An Algorithm for a Fast Estimation of the Wavelet Subbands Statistics (CROSBI ID 485326)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
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
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o prilogu
284-287-x.
2001.
nije evidentirano
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