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. Author manuscript; available in PMC: 2014 May 7.
Published in final edited form as: IEEE Signal Process Lett. 2012 Sep 5;19(11):745–748. doi: 10.1109/LSP.2012.2217329

Fig. 3.

Fig. 3

Synthetic grayscale test images, original size 256 × 256. Black is at intensity 0, and white is at intensity 255. (a) Checker. (b) Circles.