Title :
Using dithering for elimination of coding artifact in lattice vector quantization of image subband
Author :
Ashourian, Mohsen ; Yusof, Zulkefli Muhammed ; Salleh, Shaikh Hussain Shaikh ; Bakar, Syed Abd Rahman Abu
Author_Institution :
Fac. of Electr. Eng., Univ. Technol. Malaysia, Johor, Malaysia
Abstract :
A joint optimization method for design of filter banks and related dithered quantizers by using time-domain formulation of filter banks is provided. Mathematical analysis and experiments show that in lattice vector quantization of the image subbands by appropriate choice of dither, it would be possible to replace signal-dependent artifacts with signal-independent white noise. This process improves the perceptual quality of reconstructed image, especially at low bit-rates and makes it more practical for a noise-removal algorithm to remove the output noise
Keywords :
channel bank filters; circuit optimisation; digital filters; image coding; image reconstruction; time-domain synthesis; vector quantisation; white noise; coding artifact elimination; dithered quantizers; filter banks design; image subband; joint optimization method; lattice VQ; lattice vector quantization; noise-removal algorithm; output noise; reconstructed image quality; signal-dependent artifacts; signal-independent white noise; time-domain formulation; Filter bank; Image coding; Image reconstruction; Lattices; Noise cancellation; Optimization methods; Random variables; Signal processing; Signal synthesis; Vector quantization;
Conference_Titel :
TENCON 2000. Proceedings
Conference_Location :
Kuala Lumpur
Print_ISBN :
0-7803-6355-8
DOI :
10.1109/TENCON.2000.892269
