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We propose a non-linear mapping function for digital image enhancement in the wavelet domain, which amplifies mid-range coefficients more than small and large coefficients. We derive this function based on a statistical model of the wavelet coefficients. This three-component mixture model describes the coefficients in each subband as a mixture of small,(More)
This paper presents a derivative and integral sliding mode controller in order to handle the stick-slip oscillation of rotary drilling system. The control method has induced integral of tracking error and the derivatives of tracking error are replaced by state variables, the developed controller uses the nonlinear derivative control for suppressing system(More)
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