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A background cluttered image compressed into different resolutions. (a) 96 pixels, (b) 486 pixels, (c) 950 pixels, (d) 3,290 pixels, (e) 6,370 pixels, (f) 17,876 pixels, (g) 40,344 pixels, and (h) 160,884 pixels. As the resolution increases, the cluttering declines and overlapped outlines are separated. However, the recognition of the OI is still not easy at least until the level shown in (e).
