]>

(a) Two cameras observe a person from different positions. The cameras’ cones are swept around the person’s silhouette

(b) Polygons obtained as the intersection of planar projections of cones in the case of two objects. Visual hull presents the largest volume in which an object can reside. The dark-colored polygons do not contain any objects

Figure 3: Finding the polygons that contain people based on a projection of the person' silhouettes on the planar scene [22].