A modified SPIHT algorithm
DU Jiang-fan · Journal of Chongqing University of Posts and Telecommunications · 2003
Set partitioning in Hierarchical Trees(SPIHT)coding,introduced by A.Said and W.A.Pearlman is a fast and efficient technique for image compression. Most signs of the coefficients in the highest pyramid level are positive after wave let transformation. If the 9/7-tap filter of [3] is selected,the ratios of posi ti ve coefficients to the total coefficients in the highest pyramid level are very high.Thus the performance by exploiting this character can be improved.