Ridgelet transform is a new signal analysis method that overcomes the defects of wavelet transform in dealing with high-di-mensional signals. Based on the analysis of the theory and the disadvantages of the ridgelet thresholding denoising method, an improved ridgelet thresholding denoising method is proposed. In the new method using SURE threshold, a new thresholding function is constructed. The computer simulation results demonstrated effectiveness of the method in denoising image and preserving the edge simultaneously.%脊波(Ridgelet)变换能够克服小波变换在处理高维信号时的不足,是一种有效处理二维奇异性信号的新方法；在分析传统脊波阀值去噪法的原理和存在的优缺点的基础上,构造了一种新的阈值函数,并结合SURE阈值,提出了一种改进的基于脊波变换的图像去噪方法;并将其应用于受不同强度高斯噪声污染的图像中,实验结果表明该方法对噪声具有良好的噪声拟制作用,能较好地保留图像的细节信息,去噪性能优于常用方法.
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