High accuracy calibration for 3d scanning and measuring systems

摘要

A system for calibration of a scanning system, which provides an object (101) for calibration of a known geometry. The object is marked with a pattern of geometric shapes, such as set of equilateral triangles or their vertices. A set of computer programmed elements process photographic images of the object and scanned images of the object to calibrate parameters, including a focal point (145) relationship value for scanning systems which uses an image collector (147), a set of values to correct for distortion of the lens (144), the relative distance between the image collector and the light source (146) and an initial angle to determine light position scanning. The known geometric constraints of the object allow the location of the object and computing 3D X, Y, Z coordinates for those against a constraint that the X, Y, Z coordinates fit onto the surface of the object, the system calibrates parameters pertaining to the relative distance between the image collector and light source and other parameters.