In this paper

a new fast embedded zerotree wavelet(EZW) image coder based on relation matrix is presented.Firstly

the discrete wavelet transform is performed on the origin image.Secondly

the wavelet coefficients of the lowest frequency subband are encoded by using DPCM.Thirdly

the zerotrees are defined for the wavelet coefficients of the high frequency subbands.Finally

the initial threshold is identified and relation matrix is constructed

and the wavelet coefficients of the high frequency subbands are encoded progressively by using relation matrix.The experiment results show that the new still image compression scheme provides higher perceptual quality and less encoding time than EZW

especially at low bit rates.