摘要
小波软、硬阈值去噪法及软硬阈值折中法是根据信号与噪声的小波系数特点进行信噪分离的,关键在于对小波系数的处理。但是,噪声的方差越大,信噪分离越困难。提出的改进方法是利用均值逼近的软硬阈值折中法。试验表明这种改进的方法提高了重构信号的信噪比,能够达到较好的去噪效果。
Soft thresholding, hard thresholding and soft-hard thresholding denoising are based on characteristics of the wavelet coefficient separating signal-noise, which lies in the handling of the wavelet coefficient. The improved method proposed in this paper is soft-hard threshoding denoising according to mean approximation. The tests show that the improved method for improving the signal-to-noise ratio of reconfiguration signal can achieve better results.
出处
《信息技术》
2008年第6期124-127,131,共5页
Information Technology
关键词
小波阈值
小波系数
均值逼近
去噪
wavelet threshold
wavelet coefficient
mean approximation
denoishing
