Rate-distortion optimization for the SPIHT encoder
K.K. Lin, Robert M. Gray · 2002
We study the rate-distortion performance of the set partitioning in hierarchical trees (SPIHT) image compression algorithm and present an optimization method that produces the bit stream with minimum Lagrangian cost J=D+/spl lambda/R for a given stopping criterion. Although there are only three applicable stop points at each bit plane, experiments show that substantial improvements can be obtained over a wide range of bit rates.