ANALYSIS AND IMPROVMENT OF DE-NOISING METHOD FOR WAVELET PACKET
Qu Guoqing 1,2) ;Dang Yamin 3) ;Zhang Chuanyin 3) ; and Su Xiaoqing 2)
1)Shangdong University of Science and Technology, Qingdao 2665102)Shandong University of Technology, Zibo 255049 3)Chinese Academy of Surveying and Mapping, Beijing 100039
Abstract：Wavelet packet analysis is a precise analysis method. There are two key points—choosing threshold and quantitating threshold of wavelet packet coefficients—in wavelet packet denoising method. In this paper, the two points in different methods are analyzed and compared, and the choosing threshold method is improved. Through simulative test, comparing SNR and MSE of original signal and that of signal after denoising to evaluate the effect of those methods, it is proved that the improved method attains good results and is superior to other methods.
