Abstract
In this chapter, a novel despeckling method based on nonsubsampled shearlet transformation and a guided filter is presented. First, a nonsubsampled Laplacian pyramid filter is used to decompose the noisy image thus decomposing the image into high-frequency and low-frequency subbands. Under the direction of the non-sampling filter bank, a highfrequency subband multi-directional decomposition is obtained. Next, based on the threshold function and the correlation of the shearlet coefficients in the transformation domain, an improved threshold shrinkage algorithm is proposed to perform the threshold shrinkage processing on the shearlet coefficients of the high-frequency subbands. Finally, the low-frequency subbands in the transformation domain are processed by the guided filter, and a denoised ultrasonic image is obtained by the inverse transformation of the shearlet. So as to verify the effectiveness of the proposed method, experiments were conducted, and the results were compared to those of other existing denoising filters. These showed the proposed method performs more effectively at denoising and delivers clearer image detail.
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Zhang, J., Cheng, Y. (2020). Nonsubsampled Shearlet and Guided Filter Based Despeckling Method for Medical Ultrasound Images. In: Despeckling Methods for Medical Ultrasound Images. Springer, Singapore. https://doi.org/10.1007/978-981-15-0516-4_6
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DOI: https://doi.org/10.1007/978-981-15-0516-4_6
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