• IE interfaces
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• v.18 no.1
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• pp.82-87
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• 2005

Most of virtual reality systems ask users to control 3D objects or to navigate 3D world using 3D controllers. To maximize the human performance in the control, the design of virtual reality system and its input and output devices should be optimized. In this study, an experiment was designed to investigate the effects of three resolution factors of a virtual reality system on the human performance. Six subjects conducted the experiment for the factors; two frame rates, three spatial resolutions, and three pictorial contents. The result showed that the greater the spatial resolution was, the higher the human performance was. For the temporal resolution, fixed frame rate at 18 Hz was better than the varied maximized frame rate. For the pictorial contents, the virtual space with orientation cues marked the greatest performance than the other two conditions; the virtual space without any orientation cue and the virtual space like real world. These results could be applied for the design of virtual reality systems.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.339-340
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• 2011

현재의 IT 산업은 개인 컴퓨터에서 벗어나 이동이 가능한 mobile 분야에서 최근 mobile에 smart를 추가한 ubiquitous로 최근 변화하고 있다. 또한 스마트폰의 보급으로 3D 산업은 monitor display 에서부터 mobile display로 이동하고 있는 추세이다. 하지만 현재까지 3D산업의 mobile display는 device의 공급 부족과 콘텐츠 부족으로 인해 실생활에서 사용되고 있지 못하다. 따라서 안드로이드 폰을 기반으로 한 스마트폰을 이용하여 실시간 입체 영상을 구현하여 원활한 실시간 mobile 3D display 의 가능성과 향후 개선 방향을 제안하고자 한다. 본 논문은 Digital Image Stabilization을 사용하여 motion vector를 계산하여 실시간으로 입체 영상을 구현하는 방법을 제안한다.

• Journal of Information Display
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• v.13 no.1
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• pp.43-49
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• 2012

Depth sensitivity is considered one of the factors influencing 3D displays the most. In this paper, the perceptual 3D depth was quantitatively measured to compare the depth difference among the display devices. No difference was found in the typical display performance among the devices, but the subjective evaluation of the depth sensitivity where the disparity was varied showed that the organic light emitting diode (OLED) had the highest performance, mainly due to its almost 0% crosstalk, one of the features of OLED. Crosstalk is a form of image superposition that greatly affects the depth sensitivity. The experiment results showed that the quantitative depth sensitivity varies due to geometric factors such as disparity, viewing distance, and subjective sensitivity, depending on the display image characteristics, such as crosstalk and contrast.

• Proceedings of the Korea Contents Association Conference
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• 2010.05a
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• pp.511-513
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• 2010

최근 국내에서 디지털 영상 매체 연구개발 분야 중 관심을 끌고 있는 분야가 바로 3D 입체영상 구현에 관한 분야이다. 특히 모바일 3D 영상 구현에 대한 연구는 시스템이 점차 디지털로 전환되면서 빠른 속도로 진보하고 있다. 하지만 그 개발방향은 현재 구현되는 영상매체와 기술에 대한 하드웨어적인 접근에만 집중되어 있다. 즉, 수용자의 태도와 인식과 같은 기술 외적인 부분에 대한 연구는 상대적으로 활발하게 이루어지지 못하고 있다. 이에 본 연구는 사용자 중심의 모바일 입체영상콘텐츠 개발의 소프트웨어적 특성과 입체영상에 대한 수용자의 태도를 분석함으로써 앞으로 미래의 모바일영상콘텐츠 개발방안에 대한 로드맵을 그려보고자 할 것이다.

• Annual Conference of KIPS
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• 2010.11a
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• pp.664-667
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• 2010

3D 입체영상의 후반작업에서 색보정은 전체의 화질에 영향을 미치는 중요한 과정이다. 기존의 색보정 방법들은 좌, 우영상 중에서 히스토그램을 바탕으로하여 어느 한쪽을 기준으로 일치성을 강화하는 처리를 한다. 히스토그램을 기반으로 색보정을 하는 경우, 충분한 색온도 변환이 이루어 지지 않는 단점이 있으며, 본 논문에서는 히스토그램을 사용하지 않고 색온도 변환을 중심으로 색보정하는 방법을 제안한다.

