Scanning arrangement for determining 3D characteristics of an object

摘要

A device for determining 3D properties of a surface 35 comprises a hand-held scanning device which is freely movable relative to the surface and has means such as a laser 29 and a rotating polygonal mirror 40 for projecting a two-dimensional optical pattern onto the surface, and a 2D detector 34 for detecting surface properties. Files of 3D coordinate data from scans of overlapping surface portions of the object are combined into a common set with compensation for any movement of the scanning device relative to the surface between successive scans. The surface portions defined by these scan files are registered by appropriate rotations and translations in a computer 42. The rotations and translations are determined either from the outputs of a gyroscope 51 and an accelerometer 50, or by mathematical processing of the scan data from the surface portions e.g. involving detection and location of common features.