• Journal of Broadcast Engineering
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• v.16 no.2
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• pp.360-371
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• 2011

T-DMB hybrid data service provides advanced data services while maintaining backward compatibility with legacy T-DMB receivers by using hybrid BIFS technology enabling distributed delivery of scene description information and object description information. This paper presents the hybrid service authoring framework implementing hybrid BIFS technology for creating contents for distributed delivery, and the results of experiments by using it. Hybrid service authoring framework is comprised of service creation system, service management system, and contents offering system. It enables the creation of combined hybrid data service and the splitting of the contents into two parts for ecah delivery network, data for broadcasting network and the data for mobile network. It also enables the managements of the contents. The feasibility of advanced data services while maintaining backward compatibility with the legacy T-DMB receiver has been proved by the contents created by using the hybrid authoring framework presented in this paper.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2014.06a
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• pp.230-231
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• 2014

Compressive sensing is a new sampling technique, which allows to sample a signal under the Nyquist-Shannon sampling rate. For block-based compressive sensing, a hybrid sensing matrix which contains low-frequency patterns in addition to the random Gaussian numbers is good for exploiting typical property of natural images. By noting that MH-BCS-SPL is well known for its good recovery performance, this paper investigates effect of the hybrid sensing matrix on MH-BCS-SPL in the sense of how large portion of low-frequency patterns can provide performance improvement.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.108-109
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• 2011

지상파DMB 방송 서비스는 기본적인 비디오 서비스뿐만 아니라 다양한 멀티미디어 방송 서비스를 제공하는 모습으로 발전하고 있다. 그러나 방송망이 가지는 제한된 대역폭으로 인하여 방송망을 통한 다양한 멀티미디어 방송 서비스를 제공하는 것이 어려운 실정이다. 최근 들어, 스마트 폰과 같은 스마트 단말기들의 등장으로 인하여 무선통신망을 통한 다양한 서비스를 제공하는 것이 용이해 졌다. 이러한 시점에서 지상파DMB 방송망과 무선통신망을 결합하는 새로운 방통융합형 서비스의 등장이 가능하게 되었다. 본 논문에서는 지상파DMB와 무선통신망을 포함하는 Hybrid 모바일 방송 시스템의 구성을 제안한다. 또한 이러한 시스템을 기반으로 제공 가능한 다양한 서비스 모델들을 제시한다.

• Journal of Broadcast Engineering
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• v.18 no.2
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• pp.237-248
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• 2013

Hybrid broadcasting environment is convergence of broadcasting and communication environment. In hybrid broadcasting environment, a number of media can be delivered using both broadcasting channel and other network unlike traditional broadcast environment that is able to deliver a couple of media by the limited bandwidth. Now, starting with smart TV, hybrid broadcasting environment combining broadcasting channel and IP network is established, and a variety of services are appearing. Moreover, the services using hybrid broadcasting environment are expected to appear soon for the other smart terminals such as smart phone and tablet PC. Scene composition is one of the methods that can consume effectively a number of media delivered from hybrid broadcasting environment. Using scene composition, multiple media can be consumed through the specified presentation time and space. Therefore, in this paper, it proposes the scene composition technology that is suitable for hybrid broadcasting environment and smart terminals. However, the spatial composition and temporal composition of media using script language and style language of HTML5 might increase the complexity of processing, and cause limitation of avaliable terminals. Also, a document of HTML5 can describe only one scene. By these reason, the proposed scene composition technology extends HTML5 in order to provide the spatial and temporal composition of media and description of multiple scene through markup language. In addition, it includes the extension of HTML5 in terms of utilization in hybrid broadcasting environment. For this proposal, this paper describes the technology of HTML5 and proposed scene composition. Also, it verifies the scene composition with both implementations and experiments.

• Journal of Broadcast Engineering
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• v.9 no.1
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• pp.91-94
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• 2004

The vergence controls of the parallel stereoscopic camera need only the disparity information of left and right images in horizontal direction. This paper proposed past and precise disparity value for stereoscopicimage pair in horizontal direction and the algorithm which can abstract disparity information through the HCF(Hybrid Cepstral Filter) for sign information. The proposed disparity information- extracting algorithm can obtain accurate disparity value of horizontal direction and signinformation by using both the one dimension cepstral filter which uses vertical projection data of left and right Image and the two dimension cepstral filter which uses down sampled image.

• Journal of Broadcast Engineering
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• v.17 no.2
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• pp.262-269
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• 2012

Hybrid-ARQ and opportunistic relaying are the widely used schemes for obtaining diversity gain in wireless communications. In opportunistic relaying, channel state information(CSI) between relays and destination is required to select the best relay. But if the destination moves very fast, the CSI becomes outdated. In this paper, performance of hybrid-ARQ based opportunistic relaying with outdated CSI is analyzed in outage probability and throughput perspective. The analysis is verified by computer simulations.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2012.07a
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• pp.466-467
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• 2012

DMB 는 이동 중에 멀티미디어를 시청할 수 있는 이동 멀티미디어 방송이다. 기술의 발전으로 최근 출시되고 있는 휴대용 기기에는 기본적으로 DMB 를 수신할 수 있고, 사용자는 어디든 이동 하며 DMB Contents 를 즐길 수 있다. 하지만 사용자가 DMB Contents 를 수신할 수 없는 지역으로 이동하면 DMB Contents 를 수신 할 수 없다. 이러한 단점을 극복하기 위해서, 휴대용 기기는 기본적으로 장착되어 있는 무선 네트워크 모듈을 통하여 Internet 의 DMB System 에 접속하고, DMB System 은 사용자 요구에 따라 DMB Contents 를 전송할 수 있는 Hybrid DMB System 이 필요하다. 이러한 Hybrid DMB System 은 Internet 을 통하여 DMB Contents 를 전송하게 되고, 결국 휴대용 기기는 장착되어 있는 무선 네트워크를 이용하여 DMB Contents 를 수신한다. 하지만 휴대용 기기에 장착되어 있는 무선 네트워크 모듈이 다양하기 때문에, 각 무선 네트워크의 전송 특성을 살펴볼 필요가 있다. 본 논문에서는 다양한 무선 네트워크 중 802.11 에서 DMB Contents 를 전송하고, 네트워크의 전송 특성을 살펴본다.

• Broadcasting and Media Magazine
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• v.16 no.1
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• pp.17-29
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• 2011

• Broadcasting and Media Magazine
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• v.16 no.1
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• pp.8-16
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• 2011

• Journal of Broadcast Engineering
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• v.16 no.4
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• pp.602-613
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• 2011

In this paper, we propose a hybrid stereoscopic camera system which acquires and utilizes stereoscopic images from two different camera modules, the main-camera module and the sub-camera module. Hybrid stereoscopic camera can effectively reduce the price and the size of a stereoscopic camera by using a relatively small and cheap sub-camera module such as a mobile phone camera. Images from the two different camera modules are very different from each other in aspects of color, angle of view, scale, resolution and so on. The proposed system performs an efficient hybrid stereoscopic image registration algorithm that transforms hybrid stereoscopic images into normal stereoscopic images based-on camera geometry. As experimental results, the registered stereoscopic images and applications of the proposed system are shown to demonstrate the performance and the functionality of the proposed camera system.