• Journal of Broadcast Engineering
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• v.5 no.2
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• pp.176-187
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• 2000

MPEG-4 is a digital bit stream format and associated protocols for representing multimedia content consisting of natural and synthetic audio, video and object data. This paper describes an application where multiple audio/visual data stream are combined in MPEG-4 and transported via MPTG-2 transport streams(TS). Also, this paper describes how to convert MPEG-4 Over MPEG-2 TS bit streams into MP4 file which Is designed to contain the media information of an MPEG-4 presentation in a flexible, extensible format. MPEG-4 is presented in the form of audio-visual objects that are arranged into an audio-visual scene by means of a scene descriptor and is composed of the audio-visual objects by means of an object descriptor. These descriptor streams are not defined MPEG-2 TS. So. this paper focuses on handling of these descriptors and parsing TS streams to get MPEG-4 data. The MPEG-4 Over MPEG-2 TS to MP4 format converter is implemented in the demonstrated systems.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.6B
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• pp.1060-1067
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• 2000

MPEG-4 visual coding is an object-based system. The current video coding standards, H.261, MPEG-1, and MPEG-2 encode frame by frame. On the other hand, MPEG-4 separately encodes several objects, such as video objects and audio objects, in the same frame. Each transmitted object is decoded and composed in one frame. Shape coding is a process of coding visual objects in a frame. In this paper we present conformance test method for MPEG-4 shape decoders. This paper reviews the basic shape decoding standard, and proposes conformance test methods for BAB type decoder, and CAE decoder for intra and inter VOPs. Our test generates all possible cases of shape motion vector difference and context.

• Journal of Broadcast Engineering
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• v.11 no.4 s.33
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• pp.458-470
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• 2006

This paper describes issues and consideration on authoring of interactive multi-view visual content based on MPEG-4. The issues include types of multi-view visual content; scene composition for rendering; functionalities for user-interaction; and multi-view visual content file format. The MPEG-4 standard, which aims to provide an object based audiovisual coding tool, has been developed to address the emerging needs from communications, interactive broadcasting as well as from mixed service models resulting from technological convergence. Due to the feature of object based coding, the use of MPEG-4 can resolve the format diversity problem of multi-view visual contents while providing high interactivity to users. Throughout this paper, we will present which issues need to be determined and how they can be realized by means of MPEG-4 Systems.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.745-747
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• 2001

대역폭이 보장되지 않는 인터넷 상에서 대용량의 멀티미디어 데이터를 실시간으로 서비스하는 것은 여러가지 문제점을 안고 있다. 이에 미디어 데이터의 전송량을 줄이기 위한 연구로서 layered coding을 통한 스케일러블 전송에 대한 연구가 시도되었다. 본 논문에서는 MPEG 비디오 스트림의 스케일러블 전송을 가능케 하기 위하여 Temporal-Fidelity Scaling 기법을 제안하며, MPEG-4 Visual Component에서의 적용 방법에 대해 제안하고자 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.595-598
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• 2005

MPEG-4 Visual is, and international standard for the object-based video compression, designed for supporting a wide range of applications from multimedia communication to HDTV. To control the minimum decoding complexity required at the decoder, the MPEG-4 Visual standard defines the co-called video buffering mechanism, which includes three video buffer models. Among them, the VCV(Video Complexity Verifier) defines the control of the processing speed for decoding of a macroblock, there are two models: VCV and B-VCV distinguishing the boundary and non-boundary MB. This paper presents the evaluation results of decoding complexity by measuring decoding time of a MB for rectangular, arbitrarily shaped video objects and the various types of objects supporting the resolution of HDTV using the optimized MPEG-4 Reference Software. The experimental results shows that decoding complexity varies depending on the coding type and more effective usage of decoding resources may be possible.

• Journal of Broadcast Engineering
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• v.8 no.4
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• pp.351-364
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• 2003

In this paper, we propose visual Impairment descriptions for MPEG-21 digital item adaptation. The proposed visual impairment descriptions include low vision impairment and color vision deficiency. It is symptom-based description so that the description is systematic enough to sufficiently describe user's any kind of visual impairment characteristics and easy enough to describe for any user with visual impairment. In this paper, we performed some experiments with the proposed description in MPEG-21 digital item adaptation. The experiments showed that the proposed description Is effective to adapt visual resources In digital item for users with visual impairment and to give enhanced visual accessibility to them.

