3Weaver J.Fihering noise form images with wavelet transform.Magnetic Resonance in Readar, 1995.
4Donoho D L.De noising via soft thresholding[J].IEEE Trans.Inform.Theory, 1995,41 ( 3 ).
5YA Wu, R.Du.Feature Extraction and Assessment Using Wavelet Packet for Monitoring of Machining Processes[J].Mechanical Systems and Signal Processing, 1996, ( 10 ).