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Introduction about MPEG-1,2,4,7,21

Introduction about MPEG-1,2,4,7,21

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  • 03/21/12
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  • Spring 2002 Worldwide FAE Meeting Presented by: [Insert name(s)] [Insert Title of Presentation] 22 – 25 April 2002 Today, many elements exist to build an infrastructure for the delivery and consumption of multimedia content. There is, however, no 'big picture' to describe how these elements, either in existence or under development, relate to each other. The aim for MPEG-21 is to describe how these various elements fit together. Where gaps exist, MPEG-21 will recommend which new standards are required. ISO/IEC JTC 1/SC 29/WG 11 (MPEG) will then develop new standards as appropriate while other relevant standards may be developed by other bodies. These specifications will be integrated into the multimedia framework through collaboration between MPEG and these bodies. The result is an open framework for multimedia delivery and consumption, with both the content creator and content consumer as focal points. This open framework provides content creators and service providers with equal opportunities in the MPEG-21 enabled open market. This will also be to the benefit of the content consumer providing them access to a large variety of content in an interoperable manner. The vision for MPEG-21 is to define a multimedia framework to enable transparent and augmented use of multimedia resources across a wide range of networks and devices used by different communities.

Mpeg 7-21 Presentation Transcript

  • 1. MPEG-7Multimedia Content Description Interface Presented By: Mumtaz Khan
  • 2. Introductionƒ MPEG stand for Moving Picture Experts Groupƒ working group of ISO/IEC in charge of the development of standards for coded representation of digital audio and video and related data.ƒ More and more digital audio - visual information exists and increasing.ƒ Increasing Internet popularity How fast and easy can desirable information be made available?ƒ More audio-visual information processing systems emergedƒ The major MPEG standards include the following ‚ MPEG-1 ,MPEG-2 , MPEG-4 , MPEG-7 , MPEG-21
  • 3. MPEG-1(11/1992)ƒ standard for lossy compression of video and audioƒ Standardizes the storage and retrieval of moving pictures and audio storage media forms the basis for Video Cd and MP3 formatsƒ provide a video resolution of 352-by-240 at 30 frames per second (fps)ƒ This produces video quality slightly below the quality of conventional VCR videos.ƒ It viable for digital audio and TV broadcasting as well as the creation of video CDsƒ Today various products and applications use the MPEG-1 standard especially the audio format, the most popular is MP3.
  • 4. MPEG-1 file Extensionƒ The following are extension of MPEG-1 ‚ .mpg , .mpeg , .mp1 , .mp2 , .mp3 , m1v, .m1a , .mpa , mpvƒ Extended Form ‚ Jpeg,H.261
  • 5. MPEG-2(11/1994)ƒ MPEG-2 is widely used as the format of digital television signals that are broadcast by terrestrial, cable, and direct broadcast satellite TV systems.ƒ It also specifies the format of movies and other programs that are distributed on DVD and similar discs. As such, TV stations, TV receivers, DVD players, and other equipment are often designed to this standard.ƒ It provide resolutions of 720x480 and 1280x720 at 60 fps.ƒ MPEG1 is used for VCD while MPEG2 is used for DVD.
  • 6. MPEG-4 (V1-09-1998 v2-11-1999)ƒ MPEG-4 was standardized in October 1998 in the ISO/IEC document 14496ƒ The standard for multimedia for the fixed and mobile webƒ It based on MPEG-1 and MPEG-2 and Apple QuickTime technology.ƒ Wavelet-based MPEG-4 files are smaller than JPEG or QuickTime files,ƒ They are designed to transmit video and images over a narrower bandwidth and can mix video with text, graphics and 2-D and 3-D animation layers.
