摘要
基于小波变换的阈值去噪算法,需采用阈值函数对小波系数进行非线性的处理。本文在分析了硬阈值函数和软阈值函数各自特性的基础上,提出了一种新的阈值函数,该阈值函数克服了软、硬阈值函数的缺陷,连续、可导,且减小了偏差,函数中调节因子m可以改变阈值函数的趋向,使阈值函数具有较大的灵活性。仿真结果表明新的阈值函数的可行性及有效性。
Wavelet coefficients need to be processed non-linearly with the help of thresholding function in threshold de-noising algorithm based on wavelet transform.Based on the analysis of hard thresholding function and soft thresholding function on the basis of their features,this paper proposes a new thresholding function,the thresholding function contin-uous,derivatives and reduced deviation.Adjustment factor can change the trend,with great flexibility.Simulation results show the feasibility and effectiveness of the new thresholding function.
出处
《长春理工大学学报（自然科学版）》
2011年第3期176-178,共3页
Journal of Changchun University of Science and Technology(Natural Science Edition)
关键词
小波变换
阈值去噪
阈值函数
wavelet transform
threshold denoising
thresholding function
