How to remove outliers from a Raman spectrum

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.

[Gaska]

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');

Answer 1

[Divya Gaddipati]

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!

[Gaska]

Thans a lot for your help!

Best,

Paulina