  • 7. MPEG-4 Standardized Methodƒ Audio-visual coding at very low bit ratesƒ Representing audio-visual objectsƒ Describing audio-visual objects in a sceneƒ Multiplexing and synchronizing the information associated with the objectsƒ Interacting with the audio-visual scene that is received by the end user
  • 8. MPEG-4 Aims and Featuresƒ Interoperability of products from different vendorsƒ Authors to have greater re-usability and flexibility with multimedia content producedƒ Improvement in the management of Intellectual Property Rightsƒ Transparent information for network service providersƒ Greater interactivity for end users. Users and content authors can manipulate rich media content (both natural and synthetic). The limits of interactivity are set by the authorƒ Users can have the ability to:  Change their viewing or listening point in the scene, e.g. by navigation through a scene  Drag objects in the scene to a different position
  • 9. Cont… Trigger a range of events by clicking on a specific object, e.g. starting or stopping a video stream Select a language (if the option is provided by the author) Scalability Advanced compression that provides higher capacity on CDs and DVDs and also greater bandwidth (therefore more space for digital channels).
  • 10. Main parts of MPEG-4ƒ System ‚ Scene description stream, object Description stream, visual stream, Audio stream, multiplexing, synchronization ‚ MPEG-4/BiFS • A method of encoding a scene description in a binary form • Based on VRML97,which uses hierarchies and nodes, also used for Web • Allow user to change their view point in a scene or to interact with media objects ‚ Profile and Levels • Profile is a subset of the MPEG-4 system, Visual or Audio tool set and is used for specific Applications • MPEG-4 Tool set include ,Visual Profile ,Natural Profile , Synthetic and Natural, Audio Profile , Graphic Profile, Scene Graph Profile.ƒ Visual ‚ Coded representation of natural and synthetic visual objects
  • 11. Cont…ƒ Audio ‚ Deals with the representation of audio objectsƒ Conformance Testing ‚ Conformance conditions for bit streams and devicesƒ Reference Software ‚ Normative and non-normative tools to validate the standardƒ Delivery Multimedia Integrated Framework(DMIF) ‚ MPEG-4 data is authored once and delivered anywhere ‚ A set of interfaces for accessing multimedia content
  • 12. Encoder,Decoder,Codecs,Players of MPEG-4ƒ ENCODERS ‚ DICas, Studio Encode, WebCast,Paketvideo etcƒ DECODERS ‚ EM8610 , EM8611 : For HDTV Decoder ‚ RealMagic :used with adobe premiere DV Editionƒ Codecs ‚ DivX and XviD etcƒ PLAYERS ‚ Mpegable X4 Live, Mpegable SDK 1.4,Mpegable Player, Nexplayer for PC and PDA ,WebCine , Osmose etc.
  • 13. MPEG-7(08-2001)„ MPEG-7 “ Multimedia content description interface”.„ Provide tools for describing multimedia content„ MPEG-1, -2, -4: make content available; MPEG-7: makes content accessible, retrievable, filterable, manageable (via device / computer).„ Goal: audio-visual material as searchable as text.
