• Title/Summary/Keyword: MPEG4

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Conformance Test for MPEG-4 Shape Decoders (MPEG-4 Shape Decoder의 적합성 검사)

  • 황혜전;박인수;박수현;이병욱
    • 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.

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Video object segmentation and frame preprocessing for real-time and high compression MPEG-4 encoding (실시간 고압축 MPEG-4 부호화를 위한 비디오 객체 분할과 프레임 전처리)

  • 김준기;이호석
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.2C
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    • pp.147-161
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    • 2003
  • Video object segmentation is one of the core technologies for content-based real-time MPEG-4 encoding system. For real-time requirement, the segmentation algorithm should be fast and accurate but almost all existing algorithms are computationally intensive and not suitable for real-time applications. The MPEG-4 VM(Verification Model) has provided basic algorithms for MPEG-4 encoding but it has many limitations in practical software development, real-time camera input system and compression efficiency. In this paper, we implemented the preprocessing system for real-time camera input and VOP extraction for content-based video coding and also implemented motion detection to achieve the 180 : 1 compression rate for real-time and high compression MPEG-4 encoding.

An MPEG-4 Contents Authoring System based on Temporal Constraints Model supporting User Interaction (사용자 상호작용 지원 시간 제약 모델 기반 MPEG-4 컨텐츠 저작 시스템)

  • 김희선;김상욱
    • Journal of KIISE:Computing Practices and Letters
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    • v.9 no.2
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    • pp.182-190
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    • 2003
  • For temporal relations of interactive media such as MPEG-4, it is necessary for a temporal model that can update dynamically presentation time and temporal relations among objects by user events occurring during playback. Also, 811hough the temporal attributes are changed by user events, the validity of scene must be maintained. In this paper, we propose a temporal model that supports user interaction and developed an MPES-4 contents authoring system applying this model. We define the temporal relations of MPEG-4 that tan be authored and user interactions that can change the temporal properties. This authoring system defines the constraints on temporal relations and events and can generate the scene without error by checking the constraints. Also it provides the authoring environment to author visual]y temporal relations and events in MPEG-4 scene and generates the MPEG-4 stream by encoding the authored scene.

IPMP information editing system of MPEG-4 authorizing tool base for digital contents management and protection (디지털 콘텐츠 보호 및 관리를 위한 MPEG-4 저작도구 기반의 IPMP 정보 편집 시스템)

  • 박철민;최종근;김광용;홍진우;정회경
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2004.05b
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    • pp.225-228
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    • 2004
  • Digital contents is used already in near place with us. Contents of MPEG-4 standard is used to process multimedia data in field of communication, computer, broadcasting mobile etc. However, absence of copyright management and protection system and interoperability problem of right system between each corporation happened. Because MPEG establish IPMP(Intellectual Property Management and Protection) system standard in agreement with MPEG-4 system standard, proposed cooperation method to manage and protect copyright. Accordingly, in this paper, put in copyright of authorized contents management and protection extension system implementation adding MPEG-4 IPMP system like plug-in into existing MPEG-4 authorizing tool. Therefore, author edits IPMP information to protect contents or object, and process the information in system and authorize MPEG-4 digital contents that have management and protection sign according to IPMP standard. This system designed and implemented to divided into IPMP information save processor, IPMP information creation processor, media IPPM processor, XMT-A to MP4 converter IPMP extension.

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Design and implementation of a media processor for mobile multimedia broadcasting (이동멀티미디어 방송을 위한 미디어 처리기 설계 및 구현)

  • 안상우;이용주;최진수;김진웅
    • Journal of Broadcast Engineering
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    • v.8 no.3
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    • pp.259-267
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    • 2003
  • In this paper, we propose a media processor to provide interactive services in mobile multimedia broadcasting environments. The proposed system Is designed to support various functionalities, such as generation of MPEG-4 IOD (Initial Object Descriptor)/OD(Object Descriptor)/BIFS (Binary Format for Scene) data, encapsulation of MPEG-4 AVC (Advanced Video Coding)/BSAC (Bit Sliced Arithmetic Coding) stream and generated IOD/OD/BIFS data into SL (Sync Layer) packet, packetization of SL packet into TS (Transport Stream) packet and multiplexing. The proposed media processor can provide MPEG-4 based interactive services for users.

