The support points are then used to guide the dense stereomatching stage [Fig. 1(h)] in two separate ways. First, they areused to define a slanted plane prior which guides the densematching stage. To this end, ELAS uses Delaunay triangulation to construct a mesh which approximates coarse scene geometry [Fig. 1(g)]. Second, they are aggregated and used to limit thedisparity values evaluated during the dense matching stage. Thisrange is expanded to include immediately neighboring values(±1), which gives an algorithm a chance to recover in case theinitial mesh is incorrect [Figs. 2 and 1(f)].