p275fig06.24 Left and right eye stereogram inputs are constructed to generate percepts of objects in depth. These percepts include the features of the objects, not only their relative depths, a property that is not realized in some other models of steriopsis.  See the text for details.<BR>||  Sterogram surface percepts: surface lightnesses are segregated in depth (Fand, Grossberg 2009). Contrast algorithms that just compute disparity matches and let computer code build the surface, eg (Marr, Poggio 1974)