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MatLab trick: read-plot-write an image
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| img = imread('in.png'); | |
| f = figure('visible', 'off'); | |
| imshow(img, 'Border', 'tight'); | |
| hold on; | |
| rectangle('Position', [100, 200, 300, 150], 'EdgeColor', 'y'); | |
| hold off; | |
| F = getframe(gcf); | |
| imwrite(F.cdata, 'out.png'); | |
| close(f); |
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