How to merge between an image object and a surface object?

Given an array of images of some size N,

I display an image from that array using imshow():

I = imshow(ImgArr(n))

Next, I create a surface overlay that displays a heatmap:

H = surface(x,y,v)
set(H,'EdgeAlpha',0,'FaceAlpha',0.5);
colormap('jet')

Now I have two objects: I is the Image object and H is the surface object.

I want to merge between I and H and get an array of merged images that can be displayed using the function montage().

End result should look like this for example (minus the white spaces...) .

Any tips on how to do this?

Note: I want to avoid saving anything to the hard disk except perhaps the final montage.

Answer 1

[Stanislav Steinberg]

The solution I came up with thus far (may not be the most elegant):

k=1;
for/while loop
    % open a new frame
    frame = figure('Visible','off');
    
    % draw whatever it is you draw here
    
    % save frame data into an array
    q = getframe(frame);
    ImgArray(:,:,:,k) = q.cdata;
    k=k+1;
end
fig = figure('Visible', 'on');
montage(ImgArray, 'Size', [num_of_rows num_of_cols]);

Will gladly accept better solutions.