Đang chuẩn bị liên kết để tải về tài liệu:
Báo cáo hóa học: " Hybrid Video Coding Based on Bidimensional Matching Pursuit"

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: Hybrid Video Coding Based on Bidimensional Matching Pursuit | EURASIP Journal on Applied Signal Processing 2004 17 2705-2714 2004 Hindawi Publishing Corporation Hybrid Video Coding Based on Bidimensional Matching Pursuit Lorenzo Granai Signal Processing Institute Swiss Federal Institute of Technology EPFL 1015 Lausanne Switzerland Email lorenzo.granai@epfl.ch Emilio Maggio Department of Electronic Engineering Queen Mary University of London London E1 4NS UK Email emilio.maggio@elec.qmul.ac.uk Lorenzo Peotta Signal Processing Institute Swiss Federal Institute of Technology EPFL 1015 Lausanne Switzerland Email lorenzo.peotta@epfl.ch Pierre Vandergheynst Signal Processing Institute Swiss Federal Institute of Technology EPFL 1015 Lausanne Switzerland Email pierre.vandergheynst@epfl.ch Received 23 February 2004 Revised 1 July 2004 Recommended for Publication by Mark Liao Hybrid video coding combines together two stages first motion estimation and compensation predict each frame from the neighboring frames then the prediction error is coded reducing the correlation in the spatial domain. In this work we focus on the latter stage presenting a scheme that profits from some of the features introduced by the standard H.264 AVC for motion estimation and replaces the transform in the spatial domain. The prediction error is so coded using the matching pursuit algorithm which decomposes the signal over an appositely designed bidimensional anisotropic redundant dictionary. Comparisons are made among the proposed technique H.264 and a DCT-based coding scheme. Moreover we introduce fast techniques for atom selection which exploit the spatial localization of the atoms. An adaptive coding scheme aimed at optimizing the resource allocation is also presented together with a rate-distortion study for the matching pursuit algorithm. Results show that the proposed scheme outperforms the standard DCT especially at very low bit rates. Keywords and phrases image processing greedy algorithms matching pursuit redundant dictionaries video coding H.264 .