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Accuracy tests for finding corner markers

This is a parametrized test (3x3 different cases that seem to cover it pretty well) that applies both rotating and shifting to a reference exam, and then finds the corner markers on them. The assertion in this test is that the difference between the found corner markers and the 'perfect' corner marker (also calculated) is at most one 1 pixel on each axis. The goal is to establish the accuracy of the find_corner_marker_keypoints function, which can be quantified through this merge request.

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