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MPEG-7 Overview - part 2

MPEG-7 Overview - part 2. Review. Descriptor (D) - 對內容的特徵作定義 。 - 通常用以描述 low-level features 。 Description Scheme (DS) - 通常用以描述 high-level features 。 - DS 和 D 的區別是： D 僅包含基本的資料類型，而 DS 可 同時包含 D 與 DS 。. DDL. DS. DS. DS. D. D. D. D. D. D. Review (contd.).

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MPEG-7 Overview - part 2

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  1. MPEG-7 Overview - part 2

  2. Review • Descriptor (D) -對內容的特徵作定義。 -通常用以描述low-level features 。 • Description Scheme (DS) - 通常用以描述 high-level features 。 - DS和D的區別是：D僅包含基本的資料類型，而DS可 同時包含D與 DS。

  3. DDL DS DS DS D D D D D D Review (contd.) • D、DS與DDL之關係圖如下 :

  4. DDL (Description Definition Language) • The DDL defines the syntactic rules to express and combine DSs and Ds. • The DDL is not a modeling language but a schema language to represent the results of modeling audiovisual data, i.e. DSs and Ds. • In March 2000, MPEG was decided to adopt XML Schema Language as the MPEG-7 DDL.

  5. DDL (contd.) • However, XML Schema language has not been designed specifically for AV content, certain extensions have been necessary. ․Array and matrix datatypes ․Built-in primitive time datatypes

  6. BiM • XML has not been designed to deal ideally in a real-time, constrained and streamed environment. • To overcome it, MPEG-7 Systems defines a generic framework to facilitate the carriage and processing of MPEG-7 descriptions: BiM (Binary Format for MPEG-7).

  7. BiM (contd.) • The features of BiM are : ․BiM binary format is not dedicated to any specific XML language. ․BiM is a schema oriented encoding scheme. ․BiM is a pre-parsed format ․BiM allows a parameterized transmission of XML document, like depicted below : Fig. Different streaming strategies of the same XML file

  8. MPEG-7 Terminal • The entity that makes use of the coded representations of the multimedia content description is referred to as the “terminal”. • The terminal has three main architectural layers : ․application layer ․system layer ․delivery layer

  9. MPEG-7 Terminal (contd.) • An MPEG-7 terminal consumes description streams and outputs a representation of the description called the current description tree. • Description streams consist of Access Units (AUs). ․textual description stream ․binary description stream

  10. MPEG-7 Terminal (contd.) • An AU is composed of any number of Fragment Update (FU) Units, each of which is extracted in sequence by the fragment update component extractor. • Each FU unit consists of : ․a FU command ․a FU context ․a FU payload

  11. MPEG-7 Terminal (contd.)

  12. Reference Software: the eXperimentation Model • The XM software is the frame work for the for all the reference code of the MPEG-7 standard. • The XM software has only a command line interface, which does not allow any interaction during run-time. • The modules of the XM software are designed in a way, that all modules are using specified interfaces.

  13. Reference Software: the eXperimentation Model (contd.) • Within the XM software framework, applications are related to one particular descriptor or description scheme. ․Server (or extraction) applications ․Client applications

  14. Application types in the XM software • Extraction from Media

  15. Application types in the XM software(contd.) • Search & Retrieval Application

  16. Application types in the XM software(contd.) • Media Transcoding Application

  17. Application types in the XM software(contd.) • Description Filtering Application

  18. The MPEG-7 key application model • Applications, which are implemented in the XM software are also called key applications. • The inputs and outputs of key applications are:

  19. Key applications vs. real world applications • In general, combining the key applications will form complex applications.

  20. MPEG-7 Conformance Testing • MPEG-7 Conformance Testing includes the guidelines and procedures for testing conformance of MPEG-7 implementations. • There are two kinds of conformance testing : ․conformance testing for descriptions ․conformance testing for terminals

  21. MPEG-7 Conformance Testing(contd.) • The objective of the conformance testing of descriptions is to check the syntactic compliance with ISO/IEC IEC 15938 parts 1 – 5.

  22. MPEG-7 Conformance Testing(contd.) • The conformance testing for terminal involves the comparison of the result of processing a description using a reference terminal against the result using the test terminal.

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