Region-of-Interest Image Coding Based on Perceptually Optimized Bitplane Realignment

Region-of-interest (ROI) image coding is one of the new features included in the JPEG2000 image coding standard. Two methods are defined in the standard: the Maxshift method and the generic scaling based method. In this paper, a new region-of-interest coding method called Perceptually Optimized Shift (POShift) is proposed. Unlike other proposed methods, the POShift method realigns the bitplanes based on perceptually optimized order, which makes the visually most important bitplanes (in both ROI and BG) to be coded firstly. Experimental results indicate that the proposed method significantly outperforms the previous ROI coding schemes in overall ROI coding performance.