• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.379-380
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• 2018

본 논문에서는 레이싱 게임에서 도시 맵을 빠르게 생성 및 합성할 수 있는 알고리즘을 제안한다. 레이싱 분류의 게임은 고정된 영역이 아닌 넓은 영역을 이동하는 특징이 있지만 이를 위한 맵을 디자인하고 개발하는 것은 많은 시간을 요구한다. 이 문제는 큰 지형 맵을 전처리 과정에서 생성함으로써 완화 시킬 수 있지만 고정적인 맵은 게임을 지루하게 만들며 그렇다고 다양한 맵을 모두 전처리 과정에서 처리하는 것은 비효율적이다. 이 같은 문제를 해결하기 위해 우리는 전처리 과정에서 지형 패턴을 만들어 실시간에 맵을 생성하고 다양한 맵을 랜덤하게 합성 할 수 있는 기법을 제안한다. 또한, View-dependent기법을 제안하는 프레임워크를 통합시켜 불필요한 렌더링 계산을 줄임으로써 효율성을 증대시킨다. 본 연구는 Unity 게임 엔진에서 개발했으며 레이싱 게임뿐만 아니라 다양한 콘텐츠에서 활용할 수 있다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.452-454
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• 2015

This paper provides the coding performance comparisons of depth map resolution in 3D video system. In multiview plus depth map system, depth map is used for synthesis view rendering, and affects to synthesis views quality. In the paper, we show the experimental results as depth map resolution in 3D video system, and show performance variation as dilation filter.

• Journal of the Korea Society of Computer and Information
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• v.24 no.9
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• pp.59-67
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• 2019

The service composition based on Service-Oriented Architecture(SOA) can make us view various machines or its functionalities in the Web or Internet-of-Things environment as 'service', and efficiently create new value-added services that users want by compositing different services if there is no service to satisfy the client. The service composition problem with respect to behavioral descriptions deals with the automatic synthesis of a coordinator service that controls a set of services to reach a goal state. Despite its importance, however, solving the service composition problem with only partial observations remains to be doubly exponential in the number of variables in service descriptions, rendering any attempts to compute an exact solution for modest size impractical. Toward this challenge, in this paper, we propose novel approximation-based approaches using abstraction methods. We empirically validate that our proposals can solve realistic problems efficiently.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2008.11a
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• pp.113-116
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• 2008

본 논문에서는 다시점 비디오(multi-view video)에서 보다 다양한 시점을 제공하기 위한 가상 시점 비디오 생성 기법을 제안한다. 제안하는 가상 시점 비디오 생성 기법은 우선적으로 대칭적 신뢰 전파 기법(symmetric belief propagation)을 기반으로, 각 시점의 깊이 정보 및 폐색 영역(occlusion region)을 추출하기 위해서 에너지를 최소화한다. 추출된 깊이 정보 및 에너지를 이용하여 참조하는 시점 간의 가중치를 적용하여, 새로운 가상 시점의 비디오를 생성하고, 추출된 폐색 영역의 값을 이용하여, 가상 시점의 비디오를 보정하는 가상 시점 비디오 생성 기법을 제안한다. 또한 제안하는 알고리즘을 한정된 중간 시점 영상에서 임의의 가상 시점으로 확장하여, 임의의 두 시점 간의 자유로운 시점(free-view point)을 제공함을 확인한다. 실험을 통하여 제안하는 기법이 다시점 비디오에서 높은 화질의 가상 시점 비디오를 제공함을 확인한다.

• The Journal of Korea Robotics Society
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• v.1 no.2
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• pp.125-134
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• 2006

The problem of establishing the servo system to reach the desired location keeping all features in the field of view and following a straight line is considered. In addition, robustness of camera calibration parameters is considered in this paper. The proposed approach is based on switching from position-based visual servoing (PBVS) to image-based visual servoing (IBVS) and allows the camera path to follow a straight line. To achieve the objective, a pose estimation method is required; the camera's target pose is estimated from the obtained images without the knowledge of the object. A switched control law moves the camera equipped to a robot end-effector near the desired location following a straight line in Cartesian space and then positions it to the desired pose with robustness to camera calibration error. Finally simulation results show the feasibility of the proposed visual servoing technique.

