Michael Merz, Konrad Froitzheim, Peter Schulthess, and Heiner Wolf, "Iterative transmission of media streams," in Proceedings of the conference on Multimedia '97. ACM, 1997, pp. 283--290.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....the video several times. The downscaled image is then coded on the lowest layer. Afterwards the video is upscaled again. The difference between the original (at each level) and the upscaled version is then coded on the higher layer. This method is supported by the MPEG 2 video standard [5] In [6] temporal scaling is achieved by spreading consecutive frames of a video sequence over a number of layers. 2.2. Implementation In the scope of this work, four different spatial video scaling algorithms have been implemented, where A1 A3 are DCT based, and A4 implements the DWT with a ....

Michael Merz, Konrad Froitzheim, Peter Schulthess, and Heiner Wolf, "Iterative transmission of media streams," in Proceedings of the conference on Multimedia '97. ACM, 1997, pp. 283--290.

....discussed in the context of multicast video[17] 18] 19] to accommodate heterogeneity while performing coarse grain congestion control. This differs from our approach that allows fine grain congestion control for unicast delivery with no step function changes in transmission rate. Merz et al. [20] present an iterative approach for sending high bandwidth video through a low bandwidth channel. They sug Total Transmit and Consumption Rates C=10 20 30 40 0 KB s Time 40s Kmax = 2 Data Buffered per Layer 9543 0 bytes Layer 0 Time 40s 9543 0 bytes Layer 1 Time 40s 9543 0 ....

M. Merz, K. Froitzheim, P. Schulthess, and H. Wolf, "Iterative transmission of media streams," Proc. ACM Multimedia, November 1997.

....without much effort if each frame is compressed independently without motion compensation. In this case the frames can be freely spread over different layers. Figure 7 describes a possible approach with three layers where a subsample of the image sequence is transmitted on each layer. Merz et al. [Mer97] describe a Web Movie System which makes use of this approach. Difficulties arise if the compression scheme takes motion compensation into account. Consider an MPEG compressed image sequence where dependencies between subsequent encoded frames exist due to motion compensation. If we distribute ....

....temporal layer. 2) Alternatively it is possible to perform the spatial segmentation first. This results in a set of layers where each layer adds to the quality of the images. The subsamples of the images on each layer are now distributed on sublayeres. Merz et al. describe both approaches in [Mer97] and found out that the first alternative can be implemented more efficiently. 4 MPEG video compression standards The standards for coding audio and visual data developed by the Motion Pictures Expert Group (MPEG) namely ISO IEC 11172 (MPEG 1) ISO IEC 13818 (MPEG 2) and ISO IEC 14496 (MPEG 4) ....

Michael Merz, Konrad Froitzheim, Peter Schulthess, and Heiner Wolf. Iterative Transmission of Media Streams. In Proceedings of the conference on Multimedia '97, pages 283--290. ACM, 1997.

....bits used to represent the color of a single pixel, the spatial dimension is defined by the width and height of the video, and the temporal resolution is represented by the number of frames per second. Several approaches have been developed in order to scale video in any of these three dimensions [Kuh98b, Bur83, Ami96, McC96, Mer97, Hof96]. For simplicity and due to performance we decided to use a simple scaling mechanism that reduces the temporal resolution [Kuh98a] of intra encoded H.261 video streams by relying on the RTP header information [Sch96b, Sch96a] as it is produced, e.g. by the video conferencing tool vic: If the ....

Michael Merz, Konrad Froitzheim, Peter Schulthess, and Heiner Wolf. Iterative Transmission of Media Streams. In Proceedings of the conference on Multimedia '97, pages 283--290. ACM, 1997.

....been discussed in the context of multicast video[9, 11, 22] to accommodate heterogeneity while performing coarse grain congestion control. This differs from our approach that allows fine grain congestion control for unicast delivery with no step function changes in transmission rate. Merz et al. [13] present an iterative approach for sending high bandwidth video through a low bandwidth channel. They suggest segmentation methods that provide the flexibility to playback a high quality stream over several iterations, allowing the client to trade startup latency for quality. Work in [7, 16, 19] ....

M. Merz, K. Froitzheim, P. Schulthess, and H. Wolf. Iterative transmission of media streams. Proc. ACM Multimedia, November 1997.

....been discussed in the context of multicast video[1, 11, 21] to accommodate heterogeneity while performing coarse grain congestion control. This differs from our approach that allows fine grain congestion control for unicast delivery with no step function changes in transmission rate. Merz et al. [13] present an iterative approach for sending high bandwidth video through a low bandwidth channel. They suggest segmentation methods that provide the flexibility to playback a high quality stream over several iterations, allowing the client to trade startup latency for quality. Work in [7, 16, 17] ....

M. Merz, K. Froitzheim, P. Schulthess, and H. Wolf. Iterative transmission of media streams. ACM Multimedia, November 1997.

No context found.

M. Merz, K. Froitzheim, P. Schulthess, and H. Wolf, \Iterative transmission of media streams," in Proceedings of the Conference on Multimedia '97, pp. 283-290, ACM, 1997.

Online articles have much greater impact   More about CiteSeer.IST   Add search form to your site   Submit documents   Feedback  

CiteSeer.IST - Copyright Penn State and NEC