Authors: Wu Zongze
Addresses: School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510630, China
Abstract: A simplification scheme is proposed to facilitate calculation of the Rate-Distortion slopes (RD-slopes) by means of logarithm expression. The other approach is used to fast truncate the code streams, which can find all the truncation points for every code-block through a round search among the 256 quality layers based on the 8-bit RD-slopes of the coding passes. The new rate control algorithm not only speeds up the process of rate allocation but also uses less memory. Experimental results show that the quality of reconstructed images has only slightly decreased.
Keywords: JPEG2000; rate-distortion slopes; RD-slopes; quality layers; truncation point; rate control; coding passes; code stream truncation; rate allocation; image reconstruction.
International Journal of Modelling, Identification and Control, 2006 Vol.1 No.3, pp.159 - 163
Published online: 03 Jan 2007 *Full-text access for editors Access for subscribers Purchase this article Comment on this article