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An Algorithm for a Fast Estimation of the Wavelet Subbands Statistics (CROSBI ID 485326)

Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija

Rimac-Drlje, Snježana ; Zovko-Cihlar, Branka ; Grgić, Sonja An Algorithm for a Fast Estimation of the Wavelet Subbands Statistics // Proceedings of the 3rd EURASIP Conference focused on Digital Signal Processing for Multimedia Communications and Services, ECMCS'2001 / Kalman Fazekas (ur.). Budimpešta: Scientific Association of Infocommunications - HTE, 2001. str. 284-287-x

Podaci o odgovornosti

Rimac-Drlje, Snježana ; Zovko-Cihlar, Branka ; Grgić, Sonja

engleski

An Algorithm for a Fast Estimation of the Wavelet Subbands Statistics

Discrete wavelet transform - DWT is successfuly used for image compression in different coders. The knowledge of DWT coefficients statistics can improve behavior of the coding techniques. The paper proposes a fast algorithm for estimation of the wavelet coefficients probability density function - PDF. Wavelet subband PDF is approximated well by generalized Gaussian function, but parameter k of that function widely differs for different subbands, and it also differs for different images. The parameter k determines the shape of the PDF and it influences compression ratio and quantization noise power in the image compression procedure. The proposed algorithm is based on the quantization noise power dependance on the parameter k. We show the usage of the estimated PDF for calculation of the mass center of quantization intervals, which we used as reconstruction levels. So, we obtained an improvement in PSNR (Peak Signal-to-Noise Ratio) of reconstructed images between 0.25 and 0.4 dB.

Wavelet Transform; Image Compression; Probability Density Function; Quantization Noise

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Podaci o prilogu

284-287-x.

2001.

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objavljeno

Podaci o matičnoj publikaciji

Proceedings of the 3rd EURASIP Conference focused on Digital Signal Processing for Multimedia Communications and Services, ECMCS'2001

Kalman Fazekas

Budimpešta: Scientific Association of Infocommunications - HTE

Podaci o skupu

3rd EURASIP Conference focused on Digital Signal Processing for Multimedia Communications and Services, ECMCS'2001

predavanje

11.09.2001-13.09.2001

Budimpešta, Mađarska

Povezanost rada

Elektrotehnika