关键词: 最大位移法，感兴趣区，小波系数掩模，嵌入式零树小波，JPEG2000

Abstract: Through carefully analyzing both the advantages and disadvantages of the two kinds of ROI coding methods in JPEG2000,and then statistically analyzing the energy of ROI coefficients of wavelet transform in each subband,we proposed selecting and shifting important subband by ROI mask and the energy based on the wavelet transform, simultaneously expanding the important subband which should meet the the "Zero-tree" characteristic, a new region of interest(ROI) coding method based on selecting subband and bitplane shift was proposed. This schcxne has several novel-ties;(1) flexibly adjust the compression quality of the ROI and the ROB; (2) code multiple ROIs at various degrees of interest; (3) arbitrarily shape ROI coding without coding the shape. Experimental results validate the validity of proposed algorithm.

Key words: Maxshift method, Region of interest(ROI)，Wavelet coefficient mask, Embedded zero-tree wavelet,JPEG2000