• Proceedings of the Korean Society of Computer Information Conference
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• 2012.07a
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• pp.105-106
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• 2012

일반적으로 CG 합성이라 하면 '자연스러운' 것을 잘된 CG영상이라고 한다. 이 때 촬영된 영상이 정지화면 일 수 만은 없다. 카메라가 움직이는 영상에서는 CG합성도 실사카메라 무빙에 맞게 정확한 정합이 되어야 자연스러운 영상이 된다. 이를 위해 합성단계에서 작업할 때 3D 카메라 트래킹 기술이 필요하다. 카메라트래킹은 촬영된 실사영상만으로 카메라의 3차원 이동정보와 광학적 파라미터 등 촬영시의 3차원 공간을 복원하는 과정을 포함하고 있다. 이 과정에서 카메라 트래킹에 대한 오류의 발생으로 실사와 CG의 합성에 대한 생산성에 많은 문제점을 가지고 있다. 본 논문에서는 이러한 문제를 해결하기 위하여 소프트웨어에서 트래킹데이터를 보정하는 방법을 제안한다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06b
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• pp.361-363
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• 2006

객체 기반의 3차원 입체 변환 기법은 연속적으로 입력되는 2D 동영상에서 객체를 추출하여 입체 영상으로 변환하는 기법을 말한다. 두 눈에 투시되는 각 객체마다 서로 다른 시차를 가져야 입체감을 느낄 수 있다. 따라서 2D 영상에서 정확한 객체를 추출하는 것이 중요하다. 본 논문에서는 프레임간의 차이를 이용하여 대략의 움직이는 객체 영역을 얻고, 그래프 및 알고리즘을 사용하여 정확하고 안정적인 객체를 자동으로 추출한다. 스크린과 양안 사이의 거리를 고려하여 입체 영상을 만들어 낸다. 후처리 단계에서는 입체 영상을 만들어 내면서 생긴 빈 공간을 채운다. 실험에서는 2D 영상으로부터 입체 영상을 생성한 것을 보여 준다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07b
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• pp.826-828
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• 2005

본 논문에서는 이질적인 수신단말들에 효율적인 스테레오 영상전송을 위한 시공간적 계위를 이용한 부호화 방법을 제시하였으며, 각각의 시간적, 공간적 계위의 오버헤드를 분석하였다. 제시된 부호화기는 유연성있는 스테레오 비디오 서비스를 위해서 하나의 영상에 각각 시간적, 공간적으로 확장 가능한 추가적인 비트열을 정의하였다. 실험을 통하여 공간적 계위 오버헤드는 시간적 계위 오버헤드에 비해 상대적으로 크지만, 스테레오 부호화기의 양안차 예측으로 인해 많이 감소됨을 보였다. 제안된 스테레오 비디오 부호화기는 다양한 디스플레이 장치 및 네트워크 환경을 가지는 유비쿼터스 컴퓨팅 환경을 위한 효율적인 스테레오 비디오 전송 서비스에 활용될 것으로 기대된다.

• Smart Media Journal
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• v.1 no.3
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• pp.36-42
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• 2012

Recently, the smart applications, such as smart phone and smart TV, become a hot issue in IT consumer markets. In particular, the smart TV provides 3D video services, hence efficient coding methods for 3D video data are required. Three-dimensional (3D) video involves stereoscopic or multi-view images to provide depth experience through 3D display systems. Binocular cues are perceived by rendering proper viewpoint images obtained at slightly different view angles. Since the number of viewpoints of the multi-view video is limited, 3D display devices should generate arbitrary viewpoint images using available adjacent view images. In this paper, after we explain a view synthesis method briefly, we propose a new algorithm to compensate view synthesis errors around object boundaries. We describe a 3D warping technique exploiting the depth map for viewpoint shifting and a hole filling method using multi-view images. Then, we propose an algorithm to remove boundary noises that are generated due to mismatches of object edges in the color and depth images. The proposed method reduces annoying boundary noises near object edges by replacing erroneous textures with alternative textures from the other reference image. Using the proposed method, we can generate perceptually inproved images for 3D video systems.

