Hi; i need help please. I want to multiply the 5 slices i chose from image vol (1) * slices from image vol (3) and (img2 * img4) this program displays as (img2 * img4) , I wan

clear all;
close all;
a='C:\Users\HP_2\Desktop\Nouveau dossier (2)'
% % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % %     
    for p=2:2:4
    jpgfiles=dir(fullfile(a,'\*.nii*'));
    n=numel(jpgfiles(p));
    im=jpgfiles(p).name
    img=niftiinfo(fullfile(a,im));
    Va = niftiread(img);
    Va_prime = mat2gray(Va);%Convertir la matrice en image en niveaux de gris
    [sliceX sliceY sliceZ]=size(Va);
    frontal = Va_prime; % Frontal view
        for i=1:sliceZ
            outslice=frontal(:,:,i);
            outslice=imrotate(outslice,90);
            x(i)=bwarea(outslice);
            y=max(x);
            c=find(x==y);       
        end
   end
% % % % % % % % % % % % % % % % % % % % % % % % % % % % % %
    for p=1:2:3
    jpgfiles=dir(fullfile(a,'\*.nii*'));
    n=numel(jpgfiles(p));
    im=jpgfiles(p).name
    img=niftiinfo(fullfile(a,im));
    Va = niftiread(img);
    Va_prime = mat2gray(Va);%Convertir la matrice en image en niveaux de gris
    [sliceX sliceY sliceZ]=size(Va);
    frontal1 = Va_prime; % Frontal view
        for i=1:sliceZ
            outslice=frontal1(:,:,i);
            outslice=imrotate(outslice,90);   
        end
    end 
   for m=-2:2 
       x=(imrotate(frontal1(:,:,c+m),90)).*(imrotate(frontal(:,:,c+m),90));
       figure,imshow(x);
   end

[Walter Roberson]

Unfortunately you put your question in the title, which is of limited length, so we do not know what you want to do.

Please edit to put your question as text before the code.

[Meriem YOUss]

I want to multiply the 5 slices i chose from image vol (1) * slices from image vol (3) and (img2 * img4) this program displays as (img2 * img4) , I want to display the two multiplications.

[Walter Roberson]

Do you want to use element-by-element multiplication with the .* operator, or do you want to use algebraic matrix multiplication with the * operator?

What difficulty are you facing in reaching your goal?

[Meriem YOUss]

I'm going to make a loop to display the 5 slices multiply from 1st image * 3rd image and the 5 slices multiply from 2nd image * 4th image. the operation I did it works but only displays the 5 slices of (img2 * img4).

Answer 1

[Walter Roberson]

You have

    for p=1:2:3
    jpgfiles=dir(fullfile(a,'\*.nii*'));
    n=numel(jpgfiles(p));
    im=jpgfiles(p).name
    img=niftiinfo(fullfile(a,im));
    Va = niftiread(img);
    Va_prime = mat2gray(Va);%Convertir la matrice en image en niveaux de gris
    [sliceX sliceY sliceZ]=size(Va);
    frontal1 = Va_prime; % Frontal view
        for i=1:sliceZ
            outslice=frontal1(:,:,i);
            outslice=imrotate(outslice,90);   
        end
    end 
   for m=-2:2 
       x=(imrotate(frontal1(:,:,c+m),90)).*(imrotate(frontal(:,:,c+m),90));
       figure,imshow(x);
   end

Notice that the for p loop ends before the for m loop, and that you have not displayed anything in the for j loop. Your only display is inside the for m loop, which is why you only get 5 outputs and not 5 for each different p value.