Jeremy S. De Bonet :

Limits to
Reconstructing Rectangular Polyhedra
Hand-Drawn Wireframe Sketches

Because machine vision is an extremely difficult problem, there is only so much that one can hope to solve with a single problem. Therefore, to make this a tractable problem, some degree of human assistance is necessary in making it possible for the system to successfully recover the desired object(s).

But even with these limitations, the system is still very robust.

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