• Journal of Korea Society of Digital Industry and Information Management
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• v.8 no.3
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• pp.97-124
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• 2012

This paper analyzes qualitatively the stereo 3D content factors causing viewer's discomfort. For this, we perform a subjective test that each subject strokes a specific key whenever he (she) feels discomfort during watching a stereo 3D contents. Also we extract the data for the factors in the 3D contents to obtain their quantitative values and the amounts of the temporal changes. Those two sets of data are used to analyze the contents to find the factors which cause viewer's discomfort. The factors to be considered are the amount and the frequency of the disparity changes, story of the contents, situation or environments of a scene, movement and the position of the camera, color and luminance information as well as disparities themselves. We analyse the various strong and weak factors and their composites to find how much discomfort each factor or composite causes. We also show the situations and their related factors that causes less discomfort than the amount of their disparities.

• Journal of Broadcast Engineering
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• v.19 no.5
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• pp.616-626
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• 2014

In this paper, we introduce a real-time stereo-to-multiview conversion system using FPGA and GPU. The system is based on two different devices so that it consists of two major blocks. The first block is a disparity estimation block that is implemented on FPGA. In this block, each disparity map of stereoscopic video is estimated by DP(dynamic programming)-based stereo matching. And then the estimated disparity maps are refined by post-processing. The refined disparity map is transferred to the GPU device through USB 3.0 and PCI-express interfaces. Stereoscopic video is also transferred to the GPU device. These data are used to render arbitrary number of virtual views in next block. In the second block, disparity-based view interpolation is performed to generate virtual multi-view video. As a final step, all generated views have to be re-arranged into a single image at full resolution for presenting on the target autostereoscopic 3D display. All these steps of the second block are performed in parallel on the GPU device.

• Journal of Broadcast Engineering
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• v.13 no.5
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• pp.596-601
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• 2008

In this paper, we propose a new scheme to generate region-of-interest (ROI) enhanced depth maps in the hybrid camera system, which is composed of a low-resolution depth camera and a high-resolution stereoscopic camera. The proposed method creates an ROI depth map for the left image by carrying out a three-dimensional (3-D) warping operation onto the depth information obtained from the depth camera. Then, we generate a background depth map for the left image by applying a stereo matching algorithm onto the left and right images captured by the stereoscopic camera. Finally, we merge the ROI map with the background one to create the final depth map. The proposed method provides higher quality depth information on ROI than the previous methods.

• The Journal of the Korea Contents Association
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• v.15 no.2
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• pp.31-39
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• 2015

2D-to-3D video conversion vests 3D effects in a 2D video by generating stereoscopic views using depth cues inherent in the 2D video. This technology would be a good solution to resolve the problem of 3D content shortage during the transition period to the full ripe 3D video era. In this paper, a low-complexity depth generation method for 2D-to-3D video conversion is presented. For temporal consistency in global depth, a pattern-based depth generation method is newly introduced. A low-complexity refinement algorithm for local depth is also provided to improve 3D perception in object regions. Experimental results show that the proposed method outperforms conventional methods in terms of complexity and subjective quality.

• ETRI Journal
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• v.36 no.2
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• pp.264-270
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• 2014

This paper introduces a novel repetitive delivery scheme for the left and right views in service-compatible (SC) 3D video that provides full backward compatibility to a legacy DTV system while retaining HD 3D visual quality without additional bandwidth or a codec over the legacy broadcasting channel. The proposed SC delivery scheme transmits individual view sequences of a 3D video in interlaced form, that is, a left-view sequence of a 3DTV program to be used repeatedly is transmitted first and stored locally, and the right-view sequence of the 3D program is then transmitted. This paper specifically describes the signaling, synchronization, and storage format methods used to validate the proposed SC delivery scheme. The experiment results show that the proposed SC delivery scheme can be effectively applied for an SC 3DTV service without degrading the DTV quality using only legacy DTV platforms.