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3 votes
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Noise Reduction - noisy lines

I just used the method suggested in this older DSP.SE post and it seems to work: I did this manually by first loading the image: ...
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3 votes

Is it ok to use MATLAB ''freqs" command for Digital filters?

For discrete-time filters, such as FIR and IIR filters, the appropriate Matlab function is freqz.m. You need to evaluate the frequency response on the unit circle of the complex plane; ...
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2 votes

A problem on FIR filter design given a difference equation

The filter order is the minimum number of (unit) delay elements necessary to implement the filter, or, equivalently, the order of the corresponding transfer function. In the case of causal FIR filters,...
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2 votes

Kalman Filter EM Estimation of Covariances

I think there is a bug in your code. In KalmanFilter(), observation_matrices=H is probably not what we want. By the reference in ...
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2 votes

What Is the Difference between Difference of Gaussian, Laplace of Gaussian, and Mexican Hat Wavelet?

Let's see how DoG approximates LoG for the 2D case (for an image, e.g.). By derivative theorem of convolution (by associativity and commutativity), $$\nabla^2[f(x, y) \ast G(x, y)] = \nabla^2 G(x, y) \...
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2 votes
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Reference for Wiener-Kolmogorov whitening procedure

There's some missing context, but I'm 99.44% sure that the authors are referring to part of the design process for the Wiener (AKA Wiener-Kolmogorov) filter. If they don't actually cite Weiner's and ...
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1 vote

Is it ok to use MATLAB ''freqs" command for Digital filters?

You should use freqz to calculate frequency response of a digital filter and freqs for an analog filter. Given a transfer ...
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