• Journal of Institute of Control, Robotics and Systems
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• v.11 no.12
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• pp.1083-1087
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• 2005

As development of digital technology, many kinds of multimedia data are used variously and requirements for effective use by user are increasing. In order to transfer information fast and precisely what user wants, effective retrieval method is required. As existing multimedia data are impossible to apply the MPEG-1, MPEG-2 and MPEG-4 technologies which are aimed at compression, store and transmission. So MPEG-7 is introduced as a new technology for effective management and retrieval of multimedia data. In this paper, we extract content-based features using color descriptor among the MPEG-7 standardization visual descriptor, and reduce feature data applying PCA(Principal Components Analysis) technique. We model the cerebral cortex and hippocampal neural network in engineering domain, and team content-based feature vectors fast and apply the hippocampal neural network algorithm to compose of optimized feature. And then we present fast and precise retrieval effect when indexing and retrieving.

• Journal of Sensor Science and Technology
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• v.25 no.4
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• pp.297-301
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• 2016

ISO/IEC JTC1/SC29WG11 MPEG has been standardizing UD(user description) to give a user personalized recommendation services. Besides, CD(context description), service description(SD), and recommendation description(RD) are recently being standardized by UD Adhoc Group in MPEG with an advanced UD to cope with needs of current and upcoming services such as augmented reality and social network. The descriptions was reflected to MPEG-UD WD(Working Draft) at MPEG $107^{th}$ meeting and the document was finally approved as international standard by national bodies with standard number(ISO/IEC IS 21000-22 UD) at $114^{th}$ MPEG meeting. In addition, reference software WD to validate conformance of UD standard was approved at $113^{th}$ MPEG meeting. In this paper, we developed a demo program for visual communication according to guideline defined in reference software WD to validate the reference software as well as UD standard.

• The Journal of the Korea Contents Association
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• v.2 no.3
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• pp.105-112
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• 2002

MPEG-4 is an international standard for interactive multimedia data that is used for next generation audio-visual service. It presents an two types of storage formal such as XMT (eXtensible MPEG-4 Textual fount) and MP4 file format D store the interactive multimedia contents. The XMT, a textual format, has advantage of readability and it can be used in many applications since designed based on the XML In this paper, we present the way how to author the MPEG-4 contents using XMT.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2003.11a
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• pp.223-226
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• 2003

최근, 컴퓨터 환경의 발달로 각 분야에서 AV(Audio-Visual) 콘텐츠의 사용량이 기하급수적으로 증가되었다 또한 컴퓨터, 방송 및 네트워크의 융합으로 이 전 보다 다양한 종류의 어플리케이션에서 다양한 형태로 AV 콘텐츠가 사용되고 있다 이에 따라, 이런 다양한 형태의 AV콘텐츠를 표현하는 방법 및 검색하여 사용하는 방법에 대한 많은 연구들이 이루어지고 있다 이런 연구들의 한 형태로 본 논문에서는 AV 콘텐츠를 표현하는 방법으로 MPEG-4 콘텐츠를 XML에 기반 하여 표현한 XMT(eXtensible MPEG-4 Textual fomat)와 AV 콘텐츠를 검색하는 방법으로 MPEG-7 표준을 사용하여 객체기반 MPEG-4의 콘텐츠 검객 시스템을 제안하였다 다양한 포맷의 미디어 데이터 및 그래픽 객체들을 각각의 하나의 객체로 간주하여 AV콘텐츠를 구성하는 MPEG-4 시스템을 XML을 기반으로 표현한 XMT 포맷으로는 MPEG-4 콘텐츠를 구성하는 미디어 데이터를 바탕으로 검색하는데 한계가 있다. 따라서 미디어 데이터 검색을 위한 메타데이 터의 표준으로 사용되고 있는 MPEG-7 을 사용하여 객체 기반 MPEG-4 콘텐츠 검색이 효과적으로 이루어질 수 있도록 확장된 XMT 포맷을 제안하고, 이를 사용하는 시험 시스템을 구성하였다. 이렇게 함으로써 MPEG-4로 표현된 객체 기반 AV 콘텐츠 검색 시 MPEG-7메타데이터를 사용하여 보다 사용자가 원하는 콘텐츠를 효율적으로 검색하여 제공할 수 있을 것으로 사려된다