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. Author manuscript; available in PMC: 2014 Aug 18.
Published in final edited form as: Vision Res. 2010 Aug 7;51(7):738–753. doi: 10.1016/j.visres.2010.08.002

Fig. 3.

Fig. 3

The left-hand figure shows the results of all combinations of principal curvatures {−1, 0, 1} in the x direction (horizontal axis) and {−1, 0, 1} in the vertical direction (vertical axis). The plane with principal curvatures {0, 0} lies in the middle and can be used to inspect afterimages, which are similar to the image at 180° from the adapting image. The right-hand figure shows, from left to right and top to bottom: (a) two intersecting ridges, (b) a plateau with a conspicuous white Mach band, (c) a tent ridge, (d) a Gaussian-blurred edge, (e) a sharp edge and (f) an approximation to a Cwm.