A maximum likelihood filter using non-local information for despeckling of ultrasound images
- 44 Downloads
This work presents a new ultrasound image despeckling method based on the maximum likelihood principle that effectively exploits non-local information for estimating noise-free pixels. First, a new maximum likelihood filter is proposed which uses neighborhood information to despeckle images. For this purpose, the general speckle model is used in the log-likelihood function and despeckled pixels are obtained by maximizing this function. Second, the proposed filter is developed to use non-local information such that the distribution of each noisy pixel is weighted according to the statistical distance between the patch of the noisy pixel and that of the target pixel. Because it is optimally designed for ultrasound images, the Pearson distance is used to measure the statistical distance between the patches. A series of experiments are conducted on three different ultrasound images and one synthetic image. Subjective evaluations show that the proposed method is able to preserve edges and structural details of the image and objective evaluations using equivalent number of looks, natural image quality evaluator, peak signal-to-noise ratio, mean preservation, and structural similarity confirm that the proposed method can achieve superior performance.
KeywordsUltrasound despeckling Maximum likelihood filter Non-local information Speckle noise
- 12.Vanithamani, R., Umamaheswari, G., Ezhilarasi, M.: Modified hybrid median filter for effective speckle reduction in ultrasound images. In: Recent Advances in Networking, VLSI and Signal Processing, pp. 166–171 (2010)Google Scholar
- 15.Vegas-Sánchez-Ferrero, G., Aja-Fernández, S., Martín-Fernández, M., Frangi, A.F., Palencia, C.: Probabilistic-driven oriented speckle reducing anisotropic diffusion with application to cardiac ultrasonic images. In: International Conference on Medical Image Computing and Computer-Assisted Intervention, pp. 518–525. Springer, Berlin (2010)Google Scholar
- 18.Wang, S., Huang, T.Z., Zhao, X.L., Mei, J.J., Huang, J.: Speckle noise removal in ultrasound images by first-and second-order total variation. Numer. Algorithms 1–21 (2017)Google Scholar
- 20.Coupé, P., Hellier, P., Kervrann, C., Barillot, C.: May. Bayesian non local means-based speckle filtering. In: 5th IEEE International Symposium on Biomedical Imaging: From Nano to Macro, 2008. ISBI 2008, pp. 1291–1294. IEEE (2008)Google Scholar