DocumentCode :
1985151
Title :
A pyramidal coder using a nonlinear filter bank
Author :
De Queiroz, Ricardo L. ; Florêncio, Dinei A F
Author_Institution :
Xerox Webster Res. Center, NY, USA
Volume :
3
fYear :
1996
fDate :
7-10 May 1996
Firstpage :
1570
Abstract :
We propose a novel pyramidal coder, which resembles the general structure of a JPEG coder, but which uses a nonlinear transform to replace the DCT. The nonlinear transform is obtained by the hierarchical application of a median filter predictor at subsampled versions of the original signal. The transformed samples are grouped into square blocks and used to replace the DCT in the JPEG baseline coder. The proposed coder shows several advantages: computation is greatly reduced compared to the DCT, image edges are better encoded, blocking is eliminated, and it allows lossless coding. Objective comparisons show the superiority of the proposed coder against both baseline and lossless JPEG
Keywords :
band-pass filters; discrete cosine transforms; filtering theory; image coding; image resolution; image sampling; median filters; transform coding; DCT; JPEG coder; baseline JPEG; image edges; lossless JPEG; lossless coding; median filter predictor; multiresolution analysis; nonlinear filter bank; nonlinear transform; objective comparisons; pyramidal coder; subsampled signal; Discrete cosine transforms; Discrete wavelet transforms; Ear; Filter bank; Image coding; Information filtering; Information filters; Nonlinear filters; Signal resolution; Spatial resolution;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1996. ICASSP-96. Conference Proceedings., 1996 IEEE International Conference on
Conference_Location :
Atlanta, GA
ISSN :
1520-6149
Print_ISBN :
0-7803-3192-3
Type :
conf
DOI :
10.1109/ICASSP.1996.544101
Filename :
544101
Link To Document :
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