探讨了多小波函数及其预处理方法对探地雷达(ground penetrating radar—GPR)图象去噪性能的影响,在Donoho D L和Johnstone I M提出的小波阈值去噪方法的基础上提出了一个改进的阈值函数,并对实际的GPR图象进行阈值化处理和对比分析,结...探讨了多小波函数及其预处理方法对探地雷达(ground penetrating radar—GPR)图象去噪性能的影响,在Donoho D L和Johnstone I M提出的小波阈值去噪方法的基础上提出了一个改进的阈值函数,并对实际的GPR图象进行阈值化处理和对比分析,结果表明选取合适的预处理方法,采用DGHM和STT多小波对GPR图象去噪可获得比其他方法更好的效果。展开更多
In this paper, we present a quotient space approximation model of multiresolution signal analysis and discuss the properties and characteristics of the model. Then the comparison between wavelet transform and the quot...In this paper, we present a quotient space approximation model of multiresolution signal analysis and discuss the properties and characteristics of the model. Then the comparison between wavelet transform and the quotient space approximation is made. First, when wavelet transform is viewed from the new quotient space approximation perspective, it may help us to gain an insight into the essence of multiresolution signal analysis. Second, from the similarity between wavelet and quotient space approximations, it is possible to transfer the rich wavelet techniques into the latter so that a new way for multiresolution analysis may be found.展开更多
文摘探讨了多小波函数及其预处理方法对探地雷达(ground penetrating radar—GPR)图象去噪性能的影响,在Donoho D L和Johnstone I M提出的小波阈值去噪方法的基础上提出了一个改进的阈值函数,并对实际的GPR图象进行阈值化处理和对比分析,结果表明选取合适的预处理方法,采用DGHM和STT多小波对GPR图象去噪可获得比其他方法更好的效果。
文摘In this paper, we present a quotient space approximation model of multiresolution signal analysis and discuss the properties and characteristics of the model. Then the comparison between wavelet transform and the quotient space approximation is made. First, when wavelet transform is viewed from the new quotient space approximation perspective, it may help us to gain an insight into the essence of multiresolution signal analysis. Second, from the similarity between wavelet and quotient space approximations, it is possible to transfer the rich wavelet techniques into the latter so that a new way for multiresolution analysis may be found.
