A new fast rate control algorithm for JPEG2000

摘要

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.