• Korean Journal of Optics and Photonics
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• v.23 no.4
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• pp.147-153
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• 2012

Multi-view 3D displays based on a limited number of pixels have the problem that the stereo-scopic image has a low resolution because of increasing view number. To solve the problem of low resolution, we propose an optical approaching method that focuses the width of a unit pixel by using a commercial spherical shape lenticular lens sheet and increases the effective resolution by increasing the number of sources of light in the multi-view 3D display system based on projection type. The method was performed in such an order that several main derivable parameters were defined, and, through the theoretical and experimental result, the value of the contractible unit pixel width and the scalable effective resolution was derived in a given system environment. As a result, for the case that the ray of light from the projector transmitted the 25 LPI lenticular lens sheet which has the pitch size 1.016 mm, the focused unit pixel width was 0.19 mm and the scalable effective resolution was, at most, 5 times wider than the original one. In addition, the range of depth of focus was 1.496 mm, which shows us the range of thickness tolerances of commercial spherical shape lenticular lens sheet and sufficient optical alignment tolerances.

• Journal of Broadcast Engineering
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• v.19 no.6
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• pp.896-906
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• 2014

In this paper, a real-time dual-mode temporal synchronization and compensation method based on a new reliability measure in stereoscopic video is proposed. The goal of temporal alignment is to detect the temporal asynchrony and recover synchronization of the two video streams. The accuracy of the temporal synchronization algorithm depends on the 3DTV contents. In order to compensate the temporal synchronization error, it is necessary to judge whether the result of the temporal synchronization is reliable or not. Based on our recently developed temporal synchronization method[1], we define a new reliability measure for the result of the temporal synchronization method. Furthermore, we developed a dual-mode temporal synchronization method, which uses a usual texture matching method and the temporal spatiogram method[1]. The new reliability measure is based on two distinctive features, a dynamic feature for scene change and a matching distinction feature. Various experimental results show the effectiveness of the proposed method. The proposed algorithms are evaluated and verified through an experimental system implemented for 3DTV.

• International Journal of Contents
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• v.14 no.3
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• pp.1-6
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• 2018

For 3D display applications, auto-stereoscopic display methods that can provide 3D images without glasses have been actively developed. This paper is concerned with developing a display system for elemental images of real space using integral imaging. Unlike the conventional method, which reduces a color image to the level as much as a generated depth image does, we have minimized original color image data loss by generating an enlarged depth image with interpolation methods. Our method was efficiently implemented by applying a GPU parallel processing technique with OpenCL to rapidly generate a large amount of elemental image data. We also obtained experimental results for displaying higher quality integral imaging rather than one generated by previous methods.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.615-617
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• 2012

최근 이동통신 인프라 기술은 고용량 전송이 가능한 LTE 이동 통신 시스템이 구축되었다. 따라서 3G 이동통신 시스템에 비해 서비스 용량에 비해 입체영상을 이동통신 시스템에서 실시간으로 전송할 수 있는 고용량의 무선 링크를 확보하였다. 하지만 LTE 이동 통신 시스템도 입체영상을 그대로 전송하기에는 문제점을 가지고 있다. 따라서 본 논문에서는 차세대 이동통신 시스템인 LTE 시스템과 WiFi 네트워크 기반의 고품질의 입체영상을 전송하기 위한 전송 서비스 네트워크 모델을 고찰한다.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.47 no.4
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• pp.15-20
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• 2010

The three dimensional information is extracted and visualized using by stereo images of the object and the method for a 3D stereoscopic image is presented by the vergence control algorithm. The matching, which is applied a undistortion of lens and the energy function, is executed for the efficient extraction three dimensional information. Especially, applying the optimized method of matched line to the multi direction of the disparity imges. The disadvantages of multi directional method and reliability expansion method is collected. The matched interesting range of the three dimensional information is visualized using by VRML and more 3D stereoscopic image is visualized through the vergence control according to distance of the object. more improved three dimensional information is provided to observer by visualizing both of them at the same time.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2012.11a
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• pp.199-202
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• 2012

