RESEARCH PROFILE: VIDEO TECHNOLOGIES FOR NETWORKED MULTIMEDIA APPLICATIONS
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1 RESEARCH PROFILE: VIDEO TECHNOLOGIES FOR NETWORKED MULTIMEDIA APPLICATIONS Chia-Wen Lin ( 林 嘉 文 ) cwlin@cs.ccu.edu.tw Tel: (05) ext Networked Video Lab Dept. CSIE National Chung Cheng University
2 Research Focus: Networked Video Integration and Joint-optimization Client-Server Peer-Peer Disk Array Network Server Network User
3 Research Group Profile Group advisor: Chia-Wen Lin ( 林 嘉 文 ) Ph.D. E.E. National Tsing Hua University (Jan. 2000, 清 華 大 學 ) 8-year experience in CCL/ITRI (Section Manager) joined CCU in August 2000 Expertise: image/video processing, communication systems design Group members: 10 M.S. students Lab location: Lab 308 Lab equipment: video cameras + video capture cards computers laser printers, scanner, CD-R writer, ZIP driver, etc.
4 Technologies for Network Multimedia Delivery ive Content License Server Download & Play Streaming Live Feed n-demand Content UNICAST, MULTICAST tored ontent Media Encoder Media Services Server Streaming from a Media Server (or Web Server) Media Player PC, Hand-held, STB
5 Our Research Activities Objectives: Develop new technologies for low-cost high-quality ubiquitous networked multimedia applications Video phone and conference systems Delivery of video over networks / Video streaming Wireless video Video surveillance systems Video retrieval and other multimedia applications
6 Multipoint Video Conference System H Way 4 videoconference Coded video streams MCU Video bridge
7 Virtual Meeting Examples
8 MPEG-4 4 Video Streaming Applications: video/movie on demand, distance learning, video surveillance, video mail, etc. Supports: forward, backward, pause, stop, step-play, play, rewind, fast forward/backward, random access Low-complexity fast forward/backward, random access Minimize network traffic and decoding cost using intelligent bit- stream switching End-to to-end video quality guaranteed over Internet and access networks Sponsors: 國 科 會 ( ) ) 工 研 院 電 通 所 ( ) )
9 Demo: Streaming Video Player Published in IEEE Trans. CSVT (Mar 2001)
10 Streaming Video Player
11 Future Directions in Streaming Video Enhanced features Fast browsing/summarization Automatic generation of table of content Video object hyperlink Heterogeneous Multicasting Proxy Caching Performance Improvement on Video Streaming Codec
12 Video Object Hyperlink
13 Streaming Video with VCR Control & Table of Content
14 Transcoding for Universal Multimedia Access
15 Transcoding for Universal Multimedia Access A Coded digital video bit-stream Transcoder B Coded digital video bit-stream Bit-rate adaptation Temporal/spatial resolution conversion Standard conversion Video multicast over heterogeneous networks Watermarking/logo insertion Error resilience Multipoint videoconferencing
16 Video Transcoding Pixel-domain transcoding Coded-domain domain transcoding JPEG MPEG4 Input H.263 H.263 Output MPEG2 JPEG2000 Output can also be in the same standard as the input but has different bit-rates
17 Application Example: Home Gateway Home Network Systems supporting multimedia applications Protocol translation Media streaming and transcoding Proxy server Security White / Small Appliances PC Consumer Electronics Access Network Services Services Gateway Gateway Home Networks Home Networks TV Energy Meter Sensors Security Phone / WebPad
18 Video Surveillance System over Internet Cameras Cameras Cable MTA Terminal Cable MTA Terminal Storage Server Internet Internet Router Headend & security sever Remote Users Internet streaming player Residential Terminal Central Server Expected sponsor: 國 科 會 ( ) ) Remote Clients
19 Finished Work: Real-Time Live Video Transport server client Video capture card storage H.263 Encoder Network H.263 Decoder Controller
20 Wireless Error Resilience Coding Real time two-way way wireless video communications constrained by fading narrowband wireless channel 2G & 3G wireless systems Need error mitigation scheme FEC ARQ Base Station internet
21 Demo: Wireless Video (32Kbits/s) TMN8 Proposed Miss America sequence : PSNR improvement ~ 4.5 db
22 Demo: Wireless Video (32Kbits/s) TMN8 Proposed Carphone sequence : PSNR improvement ~ 3 db
23 Future 3-Year 3 Research Focuses Multimedia transport over the Internet video streaming, transcoding, error resilience techniques guaranteed QOS (quality of service) for multimedia services Develop systems for new practical applications Personal Video Editing/Management Compressed domain video editing and processing Video browsing/summarization Video object extraction Video structure analysis (table of contents) Video database retrieval
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