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Figure 6: Visualization of the region of interest for the points p1 and p2 for the Failure B2 data set. (a) Candidates can be chosen from the red regions and must be below the black line. (b) Not all candidates will give rise to a proper convex hull for the first four points. All invalid candidates are masked out in light grey.
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Figure 7:Closeup of the neighborhood of the fifth point that causes Failure B2, it is the lower left one of the two red pixels, but the other at grid-distance (32,32) from the first works also and there are several more candidates not shown in this limited view.