Title :
Quadtree-based multiregion multiquality image coding
Author :
Tasdoken, Sinan ; Cuhadar, Aysegul
Author_Institution :
Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, Ont., Canada
Abstract :
Region-based video coding schemes employed in MPEG-4 are also promising for still image coding applications where images contain a number of objects that can be encoded at different bit rates, such as compression of medical images for archiving and transmission. Motivated by this fact, in this letter we investigate multiregion multiquality (MRMQ) coding with quadtree-based wavelet coders. We present a novel scheme which addresses the region size sensitivity problem in region-based coding. The proposed method outperforms the region-of-interest (ROI) coding unit of JPEG-2000; it is possible to save 0.3 bits per pixel to attain the same ROI/background fidelity without sacrificing the additional features provided by JPEG-2000, such as resolution scalability and error resilience.
Keywords :
data compression; image resolution; medical image processing; quadtrees; video coding; JPEG-2000 coding unit; MPEG-4; SPIHT; background fidelity; bit rates; embedded zerotree block coding; error resilience; medical image compression; multiregion multiquality image coding; pixel; quadtree-based wavelet coders; region size sensitivity problem; region-based video coding schemes; region-of-interest; resolution scalability; set partitioning in hierarchical trees; still image coding applications; transmission; Biomedical imaging; Bit rate; Block codes; Discrete wavelet transforms; Encoding; Image coding; Image reconstruction; MPEG 4 Standard; Scalability; Shape;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2003.821661
