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Bibliographic record number: 91508

Journal

Authors: Rimac-Drlje, Snježana; Zovko-Cihlar, Branka; Grgić, Sonja
Title: An Algorithm for a Fast Estimation of the Wavelet Subbands Statistics
Source: Proceedings of the 3rd EURASIP Conference focused on Digital Signal Processing for Multimedia Communications and Services, ECMCS'2001 / Kalman Fazekas (ed). - Budapest, Hungary : Scientific Association of Infocommunications - HTE , 2001. 284-287.
Meeting: 3rd EURASIP Conference focused on Digital Signal Processing for Multimedia Communications and Services, ECMCS'2001
Location and date: Budimpešta, Mađarska, 11-13.09.2001.
Keywords: Wavelet Transform; Image Compression; Probability Density Function; Quantization Noise
Abstract:
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.
Type of meeting: Predavanje
Type of presentation in a journal: Full-text (1500 words and more)
Type of peer-review: International peer-review
Project / theme: 036015, 036041
Original language: ENG
Category: Znanstveni
Research fields:
Electrical engineering



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