DocumentCode :
379878
Title :
The variable-length generalized lapped biorthogonal transform
Author :
Tran, Trac D. ; De Queiro, Ricardo L. ; Nguyen, Truong Q.
Author_Institution :
Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA
fYear :
1998
fDate :
4-7 Oct 1998
Firstpage :
697
Abstract :
This paper introduces a class of linear phase lapped biorthogonal transforms with basis functions of variable length (VLGLBT). The transform can be characterized by a lattice which structurally enforces both linear phase and perfect reconstruction properties as well as provides a fast and efficient transform implementation. Our main motivation of the new transform is its application in image coding. The VLGLBT has several long overlapped basis functions for representing smooth signals to avoid blocking artifacts. The rest of the bases covering high-frequency bands are constrained to be short to limit ringing artifacts. The relaxation of the orthogonal constraint allows the VLGLBT to have significantly different analysis and synthesis banks which can be tailored appropriately to obtain high-quality reconstructed images. Most importantly, the variable-length property allows us to design very fast and low-complexity transforms. Comparing to the popular DCT, a fast VLGLBT named FLT only requires 6 more multiplications and 8 more additions. Yet, image coding examples show that the FLT is far superior than the DCT and is close to the 9/7-tap biorthogonal wavelet in both objective and subjective coding performance
Keywords :
channel bank filters; data compression; filtering theory; image coding; image reconstruction; image representation; linear phase filters; transform coding; transforms; DCT; FLT; analysis filter banks; basis functions; biorthogonal wavelet; blocking artifacts avoidance; efficient transform; fast VLGLBT; fast transform; high-frequency bands; high-quality reconstructed images; image coding; linear phase lapped biorthogonal transforms; low-complexity transforms; objective coding performance; overlapped basis functions; perfect reconstruction filter banks; ringing artifacts; smooth signal representation; subjective coding performance; synthesis filter banks; variable-length generalized lapped biorthogonal transform; variable-length lattice; Discrete cosine transforms; Discrete transforms; Image analysis; Image coding; Image quality; Image reconstruction; Lattices; Nonlinear filters; Signal synthesis; Transform coding;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Image Processing, 1998. ICIP 98. Proceedings. 1998 International Conference on
Conference_Location :
Chicago, IL
Print_ISBN :
0-8186-8821-1
Type :
conf
DOI :
10.1109/ICIP.1998.999054
Filename :
999054
Link To Document :
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