How to remove outliers from a Raman spectrum

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Gaska
Gaska 2020-1-2
评论： Gaska 2020-1-10
I have a Raman spectrum looking like the one below and would like to remove the outliers from it. I tried to remove it using e.g. a function "rmoutliers" but it does not seem to work. How to do it?
Thanks a lot for the answer.
RamanSpectrum_MatlabFQ.png
  1 个评论
Gaska
Gaska 2020-1-2
For example, by using the function: rmoutliers I get this (blue: my spectrum; red: spectrum after rmoutliers function)
The code is:
X=lambda;
Y=intensity;
[B,TF] = rmoutliers(Y,'movmedian',X(200),'SamplePoints',X);
figure;
plot(X,Y,'b-',lambda(~TF),B,'r-');
legend('Input Data','Output Data');
RamanSpectrum_MatlabFQ_1.png

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采纳的回答

Divya Gaddipati
Divya Gaddipati 2020-1-8
You can achieve this using the different methods.
1) Using Basic fitting:
  • Fit a curve using 'polyfit'.
  • Identify outliers that lie outside the tolerance values.
  • Replace the outliers with fitted values.
https://www.mathworks.com/help/matlab/data_analysis/programmatic-fitting.html
2) Curve Fitting Toolbox can also be used to remove outliers from your data,
https://www.mathworks.com/help/curvefit/removing-outliers.html#bt1uahi-1
3) You can also use the following MATLAB Central File Exchange submission,
https://www.mathworks.com/matlabcentral/fileexchange/69649-raman-spectrum-baseline-removal
Hope this helps!

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