Like MPEG - 2, MPEG - 4 defines many Profiles and Levels for various applications. The standardization of profiles and levels in MPEG - 4 serves two main purposes: ensuring inter operability between implementations and allowing testing of conformance to the standard. MPEG - 4 not only specified Visual profiles and Audio profiles but also Graphics profiles, Scene description profiles, and one Object descriptor profile in its Systems part. We will briefly describe the Visual profiles in this section.
Since MPEG - 4 scenes often contain more than one video object, the concept of object type is introduced, to define the tools needed to create video objects and the ways they can be combined in a scene.
Table Tools for MPEG - 4 natural visual object types
The above table shows the various tools applicable to the MPEG - 4 natural visual object types. For example, for object type "core", only five tools are used. Tools such as "gray - level shape coding", "sprite", "interlace", and so on, will not be used.
Table MPEG - 4 Natural Visual Object Types and Profiles
The above table shows these object types in MPEG - 4 visual profiles. Main profile, for example, supports only object types "simple", "core", "main", and "scalable still texture".
Table MPEG - 4 Levels in Simple, Core, and Main Visual Profiles
The above table lists the levels supported by the three most commonly used Visual profiles: simple, core, and main. For example, although CIF (352 x 288) is supported in four different levels (levels 2 and 3 in simple profile, level 2 in Core profile, and level 1 in Main profile), very different bitrates and maximum numbers of objects are specified. Hence, different qualities for CIF videos would be expected.
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Introduction To Multimedia
Multimedia Authoring And Tools
Graphics And Image Data Representations
Colour In Image And Video
Fundamental Concepts In Video
Basics Of Digital Audio
Lossless Compression Algorithm
Lossy Compression Algorithms
Image Compression Standards
Basic Video Compression Techniques
Mpeg Video Coding I – Mpeg 1 And 2
Mpeg Video Coding Ii- Mpeg-4, 7, And Beyon
Basic Audio Compression Techniques
Mpeg Audio Compression
Computer And Multimedia Networks
Multimedia Network Communications And Applications
Content-based Retrieval In Digital Libraries
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