• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.5A
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• pp.537-545
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• 2006

As the T-DMB service is launched, some service requirements become necessary to send local programs such as advertisement and specific programs at the local broadcasting station while re-transmitting the broadcasting signal coming from the central or other station. In this paper, we propose a signalflow required for the effective splicing in the T-DMB system which usesboth MPEG-2 and MPEG-4 system specifications, and we illustrate the reconfiguring process into the ensemble stream that is widely used for the transmission of the T-DMB signal. Moreover, its performance is confirmed by comparing the images decoded at the recevier when the transport stream is swiched by using the splicer implemented through the proposed techniques.

• Journal of Korea Multimedia Society
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• v.11 no.10
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• pp.1347-1358
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• 2008

A blind video watermarking scheme for providing safety, authenticity, and copyright protection is proposed in this paper, which is robust to MPEG-4 SVC and multimedia transcoding. In proposed method, embedding and detecting of watermark is performed based on base layer with considering spatial SVC. To be robust from temporal SVC, our method embeds repeatedly a permutated character with ordering number per one frame. Also for robustness from multimedia transcoding and FGS, the method is embedded watermark in low middle frequency of each frame adaptively based on DCT in ROI. Through experimental results, invisibility of the watermark is confirmed and robustness of the watermark against the spatial SVC, temporal SVC, FGS and video transcoding between MPEG-2 and MPEG-4 SVC is also verified.

• Journal of Broadcast Engineering
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• v.24 no.2
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• pp.299-305
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• 2019

In ISO MPEG, MPEG-H has been standardized to smoothly deliver huge volume of ultra-high resolution videos over heterogeneous network environments for the consumers. In the MPEG-H standard, MMT(MPEG Media Transport) protocol is the next generation MPEG media transport technology to provide hybrid media delivery over heterogeneous environments. It is important to sustain accurate media synchronization to provide ultra-high resolution video services over heterogeneous network environments. In this paper, we propose and verify an in-band media synchronization scheme to circumvent the problem of additional session setup and excessive traffic problems of the conventional out-of-band media synchronization supported by the MMT technology.

• The Journal of the Acoustical Society of Korea
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• v.28 no.7
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• pp.599-609
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• 2009

An overview of the recently finalized multi-channel audio coding standard MPEG Surround is provided. This audio coding standard downmixes multi-channel signals to mono or stereo signals and, simultaneously, extracts spatial parameters for its encoding process. In its decoding process, it reconstructs multi-channel signals based on the downmix signals and spatial parameters. Since the downmix signals are coded in conventional audio coding format such as AAC and MP3 and the spatial parameters require a small amount of information MPEG Surround guarantees high sound quality multi-channel audio at low bit rates. Besides, it is backward-compatible to conventional audio coding techniques because the downmix signals can be played on portable audio devices ignoring the spatial parameter information. In this paper, Part 1 presents an overview of the basic structure of MPEG Surround and Part 2 describes various modes and tools including the binaural mode which supports the virtual 5.1-channel playback via headphones or earphones. The listening test results by various companies and organizations are also presented.

• Journal of Broadcast Engineering
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• v.9 no.2
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• pp.142-150
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• 2004

MPEG-4 AVC is an international video coding standard that is being developed. The standardization is mainly targeted at a very high compression ratio. MPEG-4 AVC is a general video coding technology that may be used in various applications. Therefore, MPEG-4 AVC needs an efficient rate control method to be applied in various communication environments. This paper is based on the rate control method that considers human visual characteristic. In this paper, we propose the constant bit rate control method using adaptive quantization and scene change detection. Experiments performed using various test images and experimentation results exhibits a favorable performance over existing rate control methods.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.1107-1111
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• 2005

The DVR system realization with watermarking and MPEG-4 for real time processing speed improvement is presented in this paper. For the real time processing the system is used the DSP processor, Quick DMA for data transmission, watermarking for security and MPEG-4 compression for facility. The algorithms are that the operational structure has the internal memory of processor, and the optimal realization is suitable to form the DSP processor structure r processed for the iterative operations. The experimental result shows the real time processing is improved 12% over for the D1 image in comparison with the other system.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10a
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• pp.203-208
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• 2006

