SPIHT Coding Proposed by Said and Pearlman in 1996 Regard tree as the unit Idea of zerotree A. Said and W. A. Pearlman, “A new, fast, and efficient image codec based on set partitioning in hierarchical trees, ” IEEE Trans. Circuits Syst. Video Technol., vol. 6, no. 3, pp. 243-250, June 1996.