A Compression Algorithm of Wavelet Image with Fast Zerotree Encoding

This paper presents a new fast coding method of wavelet image with zerotree encoding. Based on the definition of multi-stage zerotree root and encoding imformation form, using optimized scalar quantization, this paper adopts different thresholds and different size of quantization codebood to each wavelet subband and confficients of each directions. It fully employs the importance degree of the subband coefficients and visual characteristic of mankind, which can compress the high frequency wavelet coefficients efficiently.The method only makes one time zerotree encoding, thus greatly reduces the encoding time.