Baseline removal front fingerprint raman spectra

Hi everyone, I have to pre-process this row data from the firgerprint region of the raman spectra. How can I remove the baseline? Hope someone can help me.

Thank you.

Answer 1

[Mathieu NOE]

hello

a simple code based on this FEX submission

Raman Spectrum Baseline Removal - File Exchange - MATLAB Central (mathworks.com)

load('ramandata.mat')

x = ramandata(:,1);
y = ramandata(:,2);

[Base, Corrected_y]=baseline(y);

figure
plot(x,y,x,Base,x,Corrected_y);
legend('raw','base','corrected');


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function [Base, Corrected_Spectrum]=baseline(Spectrum)

%Input
%-------
%Spectrum: vector of size (N*1)

%Output
%-------
%Base: Identified Baseline vector of size (N*1)
%Corrected_Spectrum: Corrected Spectrum vector of size (N*1)

l=length(Spectrum);  

lp=ceil(0.5*l);

initial_Spectrum=[ones(lp,1)*Spectrum(1) ; Spectrum ; ones(lp,1)*Spectrum(l)];

l2=length(initial_Spectrum);

S=initial_Spectrum;

n=1;

flag1=0;

while flag1==0
    
n=n+2;
    
i=(n-1)/2;
    
[Baseline, stripping]=peak_stripping(S,n);

A(i)=trapz(S-Baseline);

Stripped_Spectrum{i}=Baseline;

S=Baseline;

if i>3
    if A(i-1)<A(i-2) && A(i-1)<A(i)
        i_min=i-1;
        flag1=1;
    end 
end



end


Base=Stripped_Spectrum{i_min}; 

Corrected_Spectrum=initial_Spectrum-Base; Corrected_Spectrum=Corrected_Spectrum(lp+1:lp+l);

Base=Base(lp+1:lp+l);
end

[Valeria Iazzetta]

Thank you very much, it's very useful for me!

[Mathieu NOE]

as always, my pleasure !