  • 14. MPEG-7 Tools„ Descriptor(Ds) ƒ Describe the syntax and semantics of audio, video and multimedia contents„ Description Schemes(Dss) ƒ Describe High level AV features e.g. describing region, segments,objects,events„ Description Definition Language(DDL) ƒ Allow new Descriptor and Description schemes to be defined and existing DSs to be modified.„ DDL consist ƒ XML Schema structural language components ƒ XML schema Data type language components ƒ MPEG-7 Specific extension
  • 15. MPEG-7 Extension used to describe„ Content„ Form„ Condition for accessing the material ƒ Links to registry ƒ Intellectual property rights ƒ Price„ Classification ƒ Parental rating ƒ Content classification(into pre-defined categories)„ Storage features on the content ƒ Storage format ƒ Encoding„ Creation –director , title, short feature moive
  • 16. MPEG-7 Extension used to describe„ Structural information(spatial ,teporal or spatio-temporal components) ƒ Scene cuts ƒ Segmentation in region ƒ Region motion tracking„ Low level features of content ƒ Colors ,textures, sound timbres, Melody description„ Conceptual information of the reality captured by the content ƒ Objects ƒ Events ƒ Interaction among objects„ User interaction (with the contents) ƒ User preferences ƒ Usage history
  • 17. MPEG-7 TerminologyData, AV Content Description Definition 1..* ItemFeature, Language (DDL) defines 1..*Descriptor (D), 0..* DescriptionDescriptor value, Scheme *Description Scheme (DS), 1..* 1..*Description, describes signifies Descriptor Feature Data *..1 1..*Coded Description and ToDescription Definition Language (DDL) Human or System
  • 18. MPEG-7: Major Parts„ Systems (ISO / IEC 15938 - 1)„ Description Definition Language (ISO / IEC 15938 - 2)„ Visual (ISO / IEC 15938 - 3)„ Audio (ISO / IEC 15938 - 4)„ Multimedia Description Schemes (ISO / IEC 15938 - 5)„ Reference Software
  • 19. Objective of MPEG-7 „ Standardize content-based description for various types of audiovisual information ƒ Enable fast and efficient content searching, filtering and identification ƒ Describe several aspects of the content (low-level features, structure, semantic, models, collections, creation, etc.) ƒ Address a large range of applications (⇒ user preferences) s Types of audiovisual information: x Audio, speech x Moving video, still pictures, graphics, 3D models x Information on how objects are combined in scenes
  • 20. Example of application areas„ Storage and retrieval of audiovisual databases (image, film, radio archives)„ Broadcast media selection (radio, TV programs)„ Surveillance(traffic control, surface transportation, production chains)„ E-commerce and Tele-shopping (searching for clothes / patterns)„ Remote sensing(cartography, ecology, natural resources management)„ Entertainment (searching for a game, for a karaoke)„ Cultural services (museums, art galleries)„ Journalism (searching for events, persons)„ Personalized news service on Internet (push media filtering)„ Intelligent multimedia presentations„ Educational applications„ Bio-medical applications
  • 21. Example of queries„ Text: ƒ Find AV material with the concepts described by the text„ Semantic: ƒ Find AV material corresponding to the specified semantic„ Image: ƒ Find an image with a similar characteristic (global or local)„ Music: ƒ Play a few notes and search for corresponding musical pieces„ Motion: ƒ Find video with specific object motion trajectories
  • 22. Relation content / description „ Description may be separated from the content AV material Description AV material AV material AV material s Description may be multiplexed with the content AV Desc AV Desc AV Desc
  • 23. Type of description„ Information about the content: recording date & conditions, title, author, copyright, coding format, classification, etc.„ Information present in the content: Combination of low level and high level descriptors ƒ High level description: x Low level description ‚ Efficient and powerful 3 Generic and flexible 3 Intelligent / efficient search engine ‚ Lack of flexibility Indexing Search Feature extrac Retrieval High level Low level Recognition Recognition No restriction Efficiency process process on the search
  • 24. Why do we need a standard ?Having a standard will ease the task of fast and efficient identification of contentthat is of interest to the user by s allowing the same described s allowing the same search engine content to be accessed by more and filters to identify described search engines and filters content from more sources
  • 25. Scope of MPEG-7 Description Description Description generation consumption Research and Scope of MPEG-7 future competition„ The description generation ƒ Feature extraction, Indexing process, Annotation &Authoring tools,...)„ consumption ƒ Search engine, Filtering tool, Retrieval process, Browsing device, ...)„ are non normative parts of MPEG-7„ The goal is to define the minimum that enables interoperability
  • 26. MPEG-21 (11-2001)„ Vision ƒ To define a multimedia framework to enable transparent use of multimedia resources across a wide range of networks and devices used by different communities„ Purpose ƒ Enable electronic creation, delivery, trade of digital multimedia content„ Goals ƒ Provide access to information and services from almost anywhere at anytime with ubiquitous terminals and networks ƒ Identify, describe, manage, and protect multimedia content to support delivery chain of content creation, production, delivery, and consumption