Comparison between two layers , and their intersection. The layers are ordered in terms of depth (i.e., corresponds to a smaller depth than ). (a) A set of EPI lines related to constant disparity . The collection of EPI lines carve out a layer . Observe that the complete segmentation of the layer can be defined by a boundary on one viewpoint projected to the remaining frames. (b) modelled by a constant disparity . (c) When the two layers intersect, will occlude as it is modelled by a smaller depth. We define the visible volumes with and .