Open Access

Speckle Reduction and Structure Enhancement by Multichannel Median Boosted Anisotropic Diffusion

EURASIP Journal on Advances in Signal Processing20042004:615075

Received: 31 August 2003

Published: 2 December 2004


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 noise median filter anisotropic diffusion image decimation

Authors’ Affiliations

Department of Electrical & Computer Engineering, University of Connecticut


© Yang and Fox 2004