Improved code method for FGS with function of ROI

An improved code method based on subband coding is proposed for FGS with the function of ROI in this paper.In encoding for the enhancement layer,residue coefficients are first reordered to form subbands of wavelet.Bitplanes of the coefficients are then implemented through the max-shift method to achieve the function of ROI.Lastly,the SPIHT coding method is used to eliminate the data redundancies.Experiment results show that the proposed method can achieve a good function of ROI and that it has higher coding efficiency than that of the original FGS enhancement layer.