MATLAB: Curve fitting on image

crackcrack detectioncurve fitting

I'm working on crack detection on concrete structures, for that i need to do curve fitting along the crack and use extrapolation to find the future status of the crack, but i'm not able to find a way for curve fitting on image part,……thanks!

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John D'Errico's interp_arc from the File Exchange could be adapted to extrapolate.

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MATLAB: Matlab curve fitting tool automation for selection of fit with minimum sse.

You could certainly write your own function by using the gof output of the "fit" function.

Here is an example that shows you how to use the "fit" to see the Goodness of Fit of different methods. You could store the "gof" values in an array and find the max GoF.

function bestFitName = Gof_Finder( x, y )
    Fits = {'poly1', 'poly2', 'poly3', 'exp1'};
      for i=1:numel(Fits)
          [~,GoFs(i)] = fit( x, y,  Fits{i} );
      end
      [~, minIdx] = min([GoFs.sse]);
      bestFitName = Fits{minIdx};
  end

The above function will return the name of the best fit of the data x and y.

MATLAB: Curve Fitting Techniques

fminsearch (and functions that use fminsearch such as John d'Errico's fminsearchbnd, and others on the file exchange) does not need explicit derivatives. As long as you can calculate the curve from your parameters you should be able to run a least-square-type minimization with those tools.

HTH

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Related Solutions

MATLAB: Matlab curve fitting tool automation for selection of fit with minimum sse.

MATLAB: Curve Fitting Techniques

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