Some examples are innately more complicated than others, e.g. the case where borders intersect with part of the region to be sampled or where X and Y data has holes. Figure shows one example where the camera zoomed in or the subject approached it, leading to the chin breaking some constraints and raising exceptions. For a fully automatic approach which deals with thousands of images like this, a solution must exist in code and not be sought through manual processes, not even rejection of the data instance.
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