S.KALAIVANI, V.SANTHI
A signal dependent noise called speckle is an inherent property of medical ultrasound (US) imaging modality, satellite aperture radar imaging (SAR) and optical coherence tomography (OCT) imaging. This speckle is multiplicative in nature and degrades the resolution, speed and accuracy of all the post processing tasks on the US/SAR/OCT imaging modalities. In this paper, a novel method has been proposed to reduce the speckle by applying a new combinational PDE which exhibits the properties of both second and fourth order partial differential equations (PDEs). The new PDE is applied in Laplacian pyramid domain to achieve better speckle reduction with edge preservation and feature enhancement.
Diffusion; speckle; pyramid; image enhancement