1. On Interactive Browsing of Large Images Jin Li,Hong-Hui Sun IEEE TRANSACTION ON MULTIMEDIA, DECEMBER 2003

2. Outline Introduction Virtual Media Access Protocol Result Conclusion

3. Introduction How to deliver the image of high resolution more efficiently ? With ROI (region of interest), user interactive with server to specifiy interested region and resolution

4. Introduction a.Server do all the work Computationally intensive, limit the amount of users b.Store a master compressed bitstream Flashpix,more information, slow when switch from one resolution to another

5. Introduction New interactive image browsing system In a prioritized way Manages the delivered ROI bitstream Offer a modular bitstream Vmedia support access,cache,and management of compressed bitstream

6. Virtual Media Access Protocol Provide functionalities Flexible media access Cache of the delivered media segment Prioritized delivery Media segment packaging

7. Virtual Media Access Protocol Server Client Media Apps Vmedia APIs Network Service Cache JPEG 2000 File Vmedia Network Service

8. Virtual Media Access Protocol-Vmedia cache a).cache hit detection Check if a requested segment is in cache. b).cache memory allocation Allocation memory space for new media segment No cache memory left, throw out less used and less important

9. Virtual Media Access Protocol-Vmedia cache Media file …….. S1,1S1,2S1,3S1,4……….S1,32 SMU Sm,1Sm,2Sm,4……….Sm,32 Validity 4 Importance 1 Hit count 2 Lock 1 MU Sm,3

10. Virtual Media Access Protocol-Queues Pending Queue Issued by apps, not sent over the network Sending Queue Request sent, not received ROI change Apps send a clear function call to client Contact server to cancel all requests not processed by the server

11. Results

14. Conclusion Browsing the image through a region of interest(ROI) with spatial and resolution constraint Through Vmedia, bitstream of ROI is delivered in a prioritized fashion

15. Conclusion Vmedia caches and manages the delivered bitstream We can browse a large compressed image (26MB), even the network speed is slow (33.6kbps)