How to store a set of matrices ?

Hi,

I want to crop a rectangle from each image in a sequence of images and I want to store the result in a "structure" so that I can call it later on. The problem I have is an overwriting one :

sub_input_i = imcrop(X(:,:,i),rects_input_i(k,:));

rects_input is a matrix of k (number of markers) rows and 4 columns.

Can you please suggest me a solution for that ?

In advance, thank you !

P.S. A part of the code is below :

v = [Rx,Ry];
rects_input = calc_rects(v,CORRSIZE,X(:,:,1));
sub_input0 = imcrop(X(:,:,1),rects_input);

for i = 2:size(X,3)
    clear 'r'
    sub_input=sub_input0;
    Mat_vtemp(1,:) = [Rx(1),Ry(1)];
    for j = -CORRSIZE:CORRSIZE
        for k = 1:length(Rx)
            xtemp = Rx(k)+j;
            ytemp = Ry(k)+j;
            Mat_vtemp(k,:) = [xtemp,ytemp];  
            rects_input_i(k,:) = calc_rects(Mat_vtemp(k,:),CORRSIZE,X(:,:,i)); 
            sub_input_i = imcrop(X(:,:,i),rects_input_i(k,:)); 

            Rx = round(Rx);
            Ry = round(Ry);

            r(Rx(k)+j,Ry(k)+j) = corr2(sub_input,sub_input_i); 
        end
        Mat_sub_input_i(:) = sub_input_i;

        r = abs(r);
        [row(k),col(k)] = find(r==max(max(r)));
        figure, imagesc(X(:,:,i)), colormap gray, axis image
        hold on
        plot(row,col,'*g')
        vopt = [row,col]; % vopt : vecteur optimal
    end
end

where I have the same problem with the output of corr2 (r) that I want to save in a kind of "structure".

Answer 1

[Jan]

What exactly is your problem?

Do you want to use

sub_input{i} = imcrop(X(:,:,i),rects_input_i(k,:));

instead of overwriting sub_input_i in each iteration?

Answer 2

[K BV]

Thanks for your answer !

YES, that's what I want. I wanted to have a "structure" in which I can store/save "sub_input_i" of each marker (= length(Rx)) and for each image (size(X,3)). BTW, sub_input_i is a crop rectangle around a marker in an image.

I tried :

sub_input_i{i,k} = imcrop(X(:,:,i),rects_input_i(k,:));

but I had an error :

Function CORR2 expected its second input, B, to be one of these types:

logical, double, single, uint8, uint16, uint32, int8, int16, int32

[Image Analyst]

Give the correct line of code, and "comment" on the correct "Answer" rather than "Answer"ing your question as a new Answer. The line of code has nothing whatsoever to do with the function corr2().