Daoud Berkani

Work place: Lab. Signal & Communications, École Nationale Polytechnique, 10 Avenue Hassen Badi, BP 182, El-Harrach, Alger 16200, Algérie

E-mail: daoud.berkani@g.enp.edu.dz

Website:

Research Interests: Data Structures and Algorithms, Speech Synthesis, Speech Recognition, Image Processing, Image and Sound Processing, Computer systems and computational processes

Biography

Daoud Berkani (MS Red AwardPolytechnic Kiev, & Sc. D. - National Polytechnic School). From 1992 to 1995, He has been conducting research in the area of speech coding and processing in adverse conditions (Sherbrook University). He is now full Professor (NPS). His current research interests include signal and communications, information theory concepts, clustering and adaptive algorithms applied to speech and image processing. He is the author of more than 150 papers.

Author Articles
Combination of Spatial Filtering and Adaptive Wavelet Thresholding for Image Denoising

By Abdelhak Bouhali Daoud Berkani

DOI: https://doi.org/10.5815/ijigsp.2017.05.02, Pub. Date: 8 May 2017

Thresholding in wavelet domain has proven very high performances in image denoising and particularly for homogeneous ones. Conversely, and in cases of relatively non-homogeneous scenes, it often induces the loss of some true coefficients; inducing so, to smoothing the details and the different features of the thresholded image. Therefore, and in order to overcome this shortcoming, we introduce within this paper a new alternative made by a combination of advantages of both spatial filtering and wavelet thresholding; that ensures well removing the noise effect while preserving the different features of the considered image. First, the degraded image is decomposed into wavelet coefficients via a 2-level 2D-DWT. Then, the finest detail sub-bands likely due to noise, are thresholded in order to maximally cancel the noise contribution. The remaining noise shared across the coarse detail subbands (LH2, HL2, and HH2) is cleaned by filtering these mentioned sub-bands via an adaptive wiener filter instead of thresholding them; avoiding so smoothing the acquired image. Finally, a joint bilateral filter (JBF) is applied to ensure the preservation of the different image features. Experimental results show notable performances of our new proposed scheme compared to the recent state-of-the-art schemes visually and in terms of (MSE), (PSNR) and correlation coefficient.

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