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Multimedia Communications Introduction

Multimedia Communications Introduction. ECE 591 Pro. Honggang Wang. Multimedia. What is multimedia Text, speech, music, audio, image, graphics, video, and many more... Multimedia Research Compression/Coding (e.g., MPEG, JPEG) Networking: Streaming, QoS , etc..

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Multimedia Communications Introduction

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  1. Multimedia CommunicationsIntroduction ECE 591 Pro. Honggang Wang

  2. Multimedia • What is multimedia • Text, speech, music, audio, image, graphics, video, and many more... • Multimedia Research • Compression/Coding (e.g., MPEG, JPEG) • Networking: Streaming, QoS, etc.. • Implementation: architectures, low power • Databases: Retrieval and Indexing • Human-Machine interface

  3. Multimedia Communications • Coding • Compression algorithms for audio, images, and video • Networking • Transmission of multimedia over networks • System • Integrating audio, video, and other components

  4. Current Multimedia and Communication Technologies • Well-developed multimedia standards • Source compression has matured: MPEG-1 Layer 3, JPEG-2000, MPEG-4 • Mature standards have created many devices and applications: MP3,DVD, Streaming video • Rapid development of communication technologies • Broadband: DSL, Cable Modems, Satellite • HDTV will convey data and media • Wireless for any-where any-time connections: 3G, 802.11A/B • Advances in networking technologies • Promise of ubiquitous, heterogeneous networks.

  5. Coding • Image and Video

  6. Why Compression • Color Images of 600*800 – 600*800*24bits/pixel=1.44M bytes – After JPEG compression Only 89kBytes, Compression ratio 16:1 • Movie • 720x480 per frame, 30 frames/sec, 24 bits/pixel ~ 243M bits/sec • DVD ~ about 5M bits/sec • Compression ratio ~ 48:1

  7. System and Networking Issues • Big Picture

  8. Issues in Networked Multimedia • Real time constraints: delay, delay jitter • Bandwidth requirement • Quality of Services: Delay, delay jitter, packet loss, bit-error-rate… • Error Robustness: Error Resilience, Error concealment • Cost • …

  9. Topics to be Covered... • JPEG (Joint Photographic Experts Group ) • H.261, H.263, H.263 Version 2 • MPEG (Moving Picture Experts Group)-1,2,4,7 • MPEG Audio • Networking Issues • Error control in video communications • Multimedia over IP • RTP, RTCP, RTSP, RSVP • Audio-visual integration, multimedia processing, organization, storage, retrieval • New approaches to service deployment and ensuring consistent Quality of Service • Security issues in multimedia communication • Multi-camera networks

  10. A Simple Study (Try) • Download Lena file http://en.wikipedia.org/wiki/File:Lenna.png • A=imread(‘Lenna.png'); imshow(A)

  11. Any Questions?

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