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I am trying to write MATLAB code for the research paper entitled Echocardiography Image Enhancement Using Adaptive Fractional Order Derivatives.

The two thresholds are given by a=(peak+min(Gmag))/2 and b=(peak + max(Gmag))/2.

Here the peak is given as the 'peak value of the gradient magnitude calculated for every pixel in the image I.' I don't understand what it means and how should I calculate it?

Any help please!

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