What's the best way to assemble this image mosaic?

I have some large image sets. Each set is comprised by 100
images. Each image is 1280*960. Each image has a set of
coordinates, (x1,y1), (x2,y2) which specify the location of
the image. These images form a mosaic of 25 rows * 4
columns, although not a 'perfect' mosaic -- ie there is
some overlapping of each image and its neighbours.

I'd like to form a single composite image, at full
resolution. There is also some myriad annotation graphics
that would go along with this, eg arrows, circles, text,
etc.

As I see it, there's two ways to go about this:

1) Just display all the images in a single axes, along with
all of the annotation objects. Then do a screen capture
using getframe, saveas, or similar.

The problem with this method is my final image resolution
is limited by my screen resolution, which means my final
image is some 4% of the original resolution.

I've tried stuff like:

hf = figure('Units', 'pixels', 'Position', [0 0 25*960
4*1280]);
plot(hf, rand(1,10), rand(1,10))
saveas (hf, 'test.jpg')

But the resulting image is only 1200*900.


2) Preallocate the large image array and use standard
matlab indexing to fill it with the constituent images, eg:

imgSize = (max(y2)-min(y1)+1, max(x2)-min(y1)+1)
big = zeros([imgSize, 3], 'uint8')
for i = 1:numImages
big(y1(i):y2(i), x1(i):x2(i), :) = imgData(:,:,:,i);
end
imwrite(big, 'big.jpg');

But the major disadvantage of this approach is that there's
no way, as far as I know, to include any of the graphical
annotation.

Any thoughts, folks?



.

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