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Adaptive Weighted Minimax-Concave Penalty Based Dictionary Learning for Brain MR Images

机译:基于自适应加权极大极小凹罚的脑MR图像字典学习

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We consider adaptive weighted minimax-concave (WMC) penalty as a generalization of the minimax-concave penalty (MCP) and vector MCP (VMCP). We develop a computationally efficient algorithm for sparse recovery considering the WMC penalty. Our algorithm in turn employs the fast iterative soft-thresholding algorithm (FISTA) but with the key difference that the threshold is adapted from one iteration to the next. The new sparse recovery algorithm when used for dictionary learning has a better representation capability as demonstrated by an application to magnetic resonance image denoising. The denoising performance turns out to be superior to the state-of-the-art techniques considering the standard performance metrics namely peak signal-to-noise ratio (PSNR) and structural similarity index metric (SSIM).
机译:我们将自适应加权最小极大凹(WMC)罚分作为最小极大凹罚(MCP)和矢量MCP(VMCP)的推广。考虑到WMC损失,我们针对稀疏恢复开发了一种计算有效的算法。我们的算法又采用了快速迭代的软阈值算法(FISTA),但关键的区别在于阈值是从一次迭代适应到下一次迭代。新的稀疏恢复算法在用于字典学习时具有更好的表示能力,这在磁共振图像去噪中得到了证明。考虑到标准性能指标,即峰值信噪比(PSNR)和结构相似性指标指标(SSIM),降噪性能优于现有技术。

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