secondly , (3,1) biorthogonal spline wavelet was used as the primitive wavelet filter, adopting lifting scheme to build the most superior biorthogonal wavelet filter, and applying the superior biorthogonal wavelet to the multiresolution wavelet edge detection;
For the gray-level image of government document resource,a linear transform is employed to enhance the image contrast. A spatial filter is applied to bate image noise. Based on this preprocessing,the global threshold T2 is calculated by modified Otsu method.
We characterize the wavelet multipliers, as well as the scaling function multipliers and low pass filter multipliers.
For compactly supported gm, n (FIR filter banks) we prove an exponential rate of convergence and derive explicit expressions for the involved constants.
This, in turn, is used for designing local orthogonal bases obtained by unitary transformations of a single prototype filter.
This in turn, is used for designing local orthogonal bases obtained by unitary transformations of a single prototype filter.
The measure for uncertainty is a product of two factors evaluating the frequency selectivity in comparison with the ideal filter and the effective length of the filter in the digital domain, respectively.