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4. Silhouettes


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      Problem 4.1.

      Which visual event surfaces appear on visual hulls of algebraic surfaces?


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          Problem 4.2.

          Can we find equations of visual event surfaces?


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              Problem 4.3.

              In silhouette reconstruction a duality appears between the visual hull and the convex hull. Is there an algebraic version of this?


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                  Problem 4.4.

                  Can we find the fundamental matrix from silhouettes? If the silhouettes are bounded by algebraic curves are there algebraic constraints on the fundamental matrix?


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                      Problem 4.5.

                      Which curves with cusps come from rims of algebraic surfaces?

                          Cite this as: AimPL: Algebraic vision, available at http://aimpl.org/algvision.