Improved Image Coding Algorithm Based on Embedded Zerotree Wavelet

Based on analyzing the algorithm of EZW, an improved image coding algorithm is presented. The wavelet coefficients are decomposed into two groups and coded separately. Meanwhile, the subordinate pass is removed and the location information of significant coefficients does not need to be kept in memory, So that the times of scan in the algorithm of the EZW are reduced. Thereby, the coding speed is much improved and the number of coding symbols is reduced. Simulation result shows that the coding\decoding time is much reduced and the volume of coded stream is much smaller compared with the reference algorithm.