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% Matlab implementation of SPIHT (without Arithmatic coding stage) 
% 
% The function in this toolbox are listed as follow: 
% 
% func_SPIHT_Main -- Main function 
% 
% func_SPIHT_Eec -- Encoder 
% 
% func_SPIHT_Dec -- Decoder 
% 
% func_DWT -- Wavelet decomposition 
% 
% func_InvDWT -- Inverse wavelet decomposition 
% 
% func_ReadRaw -- Read a RAW format gray scale image from disk 
% 
% --------------------------- 
%   Performance evaluation : this toolbox VS. SPIHT 
% 
%   Test image: lena512.raw 
% 
%   bpp	    SPIHT(dB) This code(dB) 
%   0.1000   29.8107	29.3202 
%   0.2000   32.7202	32.2514 
%   0.3000   34.5479	34.0331 
%   0.4000   35.8422	35.4857 
%   0.5000   36.8623	36.5939 
%   0.6000   37.6650	37.3759 
%   0.7000   38.2581	38.0491 
%   0.8000   38.9390	38.7058 
%   0.9000   39.5218  	39.3437 
% 
% Ref. 
% Amir Said and William A. Pearlman, "A New Fast and Efficient Image Codec Based on Set Partitioning in Hierarchical Trees,"  
% IEEE Transactions on Circuits and Systems for Video Technology, vol. 6, pp. 243-250, June 1996. 
% --------------------------- 
% If you can improve this code furtherly or add arithmatic coding stage, please let me know. Thanks 
% 
% Jing Tian 
% Contact me : scuteejtian@hotmail.com 
% This program is part of my undergraduate project in GuangZhou, P. R. China. 
% April - July 1999