摘要
在小波去噪的方法中,应用最广泛的是Donoho阈值法,但由于其阈值的单一性,使它不能在每级尺度上将信号与噪声做最大分离,去噪效果并不理想。通过分析Donoho硬阈值和软阈值方法的特点,提出了一种黄金分割法,这种方法结合了硬阈值和软阈值方法各自的优点。仿真去噪结果表明,这种改进的小波阈值方法能够得到更好的去噪效果,信号的信噪比得到了进一步提高。
Among the denoising methods, Donoho＇s threshold method is most widely applied. Due to its single threshold value, however, it cannot separate signal from noise completely at each step of scale and hence its denoising effect is not satisfactory. By comparatively analyzing Donoho＇s hard threshold and soft threshold method, this paper puts forwards a golden section method, which combines the advantages of both methods. The simulation denoising result shows that better denoising effect can be achieved by this modified wavelet threshold method, and the signal-to-noise ratio can be improved.
出处
《物探与化探》
CAS
CSCD
2006年第3期254-257,共4页
Geophysical and Geochemical Exploration
关键词
小波阈值去噪
硬阈值
软阈值
黄金分割法
wavelet threshold denoising
hard threshold
soft threshold
golden section method
