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: Video Compressed Traces: Multifractal and Fractal Analysis | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article iD 75217 Pages 1-13 DOI ASP 2006 75217 AVC Video Compressed Traces Multifractal and Fractal Analysis Irini Reljin 1 Andreja SamCoviC 2 and Branimir Reljin1 1 Faculty of Electrical Engineering University of Belgrade 11000 Belgrade Serbia and Montenegro 2 Faculty of Traffic and Transport Engineering University of Belgrade 11000 Belgrade Serbia and Montenegro Received 1 August 2005 Revised 1 January 2006 Accepted 30 April 2006 Publicly available long video traces encoded according to AVC were analyzed from the fractal and multifractal points of view. It was shown that such video traces as compressed videos and MPEG-4 Version 2 exhibit inherent long-range dependency that is fractal property. Moreover they have high bit rate variability particularly at higher compression ratios. Such signals may be better characterized by multifractal MF analysis since this approach describes both local and global features ofthe process. From multifractal spectra ofthe frame size video traces it was shown that higher compression ratio produces broader and less regular MF spectra indicating to higher MF nature and the existence of additive components in video traces. Considering individual frames I P and B and their MF spectra one can approve additive nature of compressed video and the particular influence of these frames to a whole MF spectrum. Since compressed video occupies a main part of transmission bandwidth results obtained from MF analysis of compressed video may contribute to more accurate modeling of modern teletraffic. Moreover by appropriate choice of the method for estimating MF quantities an inverse MF analysis is possible that means from a once derived MF spectrum of observed signal it is possible to recognize and extract parts of the signal which are characterized by particular values of multifractal parameters. Intensive simulations and results
