软阈值去噪，硬阈值去噪，半软阈值去噪，并对比这三个的信噪比
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╨í▓¿╕─╜°/3.jpg , 24461
╨í▓¿╕─╜°/7.bmp , 49206
╨í▓¿╕─╜°/Donoho.m , 484
╨í▓¿╕─╜°/MSE.m , 189
╨í▓¿╕─╜°/PSNR.m , 133
╨í▓¿╕─╜°/Untitled2.m , 52
╨í▓¿╕─╜°/den1.m , 735
╨í▓¿╕─╜°/lena_color.png , 476195
╨í▓¿╕─╜°/main1.m , 1753
╨í▓¿╕─╜°/wdenoise.m , 1754