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The method of spike noise removal in the scanning laser microscopic (SLM) image of diamond abrasive grain using wavelet transforms, on which we previously reported [Opt. Commun. 211 (2002) 73], is improved to eliminate spike noise with a small, fixed number of iterations of smoothing. To achieve this improvement, a new way of averaging was attempted; in addition, an accurate method to determine spike...
A real-time wavelet-matched optical correlator is implemented by using four-wave mixing via reflection gratings. Photorefractive crystals BSO with different thickness are used in the experimental set-up. The square modulus of the Fourier transform of the Mexican-hat wavelet has been utilized to implement the wavelet filtering. The edge enhancement property of the wavelet transform is experimentally...
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