PowerPoint Presentation On MPEG 4

PPT On MPEG 4

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MPEG 4 Presentation Transcript:

1. OVERVIEW OF MPEG
MPEG-4 is an ISO/IEC standard developed by MPEG (Moving Picture Experts Group). These standards made interactive video on CD-ROM, DVD and Digital Television possible. MPEG-4 was finalized in October 1998 and became an International Standard in the first months of 1999.

2. Several extensions were added since and work on some specific work-items work is still in progress. MPEG-4 builds on the proven success of three fields: Digital television. Interactive graphics applications (synthetic content). Interactive multimedia.

3. Compression & MPEG4
Compression (or encoding): key to enabling both wireless/wired transmission and storage of digital video content. MPEG4: Offers extremely high image quality Compression in the rates of 70:1 to 200:1.

4. Identify useful part of the signal(entropy). Video compression basics— (a)Human sensitivity to noise. (b)Commanality between one picture and next. In a typical picture ,large objects results in low spatial frequency and vice versa.

5. TWO DIMENSINAL SPATIAL FREQUENCY ANALYSIS
Using Discrete Cosine Transform. DCT Converted Video in to Array of coefficients.

6. Coefficients represent amount of spatial frequency. Coefficients in the top left corner represents dc component. Moving down and right results in spatial frequency. Further compression.

7. VIDEO ENCODING
DCT and Weight coefficients. Zig Zag Scan ,Run Length Code & Buffer. Decoding.

8. The MPEG-4 standard provides a set of technologies to satisfy the needs of authors, service providers and end users alike. For authors, MPEG-4 enables the production of content that has far greater flexibility. For network service providers MPEG-4 offers transparent information.

9. The foregoing, however, excludes Quality of Service considerations, for which MPEG-4 provides a generic QoS descriptor for different MPEG-4 media. It also brings multimedia to new networks, including those employing relatively low bitrate, and mobile ones.

10. For more info. please refer our PPT. Thanks.