Show simple item record

dc.contributor.authorVázquez Alcocer, Pere Pau
dc.contributor.authorSbert Cassasayas, Mateu
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Llenguatges i Sistemes Informàtics
dc.identifier.citationVázquez, P.; Sbert, M. Bandwidth reduction for remote navigation systems through view prediction and progressive transmission. "Future generation computer systems", 2004, vol. 20, núm. 8, p. 1251-1262.
dc.description.abstractRemote navigation systems, such as exploration of virtual 3D worlds or remote surgery, usually require higher bandwidth than the Internet connection commonly available at home. In this paper,we explore a set of techniques to reduce the bandwidth required by these applications. Our system consists of a client PC equipped with a graphics card, and a remote high-end server. The server hosts the remote environment and does the actual rendering of the scenes for several clients, and the new image is passed to them. This scheme is suitable when the data has a copyright or when its size may exceed the rendering capabilities of the client. The general scheme is the following: each time the position changes, the newviewis predicted by both the client and the server and the difference information between the predicted view and the correct one is sent to the client. To reduce bandwidth we can improve the prediction method, and the transmission system. We present here two groups of techniques: First, a set of lossless methods which achieve reductions of up to a 9:1 ratio. These are a combination of a two-level forward warping, that takes advantage of spatial coherence, and a masking method, which allows to transmit only the information that really needs to be updated. Second, a set of lossy methods suitable for very low bandwidth environments which involve both progressive transmission and image reuse. They consider relevant parameters such as the number of pixels, the amount of information they provide, and their colour deviation in order to create a strategy for prioritizing the information transmission. This system allows to improve up to an additional 4:1 ratio. The quality of the generated images is very high, and often indistinguishable from the correct ones.
dc.format.extent12 p.
dc.publisherElsevier Science Direct
dc.subjectÀrees temàtiques de la UPC::Informàtica::Infografia
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació::Processament del senyal::Processament de la imatge i del senyal vídeo
dc.subject.lcshRendering (Computer graphics)
dc.subject.otherBandwidth reduction
dc.subject.otherRemote navigation
dc.subject.otherImage-based rendering
dc.subject.otherInformation theory
dc.titleBandwidth reduction for remote navigation systems through view prediction and progressive transmission
dc.subject.lemacTelecomunicació de banda ampla, Sistemes de
dc.contributor.groupUniversitat Politècnica de Catalunya. MOVING - Grup de Recerca en Modelatge, Interacció i Visualització en Realitat Virtual
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (published version)
local.citation.authorVázquez, P.; Sbert, M.
local.citation.publicationNameFuture generation computer systems

Files in this item


This item appears in the following Collection(s)

Show simple item record

All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder