DocumentCode :
699542
Title :
Impulse noise correction in an image transmission system by means of an oversampled filter bank code
Author :
Marinkovic, Slavica ; Guillemot, Christine
Author_Institution :
IRISA-INRIA, Rennes, France
fYear :
2004
fDate :
6-10 Sept. 2004
Firstpage :
241
Lastpage :
244
Abstract :
Quantized frame expansions based on block transforms and oversampled filter banks (OFB) have been considered recently as joint source-channel codes for erasure and error resilient signal transmission over noisy channels. This paper examines the problem of syndrome decoding and especially of error localization and correction in quantized OFB signal expansions. The error localization problem is treated as an M-ary hypothesis testing problem. The tests are derived from the joint probability density function of the syndromes under various hypothesis of impulse noise positions and in a number of consecutive windows of the received samples (to account for the encoding memory of the convolutional code). The error amplitudes are then estimated from the syndrome equations by solving them in the least square sense. The message signal is reconstructed from the corrected received signal by a pseudoinverse receiver. The algorithm is applied to joint source and channel coding (JSCC) of images based on oversampled wavelet filter banks.
Keywords :
channel bank filters; combined source-channel coding; convolutional codes; decoding; error correction; image coding; image filtering; image reconstruction; impulse noise; least squares approximations; probability; wavelet transforms; M-ary hypothesis testing problem; OFB signal expansions; block transforms; convolutional code; error amplitudes; error correction; error localization problem; error resilient signal transmission; image transmission system; impulse noise correction; impulse noise positions; joint probability density function; joint source-channel codes; message signal; noisy channels; oversampled filter bank code; oversampled wavelet filter banks; pseudoinverse receiver; quantized frame expansions; syndrome decoding; syndrome equations; Abstracts; Filter banks; Image communication; PSNR;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signal Processing Conference, 2004 12th European
Conference_Location :
Vienna
Print_ISBN :
978-320-0001-65-7
Type :
conf
Filename :
7080072
Link To Document :
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