Authors: Prabhishek Singh, Manoj Diwakar, Shilpi Singh, Sarvesh Kumar, Amrendra Tripathi, Achyut Shankar
Publication date: 2022/3/14
Journal: Biocybernetics and Biomedical Engineering
Publisher: Elsevier
Description: The speckle noise leaves adverse effect on ultrasound images due to which loss of information occurs. Hence, this paper proposes a homomorphic Non-Subsampled Contourlet Transform (NSCT) based ultrasound image despeckling technique using novel thresholding function, bilateral filter, and self-organizing map (SOM). The bilateral filter is utilized over the low-pass NSCT sub-band for speckle component removal and sharp features. To get better noise suppression and edge preservation, a novel thresholding function is proposed and performed over the high-pass NSCT sub-band. In proposed method, Kohonen’s SOM is implemented as post-processing step for deblurring purpose. The significance of proposed scheme is also tested where it was found that using Kohonen’s SOM as post processing works better in compare to without post processing. Experimental outcomes were also evaluated on both real …
Link: https://www.sciencedirect.com/science/article/pii/S0208521622000195