tailieunhanh - Báo cáo hóa học: " Breakpoint Tuning in DCT-Based Nonlinear Layered Video Codecs"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Breakpoint Tuning in DCT-Based Nonlinear Layered Video Codecs | EURASIP Journal on Applied Signal Processing 2004 16 2555-2570 2004 Hindawi Publishing Corporation Breakpoint Tuning in DCT-Based Nonlinear Layered Video Codecs Pedro Cuenca Departamento de Informatica Escuela Politecnica Superior de Albacete Universidad de Castilla-La Mancha Campus Universitario 02071 Albacete Spain Email pedro. cuenca@ Luis Orozco-Barbosa Departamento de Informatica Escuela Politecnica Superior de Albacete Universidad de Castilla-La Mancha Campus Universitario 02071 Albacete Spain Email Francisco Delicado Departamento de Informatica Escuela Politecnica Superior de Albacete Universidad de Castilla-La Mancha Campus Universitario 02071 Albacete Spain Email Antonio Garrido Departamento de Informatica Escuela Politecnica Superior de Albacete Universidad de Castilla-La Mancha Campus Universitario 02071 Albacete Spain Email Received 31 August 2003 Revised 2 February 2004 Many studies have been conducted to evaluate the benefits of using layered video coding schemes as a means to improve the robustness of video communications systems. In this paper we study a frame-aware nonlinear layering scheme for the transport of a DCT-based video over packet-switched networks. This scheme takes into account the relevance of the different elements of the video sequence composing the encoded video sequence. Throughout a detailed study over a large set of video streams we show that by properly tuning the encoding parameters it is feasible to gracefully degrade or even maintain the video quality while reducing the amount of data representing the video sequence. We then provide the major guidelines to properly tune up the encoding parameters allowing us to set the basis towards the development of more robust video communications systems. Keywords and phrases DCT nonlinear layering video coding video communications video quality. 1. INTRODUCTION Recent developments in the areas of video .

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