Open Access

Speckle Reduction and Structure Enhancement by Multichannel Median Boosted Anisotropic Diffusion

EURASIP Journal on Advances in Signal Processing20042004:615075

https://doi.org/10.1155/S1110865704402091

Received: 31 August 2003

Published: 2 December 2004

Abstract

We propose a new approach to reduce speckle noise and enhance structures in speckle-corrupted images. It utilizes a median-anisotropic diffusion compound scheme. The median-filter-based reaction term acts as a guided energy source to boost the structures in the image being processed. In addition, it regularizes the diffusion equation to ensure the existence and uniqueness of a solution. We also introduce a decimation and back reconstruction scheme to further enhance the processing result. Before the iteration of the diffusion process, the image is decimated and a subpixel shifted image set is formed. This allows a multichannel parallel diffusion iteration, and more importantly, the speckle noise is broken into impulsive or salt-pepper noise, which is easy to remove by median filtering. The advantage of the proposed technique is clear when it is compared to other diffusion algorithms and the well-known adaptive weighted median filtering (AWMF) scheme in both simulation and real medical ultrasound images.

Keywords and phrases

speckle noisemedian filteranisotropic diffusionimage decimation

Authors’ Affiliations

(1)
Department of Electrical & Computer Engineering, University of Connecticut

Copyright

© Yang and Fox 2004