Real-Time MPEG-4 Scene Update by User Interaction (사용자 상호작용에 의한 실시간 MPEG-4 장면 갱신)

  • 김희선;차경애;김상욱
    • Proceedings of the Korean Information Science Society Conference
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    • 2000.04b
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    • pp.438-440
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    • 2000
  • MPEG-4 컨텐츠는 다양한 시청각 객체들로 구성되어 사용자 상호작용에 대한 정의를 포함하여 동적인 장면 변화를 지원한다. MPEG-4 규칙을 모르는 일반 사용자가 기존에 개발된 MPEG-4 저작 도구를 사용하여 사용자 상호작용과 장면 변화 정보를 생성하기 어렵다. 본 논문에서는 라우트와 커맨드 정보를 이용하여 사용자 상호작용에 대한 실시간 MPEG-4 장면 갱신을 지원하여 사용자에게 동적인 컨텐츠를 제공한다. 사용자 상호작용과 그에 대한 반응을 시각적으로 저작하면 MPEG-4에 정의된 라우트와 커맨드를 자동으로 생성하여 씬을 실시간에 변화시킨다. 재성되는 씬에 발생하는 사용자 상호작용에 따라서 실시간에 장면 그래프가 갱신되어 컨텐츠를 변화시킨다.

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Design and Implementation of the Interface between TS Demux and MPEG-4 System (TS Demux와 MPEG-4 시스템의 인터페이스 설계 및 구현)

  • 박주희;서주희;전종구
    • Proceedings of the Korea Multimedia Society Conference
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    • 2003.11b
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    • pp.998-1001
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    • 2003
  • DMB 단말 시스템에서는 Delivery Layer로 다중화 방식인 MPEG-2 TS 와 MPEG-4 System SL를 이용하도록 제안되었다. 본 논문에서는 DMB 단말 시스템에서 사용되는 MPEG 2 $\square$TS는 H/W로 구현하고 MPEG 4 System S/W로 구현하는데 있어서 효율적인 인터페이스를 제안한다.

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A Study for the MPEG-4 Library to operate in real-time on the DSP (DSP상에서 실시간 처리 가능한 MPEG-4 Library에 관한 연구)

  • Hong, Sung-Hwa;Jung, Suk-Yong
    • Journal of the Korea Convergence Society
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    • v.2 no.1
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    • pp.7-13
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    • 2011
  • Informations of multimedia centering in the images, are combined acoustic and letter, etc. Although the network advances and the capacity of the storage media extends, these huge informations will not be able to accommodate. From meaning which is like this, International standards for the compression and a multiplexing of image, acoustic and voice H261 where admits standard, JPEG, JBIG, MPEG-l, MPEG-2, MPEG-4 and H263, G series etc, are core techniques of multimedia. At initial step of the base technique which creates the base of like this multimedia service time, we developed the real-time MPEG-4 transmission systems to provides real-time MPEG-4 multimedia services. This system means becomes the base technique which hereafter is developed and is applied various system. This system Will be able to apply from a videoconference, a building protection system and a VOD video system to use the Internet. And, They, the image sensing, embedded linux, and MPEG4 software, will become sourceful technique to develop the different system.

The Design and Development of MPEG-4 Contents Authoring System (MPEG-4 컨텐츠 저작 시스템 설계 및 개발)

  • Cha, Kyung-Ae;Kim, Hee-Sun;Kim, Sang-Wook
    • Journal of KIISE:Computing Practices and Letters
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    • v.7 no.4
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    • pp.309-316
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    • 2001
  • MPEG-4 describes audiovisual scenes that are composed of several media objects, organized in a hierarchical fashion. And for end users, it brings higher levels of interaction with content, within the limits set by the author. These spatio-temporal arrangements of the objects in the scene are specified using a parametric methodology, BIFS(BInary Format for Scenes). This paper proposes MPEG-4 Contents Authoring System that provides visual configuration of an MPEG-4 scene and its event information. The developed MPEG-4 Contents Authoring System generates streaming MPEG-4 Contents, such as BIFS stream, OD(Object Descriptor) stream automatically.

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Fast Transcoding from H.264 to MPEG-4 (H.264에서 MPEG-4로 빠른 트랜스코딩)

  • 권혁균;이영렬
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.41 no.6
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    • pp.91-99
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    • 2004
  • This paper proposed two transcodiing methods, which maintain the same spatio-temporal resolution and reduce a spatial resolution, to convert a H.264 video bitstream into an MPEG-4 video bitstream. When the H.264 video bitstream is transformed into the MPEG-4 video bitstream, the conversions between H.264 block types and MPEG-4 block types are performed by minimizing distortion and the ${\times}4$ block-based motion vector mapping is performed. The proposed two transcoding methods run 4.14~5.1 times as fast as the cascaded transcoding methods in MPEG-4 encoder side, while the PSNR (peak-signal-to ratio) is slightly degrade with maximum 0.3dB.