Curve smoothing in MATLAB

How can I smooth this curve in MATLAB? I have tried smoothdata() with all options but they typically result in a straight line. Same with fit(). How can I get rid of the bumps?

Answer 1

[Star Strider]

One option would be a lowpass filter, assuming that the independent varialb is regularly sampled. First, calculate the Fourier transforrm either using fft or pspectrum and choose the cutoff requency using that information.

imshow(imread('cxr83combi.png'))

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