23-02-2013, 10:33 AM
Multimedia Content Description Interface
Multimedia Content.pptx (Size: 1.11 MB / Downloads: 29)
Introduction
In September 2001, Moving Picture Experts Group (MPEG) specified an international standard called Multimedia Content Description Interface, or MPEG-7.
MPEG-7 is a standardized description, based on XML
Schema, of various types of AV content.
Material (e.g., still pictures, graphics, audio, video) with associated MPEG-7 data can be efficiently indexed and searched for.
Scope of MPEG-7
The description generation (feature extraction, indexing) is not a normative part of the standard
The description consumption (search engine, retrieval process) is also not a normative part of the standard.
Just the description is normative
Standardizes the minimum needed to ensure interoperability
Multimedia Description Schemes- MDS
MPEG-7 Multimedia Description Schemes (DSs) are metadata structures for describing and annotating audio-visual (AV) content.
The DSs provide a standardized way of describing in XML the important concepts related to AV content description and content management in order to facilitate searching, indexing, filtering, and access.
The DSs are defined using the MPEG-7 Description Definition Language (DDL), which is based on the XML Schema Language, and are instantiated as documents or streams.
DDL: XML & format
XML was created to structure, store, and transport information.
• It is just plain text. Software that can handle plain text can also
handle XML.
• It is just pure information wrapped in tags. Someone must write a
piece of software to send, receive or display it.
• XML-aware applications can handle the XML tags specially. The
functional meaning of the tags depends on the nature of the
application.
Binary Format- BiM
BiM is designed for transmission and storage
BiM encoders and decoders can deal with any XML language.
BiM is a schema oriented encoding scheme
The binary format is deduced from the schema definition
There is no need to define coding tables or a specific encoding mechanism