how to read images from dir and combine images with different size in one image

how to combine multi images in one image with different size and position beside each other in 3 3 matrix , just like a image in link :

Answer 1

[Image Analyst]

See my demo to paste a rectangular image into a larger canvass.

[sina alizadeh]

thanks for your reply , would you please guide me which part of your sample code i can use and help me for my solution

[Image Analyst]

The key lines are at the end:

[x, y] = ginput(1);
% Determine the pasting boundaries.  Clip the image if it goes outside the original image.
r1 = int32(y);
c1 = int32(x);
r2 = r1 + rows2 - 1;
r2 = min([r2 rows]);
c2 = c1 + columns2 - 1;
c2 = min([c2, columns]);
fprintf('The target rectangle is from row %d to row %d, and from column %d to column %d.\n', r1, r2, c1, c2);
plot([c1, c2, c2, c1, c1], [r1, r1, r2, r2, r1], 'r-');
% Paste as much of croppedImage as will fit into the original image.
originalImage(r1:r2, c1:c2, :) = croppedImage(1:(r2-r1+1), 1:(c2-c1+1), :);

[sina alizadeh]

i can't understand :( it's very difficult

[Image Analyst]

How can I help? It's already pretty heavily commented. Basically it gets the image and then needs to determine the rows and columns to paste it in. It needs the top row, the bottom row, the left column, and the right column. But you need to make sure that it does not go outside the target image (canvass) - it has to fit completely inside and if it would go out, you have to limit the rows or columns to the size of the target image.

[sina alizadeh]

tanks for your reply but i don't want to cropped image,my solution is make one image from reading multi images from dir to make a 3 * 3 matrix to show with a different size of each images , i use montage() but can't change the size of the images. and i combine images with imfuse() but can't change the position of images and they overlay to each other

A = imread('1.jpg'); 
for idx = 2 : 12
    B = imread([ num2str(idx) '.jpg']); %// Read in the next image
    B = imresize(B,0.5);
    A = imfuse(A, B, 'blend','Scaling','joint'); %// Fuse and store into A
end
image(A);

how can i create this image ? in the question A1,A2,...A9 are the images from dir with different random size

[Image Analyst]

First do this outside the loop

[rowsA, columnsA, numColorsA] = size(A)

Then, in the loop, instead of this:

B = imresize(B,0.5);

do this to resize B to be the same size as A

B = imresize(B, [rowsA, columnsA]); % No need to pass in numColorsA.