만들어 입체영상을 생성한다.

• Journal of the Korean Graphic Arts Communication Society
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• v.16 no.1
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• pp.81-93
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• 1998

For the purpose of preparation of monodispersed spherical zinc oxide fine particles, and experimental research on the preparation of zinc oxide particles from zinc salts solutions by high temperature precipitation reaction was performed. Zinc oxide particles were precipitated from all the precipitation solutions tested if the precipitation temperature was higher than 60$^{\circ}$C. As the precipitation temperature increased until 80$^{\circ}$C, the average particle diameter of zinc oxide particles decreased and the narrower particle size distribution were obtained. Spherical zinc oxide fine particles with relativeyl narrow particle size distribution were precipitated from the ZnSo4 solutions with NaOH as precipitant. Final pH of precipitation solution had an effect on the amount of zinc oxide precipitated, but had no effect on the their particle size or size distribution.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.1393-1396
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• 2008

Image quality is one of the most important factors affecting the performance of digital displays. This paper introduces various digital image processing techniques commonly applied to digital displays. They include preferred color correction, tone reproduction, and frame rate conversion. Also, issues related to image quality evaluation are addressed.

• KIEAE Journal
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• v.2 no.2
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• pp.33-38
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• 2002

There are a number of practical uses for devices which are capable of piping large amounts of light: illumination of areas where there would be maintenance, safety, or security problems with electronic light sources; piping sunlight into indoor areas for illumination; and the conversion of high luminous efficacy, good color quality, high intensity discharge lamps into more acceptable linear of area sources of light. Prism light guides are hollow structures which pipe light by means of total internal reflectin(TIR). These devices are unique in their ability to combine the efficiency of TIR with the relatively low cost of hollow structure. An important application stems from their ability to transform a point source of light such as an incandescent or discharge lamp into a linear or area source of light or illumination. We report the development of an economical, flexible prismatic film for fabricating the light guide wall. This guide geometries and films are currently under development.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• v.4B no.1
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• pp.24-28
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• 2004

Metal halide lamps have been made suitable for use in outdoor illumination systems over many years. They are also widely used in application and commercial lighting due to their attracting properties such as good quality color, rendering and high efficiency. Over the past few years, a considerable number of studies have been conducted on the electronic ballast with hot restarting and resonance phenomenon. However, very few attempts have been made at the adaptive ignition method according to lamp state. This paper proposes an electronic ballast for metal halide lamps with an igniter for adaptive ignition. The proposed electronic ballast can generate different ignition voltages according to the arc tube state. The experimental results showed that the proposed ballast circuit using adaptive igniter is suitable for 70W HQI lamps.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.855-856
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• 2008

In this paper, we studied the performance evaluation of a vehicular rear-view camera through quantifying the image quality based on several objective criteria from the ISO (International Organization for Standardization). In addition, various experimental environments are defined considering the conditions under which a rear-view camera may need to operate. The process for evaluating the performance of a rear-view camera is composed of five objective criteria: noise test, resolution test, OECF (opto-electronic conversion function) test, color characterization test, and pincushion and barrel distortion tests. The proposed image quality quantification method then expresses the results of each test as a single value, allowing easy evaluation.