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MPEG-21 bitstream syntax description for scalable video codecs Chris Poppe Sam Lerouge Wesley De Neve Rik Van de Walle Davy De Schrijver Sravanthi Kolloju 2444637 Introduction Cell phones and PDA s are capable of running video files

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mpeg 21 bitstream syntax description for scalable video codecs

MPEG-21 bitstream syntax description for scalable video codecs

Chris Poppe

Sam Lerouge

Wesley De Neve

Rik Van de Walle

Davy De Schrijver

Sravanthi Kolloju

2444637

introduction
Introduction
  • Cell phones and PDA s are capable of running video files
  • But both of them have dissimilar characteristics in terms of memory processing power and bandwidth.
  • So for every device there is need of using different bitstream for video broadcast.
main idea
Main Idea
  • Multichannel Publication Environment.
  • MPEG-21 Bitstream Syntax Description language (BSDL).
  • Creates high-level XML description of the structure of the bitstream.
bitstream syntax description language bsdl
Bitstream Syntax description language(BSDL)
  • MPEG-21 is build around one central concept called
  • “Digital Item (DI)”
  • BSDL belongs Digital Item Adaptation (DIA)
  • DIA consists of several tools like
  • Bitstream Syntax Description (BSD)
  • Bitstream Schema
related work
Related Work
  • Another language used for multimedia representation is FLAVOR (Formal Language for Audio-Visual Object Representation.
  • FLAVOR code describes structure of a bit stream and this code can in turn be translated into C++ or Java.
  • FLAVOR which supports XML features is known as XFLAVOR.
  • MPEG video mark up language is a description language that has the same functionality of XFLAVOR .
scalable video coding
Scalable video coding

There are different types of video coding used for different applications

  • Fully scalable video coding MC-EZBC: This coding consists of all the information of original video stream.
  • Temporal scalability: Is used to achieve a video

with lower frame rate.

  • Spatial scalability : Is used to achieve a video with lower resolution.
  • SNR scalability : Is used to achieve lower bitrate
fully scalable video coding
Fully Scalable Video Coding
  • In this picture decomposition is done by dividing in to
  • low frequency frames and high frequency frames.
structure of a mc ezbc bitstream
Structure of a MC-EZBC bitstream
  • The header consists of general information about the bitstream.
  • The general bitstream consists of header and payload.
  • Payload contains sizes of GOPs following the actual GOPs structure.
bitstream to xml
Bitstream to XML
  • Based on the bitstream BS Schema is generated.
  • The corresponding XML code is created by making use of
  • BintoBsd and BSSchema.
  • <?xml version=“1.0”>
  • <Bitstream namespace>
  • +<header>
  • +<NUMBER_GOPs>
  • +<GOPSIZE>
  • +<GOP>
  • +<GOP>
  • .
  • .
  • </Bitstream>
adaptation of temporal scalability
Adaptation of Temporal Scalability
  • By using temporal scalability a video with a lower frame
  • rate is obtained.
  • The lower frame rate is obtained by eliminating eight
  • high frequency frames in fully scalable video coding.
  • H frames can be eliminated by removing the highest
  • content tag in each GOP tag.
slide11

SpatialScalability

  • A lower resolution video frame is obtained by using Spatial Scalability.
  • This is obtained by eliminating highest subbands of each substream.

SNR Scalability

  • A bitstream with a lower bit rate is generated with SNR
  • Scalability.
  • The encoding process in SNR scalability delivers a
  • compressed bit stream and also a file containing
  • information about the bit planes of different subbands.
conclusion
Conclusion
  • Coding format-independent adaptation frame work for binary media resources is discussed.
  • To evaluate the performance of the BSDL framework, bitstreams encoded by two different coding schemata were discussed.
  • Various scalability methods are achieved by adaptive XML.
references
References
  • Vetro, A., Christopoulos, C., Ebrahimi, T.: From the guest editors

– Universal multimedia access. IEEE Signal Process. Mag. 20(2),

16 (2003)

  • ISO/IEC 21000-7:2004: Information technology—multimedia

framework (MPEG-21)—Part 7: Digital Item Adaptation (2004)

  • Mukherjee, D., Wang, H., Said, A., Liu, S.: Format-Agnostic

adaptation using the MPEG-21 DIA framework. In: Proceedings

of SPIE Annual Meeting 2004: Signal and Image Processing and

Sensors. Denver, vol. 5558, pp. 351–362 (2004)

  • Devillers, S., Timmerer, C., Heuer, J., Hellwagner, H.: Bitstream

syntax description-based adaptation in streaming and constrained

environments. IEEE Trans. Multimedia 7(3), 463–470 (2005)

  • Burnett, I., Van de Walle, R., Hill, K., Bormans, J., Pereira, F.:

MPEG-21: Goals and achievements. IEEE Multimedia 10(4), 60–

70 (2003) Amielh,M., Deviller, S.: Bitstream Syntax Description Language:

  • Application of XML-schema tomultimedia content adaptation. In:

Proceedings of the 11th International WWW Conference. Honolulu,

Hawaii (2002)

  • Duckett, J., Ozu, N., Williams, K., Mohr, S., Cagle, K., Graffin,

O., Norton, F., Stokes-Rees, I., Tennison, J.: Professional XML

Schemas. Wrox Press Ltd., Birmingham, UK (2001)