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. Author manuscript; available in PMC: 2015 Jun 14.
Published in final edited form as: IEEE Trans Image Process. 2015 Feb;24(2):757–769. doi: 10.1109/TIP.2014.2387019

Fig. 5.

Fig. 5

Synthetic images: (a) and (b) are original images and backgrounds. (c) and (d) show spatial gradient or gradient plus noise imposed on the figure or on the background (Image size is 210×300).