摘要
根据小波系数模极大值的特性,提出了去除脉冲噪声的一种新方法.由于脉冲噪声往往造成信号的突变,所以经小波变换后其小波系数易成为模局部极大值.由突变点的模极大值随着小波分解尺度的增大而减小的性质,可采取去除具有此种性质的模极大值的方法去除脉冲噪声.此方法也能很好的去除白噪声,因为白噪声与脉冲噪声的模极大值具有相同的特点.
A new method of impulse de-noising is proposed based on wavelet modulus maxi taurus. Because of its large value the wavelet coefficients of impulse noise are modulus maxi mums which would decrease while wavelet decomposing scale increasing, so we can reduce these modulus maximums to remove impulse noise. This method is also effective for white noise because its modulus maximum has the same character with impulse noise＇s.
出处
《山东理工大学学报（自然科学版）》
CAS
2007年第5期69-72,共4页
Journal of Shandong University of Technology:Natural Science Edition
关键词
脉冲噪声
小波变换
模极大值
去噪
impulse noise
wavelet transform
modulus maximum
denoising
