In desktop video conferencing systems, the quality of video as well as the response speed of user′s data is important element of systematic performance. In this paper, four video and data multiplexing strategies in t...In desktop video conferencing systems, the quality of video as well as the response speed of user′s data is important element of systematic performance. In this paper, four video and data multiplexing strategies in terminals: the Alternate Method, the Video Priority Method, the Data Priority Method, and the Dynamic Priority Method, are investigated. Their influences on transmission performances of data and video are discussed.展开更多
Based on the geometrical relationships between image pixels and projection rays at different viewing angles,a Multiorientation Simultaneous Back Projection (MSBP) approach is proposed in this papar for two-dimensional...Based on the geometrical relationships between image pixels and projection rays at different viewing angles,a Multiorientation Simultaneous Back Projection (MSBP) approach is proposed in this papar for two-dimensional (2-D) parallel and fan beam CT systems. In this scheme, backprojections for eight views, 6, π/2 - θ, π/2 + 6, π- θ, π+ θ, 3π/2 - θ, 3π/2 + θ, and 2π- θ, are implemented at the same time,while the locating operation of pixels for interpolation and computation of weighting parameters are only required for one of them when one half of the number of thaws is even. Implementation remits on an Intel 80386 hosed computer show that the proposed method has a notable computational gain,compared with the conventional implementation of backprojection.展开更多
文摘In desktop video conferencing systems, the quality of video as well as the response speed of user′s data is important element of systematic performance. In this paper, four video and data multiplexing strategies in terminals: the Alternate Method, the Video Priority Method, the Data Priority Method, and the Dynamic Priority Method, are investigated. Their influences on transmission performances of data and video are discussed.
文摘Based on the geometrical relationships between image pixels and projection rays at different viewing angles,a Multiorientation Simultaneous Back Projection (MSBP) approach is proposed in this papar for two-dimensional (2-D) parallel and fan beam CT systems. In this scheme, backprojections for eight views, 6, π/2 - θ, π/2 + 6, π- θ, π+ θ, 3π/2 - θ, 3π/2 + θ, and 2π- θ, are implemented at the same time,while the locating operation of pixels for interpolation and computation of weighting parameters are only required for one of them when one half of the number of thaws is even. Implementation remits on an Intel 80386 hosed computer show that the proposed method has a notable computational gain,compared with the conventional implementation of backprojection.
