Hon'inbō Hakugen. The upper right thumbnail shows two such cones produced from two silhouette images taken from different viewpoints. The intersection of the two cones is called a visual hull, which is a bounding geometry of the actual 3D object (see the bottom right thumbnail). When the reconstructed geometry is only used for rendering from a different viewpoint, the implicit reconstruction together with rendering can be done using graphics hardware. In two dimensions. A technique used in some modern touchscreen devices employs cameras placed in the corners situated opposite infrared LEDs. The one-dimensional projection (shadow) of objects on the surface may 	Visual hull
13227830	be used to reconstruct the convex hull of the object. Visual hull A visual hull is a geometric entity created by shape-from-silhouette 3D reconstruction technique introduced by A. Laurentini. This technique assumes the foreground object in an image can be separated from the background. Under this assumption, the original image can be thresholded into a foreground/background binary image, which we call a silhouette image. The foreground mask, known as a silhouette, is the 2D projection of the corresponding 3D foreground object. Along with the camera viewing parameters, the silhouette defines a back-projected generalized cone that contains 	Visual hull
13227831	Hon'inbō Hakugen Hon'inbō Hakugen Hon'inbō Hakugen (本因坊伯元, 1726–1754) was a Japanese professional go player, and eighth head of the Hon'inbō house. He reached 6 dan" level. Hon'inbō Hakugen Hon'inbō Hakugen (本因坊伯元, 1726–1754) was a Japanese professional go player, and eighth head of the Hon'inbō house. He reached 6 "dan" level.