用巴特沃兹低通（高通）、高斯低通（高通）、拉普拉斯高通滤波器对图像进行平滑（锐化）处理，以及Unsharp mask与highboost filtering-Butterworth low-pass (high-pass), Gaussian low-pass (high-pass), Laplacian high-pass filter on the image smoothing (sharpening) processing, and Unsharp mask highboost filtering