• ETRI Journal
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• v.38 no.6
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• pp.1114-1123
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• 2016

Multi-view video plus depth (MVD) has been widely used owing to its effectiveness in three-dimensional data representation. Using MVD, color videos with only a limited number of real viewpoints are compressed and transmitted along with captured or estimated depth videos. Because the synthesized views are generated from decoded real views, their original reference views do not exist at either the transmitter or receiver. Therefore, it is challenging to define an efficient metric to evaluate the quality of synthesized images. We propose a novel metric-the reduced-reference quality metric. First, the effects of depth distortion on the quality of synthesized images are analyzed. We then employ the high correlation between the local depth distortions and local color characteristics of the decoded depth and color images, respectively, to achieve an efficient depth quality metric for each real view. Finally, the objective quality metric of the synthesized views is obtained by combining all the depth quality metrics obtained from the decoded real views. The experimental results show that the proposed quality metric correlates very well with full reference image and video quality metrics.

• Journal of Internet Computing and Services
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• v.20 no.1
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• pp.47-55
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• 2019

Free-viewpoint video (FVV) service provides multi viewpoints of contents and synthesizes intermediate video files which are not captured on some view angles so that enables users to watch as they choose wherever they want. Synthesizing video is necessary technique to provide FVV video service, because every video of the FVV contents for different view angles cannot be stored to the content server physically. For the reason, fast view synthesis can improve the quality of video service and increase user's satisfaction. One of the studies for FVV service, a method was proposed to transmit FVV service based on DASH (Dynamic Adaptive Streaming over HTTP). There is big advantage on using DASH that it is commonly used to transport video service. However, the method was only a conceptual proposal, so it is difficult to implement the system using the proposal. In this paper, we propose an implementation method to provide real-time FVV service smoothly. We suggest a system structure and operation method on the server and client side in detail, which is to be applicable to synthesize video quickly. Also, we suggest generating FVV service map additionally which controls a FVV service overall. We manage real-time information of the whole service through the service map. The service can be controlled by reducing the possible delay from network situation.

• Journal of Broadcast Engineering
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• v.19 no.5
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• pp.713-725
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• 2014

Multi-view and 3D video technologies for a next generation video service are widely studied. These technologies can make users feel realistic experience as supporting various views. Because acquisition and transmission of a large number of views require a high cost, main challenges for multi-view and 3D video include view synthesis, video coding, and depth coding. Recently, JCT-3V (joint collaborative team on 3D video coding extension development) has being developed a new standard for multi-view and 3D video. In this paper, major tools adopted in this standard are introduced and evaluated in terms of coding efficiency and complexity. This performance analysis would be helpful for the development of a fast 3D video encoder as well as a new 3D video coding algorithm.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.11
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• pp.2765-2770
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• 2014

Rear view cameras which help to park or to drive backward has been distributed through after-market, but it is inconvenient because they do not provide views of left, right and front sides. Around view monitoring(AVM) systems which can monitor around vehicle at a glance have been developed and equipped by vehicle vendor but systematic studies on these systems is lack. While the AVM system which equipped on Infiniti cars of Nissan is adequate to monitor around vehicle at a glance, it has disadvantages that additional cabling because of using analog cables is required and image quality is lowered due to EMI/EMC intervention. The around view monitoring system implemented in this paper has advantages that there are no EMI/EMC problems because of using optical network and that cabling is simple because of using plug-and-play ways. Additionally, an advantage of MOST150 network is that camera nodes and display node can be easily installed in the form of plug-and-play.

• Archives of Pharmacal Research
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• v.12 no.2
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• pp.138-142
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• 1989

The nucleophilic substitution reaction of 6-chloro purines (I) with malononitrile and ethyl cyanoacetate is carried out in DMSO and in the presence of an alkali. The possible tautomeric-ylidene form for the products is considered and discussed in view of IR, UV, NMR and mass spectral determinations. The derivatives were tested for their antitumor activities.