
## 4. Silhouettes

1. #### Problem 4.1.

Which visual event surfaces appear on visual hulls of algebraic surfaces?
• #### Problem 4.2.

Can we find equations of visual event surfaces?
• #### Problem 4.3.

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