[1] DONOHO D L. De-Noising by soft-Thresholding[J]. IEEE Trans IT, 1995, 41 (3) :613-627.
[2] MALLAT S G. Multifrequency channel decomposition of images and wavelet models[j]. IEEE Trans ASSP,1989, 37(12) :2091-2110.
[3] DAUBECHIES I. The wavelet transform, Time-frequency localization and signal analysis[J]. IEEE Trans Theory, 1995,36:961-1005.