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Proceedings Paper

A new JPEG2000 region-of-interest coding method: generalized partial bitplanes shift
Author(s): Yan Liang; Wenyao Liu
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Paper Abstract

Region-of-interest (ROI) image coding is an interesting feature in JPEG2000, which allows for encoding the ROIs in an image with better quality than the background (BG). Considering the limitations of two standard ROI coding methods, a new ROI coding method called generalized partial bitplanes shift (GPBShift) is presented in this paper. To control the relative importance between ROI and BG, the method divides the bitplanes of ROI and BG coefficients into two parts by using scaling values S1 and S2, respectively. Instead of shifting the bitplanes all at once by the same scaling value S in the standard methods, GPBShift shifts part of them on the basis of the bitplane shifting scheme. The GPBShift not only can code arbitrarily shaped ROI without explicitly transmitting any shape information to the decoder, but also flexibly select the scaling values to adjust relative compression quality in ROI and BG. Additionally, the method can efficiently code multiple ROI with different priorities in an image. Experimental results show that the GPBShift method can provide significantly better visual quality than the Maxshift method at low bit rates, and higher coding efficiency than the general scaling based method.

Paper Details

Date Published: 8 February 2005
PDF: 7 pages
Proc. SPIE 5637, Electronic Imaging and Multimedia Technology IV, (8 February 2005); doi: 10.1117/12.573246
Show Author Affiliations
Yan Liang, Tianjin Univ. (China)
Wenyao Liu, Tianjin Univ. (China)


Published in SPIE Proceedings Vol. 5637:
Electronic Imaging and Multimedia Technology IV
Chung-Sheng Li; Minerva M. Yeung, Editor(s)

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