IEEE Signal Processing Letters,
vol. 9, no. 5, May 2002
Bitplane-by-Bitplane
Shift (BbBShift) - A Suggestion for JPEG 2000 Region of Interest Coding
Laboratory for Image and Video Engineering (LIVE),
Department of Electrical and Computer Engineering, The University of Texas at
Austin, Austin, TX 78712-1084
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).