中文说明：
使用软阈值、硬阈值和低通滤波的方法对图像去噪，并求信噪比和均方根误差评价效果。
English Description：
The soft threshold, hard threshold and low-pass filter are used to denoise the image, and the signal-to-noise ratio and root mean square error are calculated to evaluate the effect
Soft hard threshold and low pass filter for image denoising
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中文说明：
使用软阈值、硬阈值和低通滤波的方法对图像去噪，并求信噪比和均方根误差评价效果。
English Description：
The soft threshold, hard threshold and low-pass filter are used to denoise the image, and the signal-to-noise ratio and root mean square error are calculated to evaluate the effect