An Efficient Method for Region of Interest Coding in JPEG2000

The JPEG2000 standard defines two methods for region of interest (ROI) coding, the maximum shift and the general scaling. In the maximum shift method, an ROI can have any shape that does not need to be transmitted to the decoder, but does not have the flexibility to select an arbitrary scaling value to compromise the ROI quality compared with the background. The general scaling based method supports any scaling value providing the user/application with the ability to control ROI and background qualities, but it limits the choice of the ROI shape and needs ROI shape coding. In this paper, we propose a novel ROI coding method named Bitplane Overlap Shift (BOShift). The proposed BOShift is compatible with the JPEG2000 standard and it supports both arbitrary scaling values and arbitrary ROI shapes, without shape coding. Moreover, it encodes images with distinguished performance at low bit rates. Key-Words: JPEG2000, Region of Interest, ROI, Maximum Shift, Maxshift, General Scaling,