• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2018.06a
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• pp.294-296
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• 2018

최근 디지털 홀로그래피는 3차원 영상을 획득, 처리 및 재생을 하지만, 디스플레이 전자 소자 특성에 의한 시야각이 작아서 사용자의 관찰 가능한 시역이 제한적인 단점이 있으며, 따라서 복원된 입체 영상과 사용자 사이에 상호작용 서비스 제공이 용이하지 않는 한계를 지니고 있다. 본 논문에서 우리는 $360^{\circ}$ 전방향 (1,024 시점)의 홀로그래픽 3D 콘텐츠를 FFT 알고리즘을 이용하여 생성하고, 이 콘텐츠를 디스플레이할 수 있으면서 동시에 이 콘텐츠와 사용자 간 상호작용이 가능한, 광시야각 (${\pm}60^{\circ}$) 홀로그래픽 디스플레이 시스템의 설계 및 제작한 결과를 실증한다.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.43 no.10 s.352
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• pp.22-27
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• 2006

In this paper, we propose a method that can generate a computer-generated hologram (CGH) from the depth stream and color image outputs provided by an active sensor add-on camera. Distinguished from an existing holographic display system that uses a computer graphic model to generate CGH, this method utilizes a real camera image including a depth information for each object captured by the camera, as well as color information. This procedure consists of two steps that the acquirement of a depth-annotated image of real object, and generation of CGH according to the 3D information that is extracted from the depth cue. In addition, we display the generated CGH via a holographic display system. In experimental system we reconstruct an image made from CGH with a reflective LCD panel that had a pixel-pitch of 10.4um and resolution of 1408X1050.

• Journal of the Korea Computer Industry Society
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• v.2 no.12
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• pp.1609-1616
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• 2001

We present an autostereoscopic 3D display system using volume hologram. In this proposed system, the interference pattern of angular multiplexed plane reference and object beams are recorded into a volume hologram, which plays a role of guiding object beams of multi-view images into the desired perspective directions. For reconstruction, object beams containing the desired multi-view image information, which satisfy Bragg matching condition, are illuminated in the time-division multiplexed manner onto the crystal. Then multiple stereoscopic images are projected to the display plane for autostereoscopic 3D viewing. It is possible to make a high resolution multiview 3D display system independent upon the viewpoint.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.1216-1219
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• 2004

LC and polymer miscibility in HPDLC has been studied in terms of solubility parameter. It was found that better grating formation and diffraction efficiency were obtained when the difference in solubility parameters between polymer and LC is greater.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.1212-1215
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• 2004

Diffraction modes of holographic grating were fabricated with polyurethane acrylates(PUA). Two types of silica (AEROSIL 200 and AEROSIL R812) were added to reduce the shrinkage of polymer matrix. It was founded that shrinkage of PUA composite film was reduced with the addition of silica. HPDLC based PUA/silica composite also showed high diffraction efficiency. The morphology of the resultant gratings was analyzed by using scanning electron microscopy(SEM) and Tg of the polymer matrix by dynamic mechanical thermal analysis(DMTA).

• Proceedings of the IEEK Conference
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• 1999.11a
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• pp.921-924
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• 1999

By controlling the pixels of a liquid crystal display (LCD) electronically, we fabricated a real-time moving window on a LCD, through which light passes. Using the moving window and hi-focusing lens, we suggested a non-mechanical spatio-angular multiplexed holographic memory system and demonstrated its feasibility through optical experiments. The principle of the proposed method and optical experimental results are also presented.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.34D no.4
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• pp.54-61
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• 1997

In this paper, a new holographic display system that can in real-time reconstruct the complex hologram without the bias and the conjugate image, which is obtained form the modified triangular interferometer, is presented. The proposed system is made of adding liquid crystal displays(LCDs), a $\lambda$/2 wave plate, and a polarizing beam splitter to the conventional mach-zehnder interferontric configuration. We demonstrate through theoretical analysis and experiment that real-time image reconstruction from the complex hologram is possible using the proposed system.

• Electronics and Telecommunications Trends
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• v.30 no.3
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• pp.31-41
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• 2015

디지털 홀로그래피는 가간섭성 광원을 이용하여 광파의 진폭 정보뿐만 아니라 위상 정보를 기록 또는 재생하는 기술이다. 이러한 홀로그래피 방식의 광파 재생은 광파를 산란시키는 3차원 대상물을 정확하게 표현할 수 있어서 이상적인 디스플레이 방법으로 여겨진다. 본고에서는 디지털 홀로그래픽 디스플레이와 기존의 홀로그래픽 디스플레이가 갖고 있는 제한된 시야각을 확장하여 360도 방향에서 홀로그램 입체영상을 자유자재로 즐길 수 있는 테이블탑 형태의 홀로그래픽 디스플레이 기술을 소개한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1999.06a
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• pp.219-226
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• 1999

Recently a study of Virtual-Reality becomes active. Expectation to 3-D reproduction technology rises with it. Electro-holography using Spatial light modulator (SLM) attracts attention, because natural 3-D animated image is provided. In this paper recent development of 3D-TV by Electro-holography is reported. We consider the conditions to holographic TV such as input, transmission and display systems. Also we consider about fast hologram calculation because It is important to execute hologram calculation at high speed to realize the real time electro-holography. Then we consider the possibility of real time holography.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.1423-1426
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• 2008

This paper describes current work regarding two EC funded projects, MUTED and HELIUM3D whose objective is to produce an autostereoscopic display system which is well suited to domestic television applications. Both of these projects have common roots in a previous EC funded project (ATTEST) and both employ laser illumination and viewer head tracking.