JPEG2000 is an international standard for still image coding and provides an extensive set of features vital to many high-end and emerging applications. The default performance metric for JPEG2000 is an optimisation of objective quality versus bit-rate. However, for high compression applications, it would be more appropriate that regions of interest are prioritised for interpretability. JPEG2000 allows for this in its region of interest (ROI) feature. JPEG2000 provides many different ROI coding mechanisms, namely the general scaling method, max-shift method, bitplane-by-bitplane shift method (BbBShift), partial significant bit-plane shift method (PSBShift) and ROITCOP (ROI coding through component priority) method. These method have advantages and disadvantages relative to one another and the choice of methods for ROI coding is very much dependant on the requirements of the application at hand.

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JPEG2000 ROI BbBShift ROITCOP