Skip to main content


You are viewing the new article page. Let us know what you think. Return to old version

Research Article | Open | Published:

Speckle Reduction and Structure Enhancement by Multichannel Median Boosted Anisotropic Diffusion


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.

Author information

Correspondence to Zhi Yang.

Rights and permissions

Reprints and Permissions

About this article

Keywords and phrases

  • speckle noise
  • median filter
  • anisotropic diffusion
  • image decimation