tailieunhanh - Báo cáo hóa học: " Research Article Self-Conducted Allocation Strategy of Quality Layers for JPEG2000"

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: Research Article Self-Conducted Allocation Strategy of Quality Layers for JPEG2000 | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 728794 8 pages doi 2008 728794 Research Article Self-Conducted Allocation Strategy of Quality Layers for JPEG2000 Francesc Aulí-Llinàs 1 2 Joan Bartrina-Rapesta 2 and Joan Serra-Sagrista2 1 Department of Electrical and Computer Engineering University of Arizona Tucson AZ 85721 USA 2 Departament d Enginyeria de la Informacio i de les Comunicacions Universitat Autonoma de Barcelona 08290 Cerdanyola del Valles Barcelona Spain Correspondence should be addressed to Francesc Aulí-Llinàs Received 5 August 2008 Revised 27 October 2008 Accepted 12 November 2008 Recommended by Christophoros Nikou The rate-distortion optimality of a JPEG2000 codestream is determined by the density and distribution of the quality layers it contains. The allocation of quality layers is therefore a fundamental issue for JPEG2000 encoders which commonly distribute layers logarithmically or uniformly spaced in terms of bitrate and use a rate-distortion optimization method to optimally form them. This work introduces an allocation strategy based on the hypothesis that the fractional bitplane coder of JPEG2000 already generates optimal truncation points for the overall optimization of the image. Through these overall optimal truncation points the proposed strategy is able to allocate quality layers without employing rate-distortion optimization techniques to self-determine the density and distribution of quality layers and to reduce the computational load of the encoder. Experimental results suggest that the proposed method constructs near-optimal codestreams in the rate-distortion sense achieving a similar coding performance as compared with the common PCRD-based approach. Copyright 2008 Francesc Aulí-Llinàs et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction