How can I correct this problem :

i want to create the parametric image ,img : image ,T;total number of image sequence,t number of image

 [fn,pn,fi]=uigetfile({'*.cf'})
ffn=horzcat(pn,fn);
global I;
global ffn;
%global rx;
I=dicomread(ffn);
T=size(I,16);%16
% Filtre median pour tout les slices
med=[];
for t=1:T
img(:,:,t)=F_Median(I(:,:,1,t));
end

aux1=img(:,:,t);
    for i=1:size(aux1)
        for j=1:size(aux1)
            somme=0;
            for t=1:T
            aux=cos((2*pi/T) *(t-1))* aux1;
                 Icos(i,j)=somme+aux(i,j);
            end
        end
    end
    for i=1:size(aux1)
        for j=1:size(aux1)
            somme=0;
            for t=1:T
            aux=sin((2*pi/T)*(t-1))*med(i,j,t);
            Isin(i,j)=somme+aux(i,j);
            end

        end
    end
   
% Calcul de l'image d 'amplitude

    for i=1:size(aux1)
        for j=1:size(aux1)
      
                I_amp(i,j)=sgrt((Icos(i,j))^(2)+(Isin(i,j))^(2) );
           
        end
    end
figure();imagesc( I_amp(i,j));
title('Image  I_amp');
colorbar;
colormap('jet');
% Calcul de l'image de phase
  for i=1:size(aux1)
        for j=1:size(aux1)
         
                I_phase(i,j)=arctan(I_sin(i,j)/I_cos(i,j) )                                                                      ;    
         
       end
  end
    figure();imagesc(  I_phase(i,j));

Index exceeds matrix dimensions

Error in fourier (line 63)

Icos(i,j)=somme+aux(i,j);

Answer 1

[Image Analyst]

aux is never defined in your program. Only aux1 is. Maybe you meant aux1?

Also, what is the purpose of somme? It is always zero and never changes, so why have it in the loops?

[Image Analyst]

Not sure if you edited it or I didn't notice at first, but now aux is defined as a scalar:

            aux=cos((2*pi/T) *(t-1))* aux1;
            Icos(i,j)=somme+aux(i,j);            

So it does not have an (i, j) element since it's not a matrix - it's a scalar. Also, you need to fix your use of size() like Star Strider showed.

[dziri halima]

Thanks Image Analyst ,Star Strider

Thank you for your comment, I modified my algorithm but I have another error

The phase image is given by ( Iphase=arctan(Icos(i,j)/Isin(i,j)) )

                                  I_phase=atan⁡2((Isin )/(Icos  ))                                                               

Error using atan2

Not enough input arguments.

Error in parametric (line 107)

I_phase=atan2(Isin/Icos )

[Image Analyst]

When it says that you're using a function improperly, it's always good to look in the help. If you had, you'd have seen that it expected two arguments: a Y and an Y. So it should be

I_phase = atan2(Isin, Icos) ;

Your next error will be when you find out they're null since med is null. You need to think about this whole thing some more.