摘要
小波分析是一种信号的时间—频率分析方法。而小波包分析是建立在小波分析的理论基础上将信号的高低频成分分开,为信号提供一种更加精细的分析方法。根据被分析信号的特征,自适应地选择相应频带,使之与信号频谱相匹配,从而提高了时-频分辨率。它在信号消噪方面有着显著的效果。本文简述了小波包分析的原理,并基于matlab实现了对二维图像信号进行消噪。
Wavelet analyze is a time- frequence signal analyze method. Then wavelet packet analyze based on wavelet - analyze can divide high frequence and low frequence and is a much more precise method of signal analyze. According to the character of analysed signal, it can self- adapt to choose frequency band and match its frequency spectrum so as to improve the rate of time - frequence differentiate, it shows a prominence effect in denoise. This paper talks about the principle of wavelet packet analyze, and denoise image signal of two dimensions by matlab.
出处
《计算技术与自动化》
2005年第4期99-101,共3页
Computing Technology and Automation
