【摘要】 在 D.L .Dohono和 I.M.Johnstone提出的多分辨分析小波阈值去噪方法的基础上 ,提出了一种新的阈值函数。仿真试验结果表明 ,采用新的阈值函数的去噪效果无论在视觉效果上 ,还是在信噪比增益上和最小均方误差意义上均优于传统的硬阈值和软阈值。并且 ,与传统的硬阈值和软阈值相比 ,此函数不仅表达式简单 ,易于计算 ,而且具有优越的数学特性 :易于求导 ,有连续的无穷阶导数。因此新阈值函数的更重要的意义在于使信号的自适应去噪成为可能 ,为更充分的发挥小波阈值去噪方法的优越性开辟了广阔的前景。更多还原

【Abstract】 Based on the Multianalysis wavelet threshold denosing method which put forward by D.L.Dohono and I.M.Johnstone, a new threshold function is posed.Simulation experimental results indicate that the denoising method adopting the mew threshold function gives better MSE performance and SNR gains than hard and soft thresholding methods. More important thing lies in,,just because of its advantages of high order continuous derivative over the hard and soft threshold functions,,this new threshold function makes it possible to construct an adaptive wavelet threshold denoising algorithm,and makes it possible to embody the advantages of the wavelet threshold denoising method more fully.更多还原