imshowのオプションにXDataとYDataを付けて重ね合わせてみてはいかがでしょうか。
imshow('peppers.png')
hold on
img1 = imread('coins.png');
xoffset = 50;
yoffset = 70;
imshow(img1, 'XData', [xoffset xoffset+size(img1, 2)], 'YData', [yoffset yoffset+size(img1, 1)])
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