본 논문에서는 MPEG-21 프레임워크를 Peer-to-Peer Network 상에서 구동시킬 때의 문제점을 해결하면서, P2P의 장점을 최대한 이용할 수 있도록 하는 P2P 방식의 디지털 권한 관리 시스템(P2PDRMEngine)을 설계한다. MPEG-21 프레임워크의 여러 구성 요소들 중 IPMP(Intellectual Property Management and Protection components), DI(Digital Item), Multimedia Contents 등의 구조에 몇 가지 요소를 추가하여 P2PDRMEngine과 MPEG-21 프레임워크가 서로 유기적인 동작을 할 수 있도록 설계하고 또한, DI를 생산, 배포, 사용할 때 사용자에게 편리성을 제공 해주는 기능도 고려한다. P2PDRMEngine은 기존의 MPEG-21 프레임워크의 수행에 지장을 주지 않으면서 보안적인 측면과 요소 간의 기능을 강화하는 데 초점을 맞추어 설계한 시스템이다.

• Information and Communications Magazine
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• v.30 no.5
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• pp.11-17
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• 2013

지난 수 십년간 MPEG은 MPEG-2 TS나 ISO 파일 포맷과 같은 멀티미디어 전송을 위한 기술 표준을 성공적으로 개발하여 왔다. 인터넷을 통한 멀티미디어 서비스의 폭발적인 증가에 따른 멀티미디어 서비스 환경의 변화는 멀티미디어 전송 표준에 대한 새로운 요구 사항을 가져왔다. 이러한 요구 사항의 주요 예로는 멀티미디어 구성 요소에 대한 유연하고 동적인 접근 및 저장용 포맷과 패킷화 전송용 포맷 간의 용이한 변환, 그리고 캐쉬나 단말내 저장 장치를 포함하는 다양한 공급자로부터의 멀티미디어 구성 요소의 복합적인 활용을 들 수 있다. MPEG은 이러한 요구 사항에 대응하기 위해서 MPEG Media Transport(MMT) 표준을 개발하고 있따. 본고에서는 새로운 요구 사항과 관련된 MPEG-2 TS나 RTP와 같은 기존 멀티미디어 전송 기술의 도전과 한계를 살펴보고 MMT가 이러한 도전과 한계를 극복하고 있는지에 대해 간략히 소개하고자 한다.

• Proceedings of the IEEK Conference
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• 2002.07a
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• pp.125-128
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• 2002

In this paper, a new interactive TV service model is proposed. The MPEG-4 system is specified for composing and managing various object streams including user interactions. The data broadcasting model supporting user interactions is designed using MPEG-4 system in our proposal. We evaluate possibility of proposed service model using simulation player. This player supports MPEG-2 TS which contains MPEG-2 video and AC-3 audio streams as a main service and MPEC-4 system data as interactive services as well as user specific EPG information, and XML data, etc as supplemetary services. The player also supports a multi-channel environment. The synchronization between audio and visual data is achieved by DTS and PTS in TS.

• Proceedings of the KIEE Conference
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• 2004.11c
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• pp.268-270
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• 2004

There are various researches on MPEG techniques. MPEG technique is used to digital TV(DTV) and internet image communication. Connection method between server and client is usually using wire. Applications may be expanded, if wireless technology is used between server and client system. In this paper, Bluetooth is used for connection method between server and client. Bluetooth offers fast and reliable transmissions of both voice and data over the globally available 2.4GHz ISM (Industrial, Scientific and Medical) band. One of the major application purposes of Bluetooth is the cable replacement for mobile and peripheral devices. Bluetooth has the advantage of small size, low power and low cost. It has the disadvantage of limited bandwidth and limited range. In order to transfer effectively image Information between server and client using Bluetooth, we apply MPEG-2 and MPEG-4 image compression techniques and the results are compared with each other.