To wavelet-based noise reduction methods are discussed. First, we improve the traditional spatially selective noise filtration technique proposed by Xu et al. (1994). Second, we introduce a new threshold-based denoising algorithm based on undecimated discrete wavelet transform. Simulations and comparisons are given.
['Quan Pan', 'Lei Zhang', 'Guan-Zhong Dai', 'Hongcai Zhang']
Two denoising methods by wavelet transform