• Journal of Broadcast Engineering
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• v.19 no.5
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• pp.687-698
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• 2014

ATSC is currently working on standardization of hybrid 3DTV broadcasting service in heterogenous network environment after completion of service-compatible 3DTV broadcasting service standard based on broadcasting channel. This paper proposes a convergence 3D video broadcasting method on broadcasting and IP network while guaranteeing a Full-HD 3D quality without degrading the image quality of legacy DTV. Specifically, this paper describes transmission of the 3D additional video using the ISO/IEC 23009-1 DASH, robust synchronization method under heterogenous network environments and system target decoder model for hybrid 3DTV receiver. Based on experimental results, we confirm that proposed technologies can be used as a core technology in the hybrid 3DTV standardization and a reference model for a development of hybrid 3DTV encoder and receiver.

• Journal of Broadcast Engineering
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• v.17 no.1
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• pp.49-59
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• 2012

Although 3D stereoscopic movies had been paid attention to a few times since the 1900's, the interest had not been last. Most researchers pointed out the reason came from human factors because the early in the 3D technology growth had to develop technological possibility to realize 3D videos and ignore the importance viewers' perspective. In the 2D video research, many studies have explored the factors which make people got immersed or involved and felt visual fatigue, but they have not been the main issues in the 3D research until now. The present research believes human factor issue is one of the most important parts to accelerate 3D industry and thus, we try to make reliable and valid assessments to evaluate 3D video which are perceived characteristics, impression, and presence.

• Journal of Korea Multimedia Society
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• v.16 no.9
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• pp.1109-1118
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• 2013

Recently, stereoscopic three-dimensional(S3D) movie and video are becoming globally popular. However, there are some people who could not perceive 3D depth information well. Traditional stereopsia test tools could not analyze the subject's perceived depth accurately. Therefore, it is necessary to have a test tool that accurately measures the degree of perceived depth of subjects. In this paper, we suggested a 3D content depth measuring instrument and produced suitable 3D contents for the instrument. We measured subjects' perceived depth of 3D foreground objects in terms of $+1^{\circ}$, $-1^{\circ}$, $-2^{\circ}$ binocular disparity and compared the measured values with the theoretical values. Measured values were slightly bigger than the theoretical values. Deviation between the measured values and theoretical values increased with extrusion distances.

• Journal of Broadcast Engineering
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• v.19 no.1
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• pp.44-55
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• 2014

The goal of 3D stereoscopy is not only to maximize positive experiences (such as sense of realism) by adding depth information to 2D video but to also minimize negative experiences (such as fatigue). This study examines the impact of different depth levels induced by adjusting 3D camera convergences on positive and negative experiences and finds an optimal parameter for viewers. The results show that there are significant differences among depth levels on spatial involvement, realistic immersion, presence, depth perception, screen transmission, materiality, shape perception, spatial extension and display perception. There are also significant differences for fatigue and unnaturalness. This study suggests that reducing the camera convergence angle of an object by $0.17^{\circ}$ behind the object is the optimal parameter in a 3D stereoscopic setting.

• Journal of Korea Game Society
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• v.11 no.5
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• pp.13-22
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• 2011

Advances in display technology, stereoscopic (S3D) in the development of social interest in the content development approach is high but it does not make the standardization of interactive 3D content creation performance is very poor. In this paper, real-time video input from an infrared camera that is based on eye tracking implementation user interface developed 3D interactive adventure game "HowSee" was the process of developing skills in the process, an efficient 3D content production methods were presented. unnormalized S3D-based game content production process on how this development occurred in the trial and how to troubleshoot S3D games, etc. to streamline content creation can be a basis for.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.12
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• pp.2146-2152
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• 2008

In In this paper, we proposed a new JPEG2000 codec using multiresolution-based rendering (MRBR) technique for video compression of 3-dimensional digital cinema. We introduced discrete wavelet transform (DWT) for stereoscopic image and stereo matching technique in the wavelet domain. The disparity was extracted using stereo matching and transmitted with the reference (left) image. Since the generated right image was degraded by the occlusion lesion, the residual image which is generated from difference between the original right image and the generated one was transmitted at the same tine. The disparity data was extracted using the dynamic programming method in the disparity domain. There is high correlation between the higher and lower subbands. Therefore we decreased the calculation amount and enhanced accuracy by restricting the search window and applying the disparity information generated from higher subband.