Patent ID: 7206080
Filing Date: 2007-04-17
Classification: G01B,G01C,G06T,H04N

Abstract:
1. A surface shape measuring apparatus, comprising: a stereo-photographing unit for photographing a measuring object together with a calibration subject placed in the vicinity of the background of said measuring object in stereo and having reference points whose three-dimensional relative positional relation have been determined in advance from a specified direction; a relative position changing part for changing a positional relation between said measuring object and said stereo-photographing unit; a stereo-photographing control part for controlling said relative position changing part to move at least one of said measuring object and said stereo-photographing unit so that said stereo-photographing unit can photograph said measuring object from a plurality of directions; a photographing parameter calculating part for extracting images of said reference points from image data of said calibration subject photographed in stereo by said stereo-photographing unit and obtaining stereo-photographing parameters which include a baseline length, photographing position and tilt of said stereo-photographing unit, in each of the stereo-photographing directions based on the positions of said reference points, with coplanar conditional equations; and a surface shape calculating part for obtaining the surface shape of said measuring object based on said stereo-photographing parameters and an image position of said measuring object in said photographed image data from which said images of the reference points have been extracted.