地震数据有损压缩与失真分析
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摘要
文中提出了应用双正交小波变换有损压缩地震数据的方法,该方法具有实现简单、在高压缩比情况下失真小等特点。以信噪比、剩余能量作为评价指标,分析了压缩引起的信号失真。结果表明压缩比在0~31范围内取值时,信噪比较高,剩余能量在99%以上,原始信号与重构信号有很好的相关度。即使在不太理想的情况下,将重构信号用于地震参数快速测定,对震级的计算误差最大为8.6×10-3,震中距的最大计算误差为3.69 km。
This paper presents the seismic data lossy compression method using biorthogonal wavelet transform,which has advantage of easy achievement and small distortion in the case of high compression ratio and so on.The signal distortion caused by compression with the characteristic parameters of seimic events is analyzed.The results show that the calculated maximum magnitude error is 8.6×10-3,and the maximum epicenter distance error is 3.69 km when the compression ratio is in the range of 0~31.
This paper presents the seismic data lossy compression method using biorthogonal wavelet transform,which has advantage of easy achievement and small distortion in the case of high compression ratio and so on.The signal distortion caused by compression with the characteristic parameters of seimic events is analyzed.The results show that the calculated maximum magnitude error is 8.6×10-3,and the maximum epicenter distance error is 3.69 km when the compression ratio is in the range of 0~31.
引文
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[3]李沙白,刘启元,沈立人.宽频带大动态地震压缩数据的一种实时算法[J].地震学报,1994,16(1):111-117.
[4]袁玫,袁文.数据压缩技术及其应用[M].北京:电子工业出版社,1995.
[5]王喜珍,滕云田,高孟潭,等.基于整数小波变换的地震数据压缩[J].地震学报,2004,26(增刊):116-121.
[6]Wood L C.Seismic data compression methods[J].Geophysics,1974,39(8):8 499-525.
[7]陶布曼[美].JPEG20000图像压缩基础、标准和实践[M].魏江力,柏正尧译.北京:电子工业出版社,2004.
[8]Chui C.K.An Introduction to Wavelets[M].Academic Press Limited,1992.
[9]吴琛,周瑞忠.Hilbert—Huang变换在提取地震信号动力特性中的应用[J].地震工程与工程振动,2006,26(5):41-46.
[10]Unser M,Aldroubi A,Eden M.On the asymptotic convergence of B-spline wavelets to Gabor functions[J].IEEE Trans.Information Theroy,1992,38:864-872.
[11]王喜珍.小波变换在地震数据压缩和震相到时拾取中的应用研究[D].北京:中国地震局地球物理研究所,2004.
[12]Shapiro,J.M.Embedded image coding using zerotrees of wavelet coeeficients[J].IEEE Transactions on Signal Processing,1993,41(12):3445-3462.
[13]Creusere,C.D.A newmethod of robust image compression based on the embedded zerotree wavelet algorithm[J].IEEE Transactions on ImageProcessing,1997,6(10):1436-1442.
[14]时振梁,张少泉,赵荣国,等.地震工作手册[M].北京:地震出版社,1990.
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