function im_big=gtPlaceSubImage(im_small,im_big,topleftx,toplefty)
% GTPLACESUBIMAGE Place a small image within a larger one
% Usage:
%     imbig=gtPlaceSubImage(imsmall,imbig,topleftx,toplefty)
%     imsmall is the image to place
%     imbig is the image to place it into
%     topleftx/y is the location of the top left corner of the placement
% 
%  The final image is the same size as imbig, no matter where the imsmall
%  is placed

% Greg Johnson, September 2006

sz_big=size(im_big);


if (topleftx < 1)
    im_small = im_small(:, 2-topleftx:end);
    topleftx = 1;
elseif (toplefty <1)
    im_small = im_small(2-toplefty:end, :);
    toplefty = 1;
end

sz_small = size(im_small);

im_big(toplefty : toplefty + sz_small(1) - 1, topleftx : topleftx + sz_small(2) - 1) = im_small;
im_big = im_big(1 : sz_big(1), 1 : sz_big(2));

end