• Journal of Broadcast Engineering
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• v.14 no.6
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• pp.807-810
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• 2009

This paper deals with a real-time image based relighting system for tangible video teleconference. The proposed image based relighting system renders the extracted human object using the virtual environmental images. The proposed system can homogenize virtually the lighting environments of remote users on the video teleconference, or render the humans like they are in the virtual places. To realize the video teleconference, the paper obtains the 3D object models of users in real-time using the controlled lighting system. In this paper, we use single color camera and synchronized two directional flash lights. Proposed system generates pure shading images using on and off flash images subtraction. One pure shading reflectance map generates a directional normal map from multiplication of each reflectance map and basic normal vector map. Each directional basic normal map is generated by inner vector calculation of incident light vector and camera viewing vector. And the basic normal vector means a basis component of real surface normal vector. The proposed system enables the users to immerse video teleconference just as they are in the virtual environments.

• KIPS Transactions on Computer and Communication Systems
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• v.2 no.10
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• pp.437-444
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• 2013

Recently, there are several attempts to save temporal, spatial and paper resources through mobile teleconference. However, present application-based mobile solutions have limited access, and are occasionally not working because of its operating system dependency. In recent times, several researchers attempt to develop mobile teleconference systems that can operate in all operating systems. It is still required to install proprietary applications to sync screens in user device. In this paper, we propose a full duplex and real-time data mirroring technology based on hybrid web that allows syncing screens without application installation, and operates in all mobile devices.

• Korean Journal of Computational Design and Engineering
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• v.12 no.2
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• pp.126-136
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• 2007

Teleconferences have been used in business sectors to reduce traveling costs. Traditionally, specialized telephones that enabled multiparty conversations were used. With the introduction of high speed networks, we now have high definition videos that add more realism in the presence of counterparts who could be thousands of miles away. This paper presents a new technology that adds even more realism by telecommunicating with hand gestures. This technology is part of a teleconference system named SMS (Smart Meeting Space). In SMS, a person can use hand gestures to manipulate meeting data that could be in the form of text, audio, video or 3D shapes. Fer detecting hand gestures, a machine learning algorithm called SVM (Support Vector Machine) has been used. For the prototype system, a 3D interaction environment has been implemented with $OpenGL^{TM}$, where a 3D human skull model can be grasped and moved in 6-DOF during a remote conversation between distant persons.

• Proceedings of the KOSOMBE Conference
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• v.1996 no.05
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• pp.147-150
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• 1996

We are developing a teleconference system based on 3D medical image. The system consists in three sub-systems : conference operating system, medical image processing system and database management system. It makes it possible efficient computer-supported coorperative work among remote multi-located hospitals. In this paper, we present functions of each subsystem that have implemented until now.

• Proceedings of the Korea Society of Design Studies Conference
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• 2002.11b
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• pp.84-85
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• 2002

• ETRI Journal
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• v.18 no.1
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• pp.41-51
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• 1996

The goal of telecommunication may be to enable the participants in distant places to communicate with each other in an environment as if they were in the same room. This paper introduces the reason why realistic audio display is useful in telecommunication, reviews some approaches to its implementation, and proposes an audio teleconference model which realizes a two-way telecommunication with realistic sensations using binaural and auralization techniques.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1996.04a
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• pp.703-705
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• 1996

CALS (Commerce At the Light Speed) is considered one of the most important concepts in the 21th century. In the period of CALS, the roles of telecommunication companies to prepare for CALS period. They are: development of facilities management, participation of virtual enterprise prototype, providing teleconference tool, execution of BPR, development fo customer management system.

• The Journal of the Acoustical Society of Korea
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• v.15 no.1E
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• pp.77-83
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• 1996

The goal of telecommunication may be to enable the participants in distant places to communicate with each other in an environment as if they were in the same room. This paper introduces the reason why realistic audio display is useful in telecommunication, reviews some approaches to its implementation, and proposes an audio teleconference model which realizes a two-way telecommunication with realistic sensations using binaural and auralization techniques.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• v.12 no.1
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• pp.33-39
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• 2008

We consider a queueing system fed by a superposition of multiple discrete autoregressive processes of order 1, and propose an approximation method to estimate the overflow probability of the system. Numerical examples are provided to validate the proposed method.

• Journal of the Semiconductor & Display Technology
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• v.7 no.3
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• pp.45-49
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• 2008

Face detection and tracking technology on video sequence has developed indebted to commercialization of teleconference, telecommunication, front stage of surveillance system using face recognition, and video-phone applications. Complex background, color distortion by luminance effect and condition of luminance has hindered face recognition system. In this paper, we have proceeded to research of face recognition on video sequence. We extracted facial area using luminance and chrominance component on $YC_bC_r$ color space. After extracting facial area, we have developed the face recognition system applied to our improved algorithm that combined PCA and LDA. Our proposed algorithm has shown 92% recognition rate which is more accurate performance than previous methods that are applied to PCA, or combined PCA and LDA.