Table of Contents
International Scholarly Research Notices
Volume 2014, Article ID 876434, 11 pages
http://dx.doi.org/10.1155/2014/876434
Research Article

Edge Preserved Speckle Noise Reduction Using Integrated Fuzzy Filters

1Indian Institute of Technology Roorkee, Roorkee 247 667, India
2Post Graduate Institute of Medical Education and Research, Chandigarh 160 012, India

Received 6 April 2014; Revised 19 July 2014; Accepted 21 July 2014; Published 30 October 2014

Academic Editor: Jinshan Tang

Copyright © 2014 Nagashettappa Biradar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Echocardiographic images are inherent with speckle noise which makes visual reading and analysis quite difficult. The multiplicative speckle noise masks finer details, necessary for diagnosis of abnormalities. A novel speckle reduction technique based on integration of geometric, wiener, and fuzzy filters is proposed and analyzed in this paper. The denoising applications of fuzzy filters are studied and analyzed along with 26 denoising techniques. It is observed that geometric filter retains noise and, to address this issue, wiener filter is embedded into the geometric filter during iteration process. The performance of geometric-wiener filter is further enhanced using fuzzy filters and the proposed despeckling techniques are called integrated fuzzy filters. Fuzzy filters based on moving average and median value are employed in the integrated fuzzy filters. The performances of integrated fuzzy filters are tested on echocardiographic images and synthetic images in terms of image quality metrics. It is observed that the performance parameters are highest in case of integrated fuzzy filters in comparison to fuzzy and geometric-fuzzy filters. The clinical validation reveals that the output images obtained using geometric-wiener, integrated fuzzy, nonlocal means, and details preserving anisotropic diffusion filters are acceptable. The necessary finer details are retained in the denoised echocardiographic images.