KEYWORDS: Image filtering, Ultrasonography, Speckle, Denoising, 3D image processing, 3D image reconstruction, Medical imaging, Image denoising, Image restoration, Digital filtering
It is inevitable that there is speckle noise in ultrasound image. Despeckling is the important process. The original
nonlocal means (NLM) filter can remove speckle noise and protect the texture information effectively when the image
corruption degree is relatively low. But when the noise in the image is strong, NLM will produce fictitious texture
information, which has the disadvantageous influence on its denoising performance. In this paper, a novel nonlocal
means (NLM) filter is proposed. We introduce geometric moments into the NLM filter. Though geometric moments are
not orthogonal moments, it is popular by its concision, and its restoration ability is not yet proved. Results on synthetic
data and real ultrasound image show that the proposed method can get better despeckling performance than other
state-of-the-art method.
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