PURPOSE: To obtain a three-dimensional picture for a scene from plural two-dimensional pictures for the scene by knowing total number of revolution included in a visual point expressed by a pair of different pictures for the scene. CONSTITUTION: A pair of plural (at least fifty) surface polar lines 18 corresponding to a pair of pictures 12, 16 for a scene are determined by virtually setting up specific number of revolution between two visual points of the pictures 12, 16 (process a). A picture element density histogram is prepared along each surface polar line 18 (process b). The sum of rectangular differences of picture element density levels of each histogram for the surface polar lines 18 corresponding to the pictures 12, 16 is determined (process c). The sum of rectangles is determined (process d). In order to obtain a sum of different virtual revolution, the processes (a) to (d) is repeated. The sum of virtual revolution related to the minimum total found out in the process (d) is used (process f). In the process (a), gradient drop search is used for the selection of the sum of virtual revolution.
METHOD FOR EVALUATING THREE-DIMENSIONAL PICTURE