IEEE Signal Processing Letters, vol. 9, no. 5, May 2002


Bitplane-by-Bitplane Shift (BbBShift) - A Suggestion for JPEG 2000 Region of Interest Coding

Zhou Wang and Alan C. Bovik

Laboratory for Image and Video Engineering (LIVE), Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712-1084

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Abstract: The JPEG2000 image coding standard defines two kinds of region of interest (ROI) coding methods the general scaling based method and the maximum shift (Maxshift) method. The former requires shape coding of the ROIs, which leads to increased complexity of codec implementations and limits the choice of ROI shapes (currently, only rectangle and ellipse shapes are defined). The latter allows for arbitrarily shaped ROI coding without explicitly transmitting any shape information to the decoder, but does not have the flexibility to select an arbitrary scaling value to define the relative importance of the ROI and the background wavelet coefficients. We propose a bitplane-by-bitplane shift (BbBShift) method, which supports both arbitrary ROI shape and arbitrary scaling without shape coding.

Index Terms image coding, JPEG2000, region of interest (ROI), bitplane coding, wavelet coding, maximum shift (Maxshift), Bitplane-by-Bitplane shift (BbBShift).