Download Interactive Distributed Multimedia Systems and by Gerard J. M. Smit (auth.) PDF

By Gerard J. M. Smit (auth.)

The first foreign Workshop on Interactive allotted Multimedia platforms and Telecommunication prone (IDMS) was once geared up by means of Prof. ok. Rothermel and Prof. W. Effelsberg, and happened in Stuttgart in 1992. It had the shape of a countrywide discussion board for dialogue on multimedia matters regarding communications. The succeeding occasion was once "attached" as a workshop to the German machine technology convention (GI Jahrestagung) in 1994 in Hamburg, equipped via Prof. W. Lamersdorf. The chairs of the 3rd IDMS, E. Moeller and B. Butscher, more suitable the development to turn into a really winning foreign assembly in Berlin in March 1996. This brief evaluate at the first 3 IDMS occasions is taken from the preface of the IDMS’97 lawsuits (published via Springer as Lecture Notes in machine technology, quantity 1309), written via Ralf Steinmetz and Lars Wolf. either, Ralf Steinmetz as basic chair and Lars Wolf as application chair of IDMS’97, equipped a superb foreign IDMS in Darmstadt. for the reason that 1998, IDMS has moved from Germany to different eu towns to stress the foreign personality it had received within the earlier years. IDMS’98 used to be equipped in Oslo by way of Vera Goebel and Thomas Plagemann at UniK – heart for know-how at Kjeller, college of Oslo. Michel Diaz, Phillipe Owezarski, and Patrick Sénac effectively geared up the 6th IDMS occasion, back open air Germany. IDMS'99 happened in Toulouse at ENSICA. IDMS 2000 persevered the culture and used to be hosted in Enschede, the Netherlands.

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Extra info for Interactive Distributed Multimedia Systems and Telecommunication Services: 7th International Workshop, IDMS 2000 Enschede, The Netherlands, October 17–20, 2000 Proceedings

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Media positioning After a loss of unknown length, the data that comes after the loss must be processed. However, as the amount of lost data is unknown, it is not possible to know how much space in the image the lost data corresponds to. This makes it impossible to map the data received after a loss to a correct position in the image. The JPEG standard provides optional resynchronization capability. This capability is based on the insertion of restart markers into the data stream. Eight unique restart markers are specified by the JPEG standard.

This is a disadvantage compared to the maximum spreading method which will not interleave so that neighbor blocks are lost for one data loss. 1 If an image contains areas which differ greatly in the amount of encoded data produced, this will cause imbalance in the spreading. 22 J. Garcia and A. Brunstrom Fig. 7. Random block interleaved Fig. 8. Random block concealed Windowed random interleaving. In order to improve the random block interleaving we have devised a window-based random interleaving which is capable of alleviating the neighbor block loss problem for single data losses.

If a given block after interleaving has any of its neighboring blocks within P MCUs, then a data loss could cause a neighbor block loss. In order to avoid this, a test is performed in step 4 to see if the block to be interleaved has its above or left neighbor located within P MCUs from the MCU to which O[M ] belongs. This could cause a loss of size L to include a neighboring block, which is undesirable. If the block has a neighbor within the window, a new counter is initialized N = N + 1 and steps 3 and 4 above are repeated with N and a new test is performed.

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