인터넷 네트워크의 발달로 3D 콘텐츠와 같은 대용량의 미디어 파일을 인터넷 프로토콜을 이용하여 전송 가능해 졌다. 또한 사용자는 스마트 폰, 스마트 TV, tablet-PC 등과 같은 다양한 디바이스를 통해 인터넷 접근이 가능한 여러 장소에서 원하는 콘텐츠를 전달받아 소비하는 형태가 널리 퍼지고 있다. 이에 따라 안정적인 인터넷 네트워크 환경의 필요성과 IP기반 스트리밍 서비스와 같은 기술의 중요성이 부각되고 있는 실정이다. 하지만 유동적인 인터넷 환경에서는 스트리밍 서비스의 QoS(Quality of Service)를 보장하기 힘들고, 3D 입체영상과 같은 고화질, 고용량의 미디어 파일을 대상으로 할 경우 사용자에게 끊김없는 스트리밍 서비스를 제공하기 어렵다. 이러한 문제를 해결하기 위해서, 인터넷 네트워크 환경을 고려하여 사용자들이 원하는 콘텐츠를 고품질 혹은 저 품질로 제공 할 수 있는 적응적 스트리밍 서비스에 관한 기술 개발이 등장하게 되었고, 현재 국제 표준화 기구인 MPEG(Moving Picture experts Group)에서 DASH(Dynamic Adaptive Streaming over HTTP)라는 이름으로 표준화가 진행 중에 있다. 이에 본 논문에서는 DASH를 이용한 3D 콘텐츠의 적응적 스트리밍 서비스를 위하여 스테레오스코픽 영상의 세그먼트 파일규격 구성방안에 대해서 제안한다. DASH를 이용한 3D 스트리밍 서비스는 사용자들에게 IP 망을 통해 다양한 품질의 3D 콘텐츠를 제공할 수 있으며, 또한 하나의 3D 콘텐츠로 다양한 디바이스에 적용 가능하다는 이점이 있다.

• Smart Media Journal
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• v.2 no.4
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• pp.27-33
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• 2013

Multi-view video system provides both realistic 3D feelings and free-view navigation. But it is hard to transmit too huge data, so we send only two or three view images and generate intermediate view image using depth information. In this paper, we propose high quality multi-view image generation method from stereoscopic images. Since the stereo matching method does not provide accurate disparity values for all the pixels, especially at the occlusion area, we propose an occlusion handling method using the background pixels at first. We also apply a joint bilateral filtering to enhance the disparity map at the object boundary since it can affect the quality of synthesized images significantly. Finally, we can generate virtual view images at intermediate view positions using confidence map to reduce bad pixel and hole's error. Experimental results show the proposed method performs better than the conventional method.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.5
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• pp.175-182
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• 2013

This paper proposes a readability enhancement filter for Patterned Retarder (PR) display. In general, when some texts in stereoscopic images are shown on PR display, their readability tends to be lowered. In order to overcome this problem, we present a readability enhancement algorithm which consists of readability filtering stage and post-processing stage for specific characters. First, each input stereo image is divided into an odd line image and an even line image. Then, they are independently up-scaled vertically by using Lanczos filter. Next, two up-scaled line images are averaged considering vertical phase difference. In post-processing stage, two specific characters which are normally difficult to read on PR display are detected, and they are filtered for additional readability enhancement. Here, this additional filtering is based on a specific brightness adjustment, and is applied only for two characters. The experiment results show that the proposed method achieves significant improvement in terms of readability in comparison with the previous scheme.

• Journal of Broadcast Engineering
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• v.9 no.3
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• pp.257-273
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• 2004

In stereoscopic or multi-view three dimensional display systems, the synthesis of intermediate sequences is inevitably needed to assure look-around capability and continuous motion parallax so that it could enhance comfortable 3D perception. The quadtree-based disparity estimation is one of the most remarkable methods for synthesis of Intermediate sequences due to the simplicity of its algorithm and hardware implementation. In this paper, we propose two ideas in order to reduce the annoying flicker at the object boundaries of synthesized intermediate sequences by quadtree-based disparity estimation. First, new split-scheme provides more consistent auadtree-splitting during the disparity estimation. Secondly, adaptive temporal smoothing using correlation between present frame and previous one relieves error of disparity estimation. Two proposed Ideas are tested by using several stereoscopic sequences, and the annoying flickering is remarkably reduced by them.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.452-455
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• 2000

본 논문에서는 현재 수행중인 가상현실 기술을 이용한 컴퓨터 지원 교육훈력 시스템(CATS : Computer Assister Training System) 개념 설계를 바탕으로 발전소 3D 그래픽 모델을 작성하고 가상현실도구를 사용하여 정보의 변경 및 가공처리로 가상발전소(Virtual Plant) 및 가상판넬(Virtual Panel)상세설계 및 구현결과에 대해 서술한다. 이를 통해 발전소 주요계통 설비 및 발전소 본관 내부의 주요기기 등을 Navigation 할수 있고 이에 대한 엔지니어링 데이터베이스 환경을 작성하여 추후 정확하고 신속한 계통 설비 및 주요기기 정보를 얻을수 있도록 하였으며 가상판넬(Virtual Pannel)을 만들어 학생들이 시뮬레이터실로 가지 않고 MCR(Main Control Room)에서 발전소를 운전하는 것과 같은 효과를 강의실에서 얻을 수 있다.