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Region-Based Embedded Image Coding using Partial Subbands Maximum Bitplanes Shift

The region of interest (ROI) coding is an important application of region-based still image coding and can encode these significant regions with higher quality than others (background). In this paper, we present a new region-based image coding method called partial subbands maximum bitplanes shift (PSMBShift). The new method applies different scaling strategies for the different frequency subbands of wavelet image. In low and mediate frequency subbands, the maxshift method recommended by JPEG2000 standard is used to scale all bitplanes of the ROI coefficients. In high frequency subbands, only the partial most significant bitplanes of the ROI coefficients are scaled and the other bitplanes of the ROI coefficients are obtained in original position. The experiments show that the PSMBShift method can not only combine the advantages of the two standard methods of JPEG2000, but also can control efficiently the quality between the ROIs and BG by adjusting scaling values of high frequency subbands