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介绍了小波去噪的基本理论以及小波阈值法去噪的原理。小波阈值法去噪的关键是阈值的设置和阈值函数的选择。本文归纳了阈值的设置方法和阈值函数的选择方法,并针对图像去噪进行了仿真实验,将一幅混有不同水平高斯白噪声的图像分别进行软、硬阈值函数去噪。实验得出软阈值函数的去噪效果比硬阈值函数的去噪效果好这个结论。
Introduced the basic theory of wavelet denoising and wavelet denoising principle. The key of wavelet denoising is the setting of threshold and the selection of threshold function. This paper summarizes the method of setting the threshold and the selection of the threshold function, and simulates the image denoising. An image mixed with different levels of Gaussian white noise is respectively denoised by soft and hard threshold functions. The experimental results show that the denoising effect of soft threshold function is better than that of hard threshold function.