Wavelet Image Coder Research Evolution
小波图像编码器研究进展

The research of wavelet coders has been being active since Mallat found the fast algorithm of wavelet transform.The novel compression standards JPEG2000 and MPEG-4,both using wavelent transform,will be finished in this year.There are two main factors which have relations with the performance of the wavelet image coders.One is the construction and selection of the Wavelet basis;the other is the quantization and coding of AC coefficients.After introducing the architecture of a general wavelet image coder,this paper discusses the selection of wavelet basis and the quantization of AC coefficients.At last,the paper introduces a few image coders which are suitable for the internet applications.