3D scanning, as the name suggests, is a full range of measurements, determine the three-dimensional coordinates of the measured data. The measuring principle is divided into four aspects: ranging, angular displacement, scanning and orientation. According to the principle of three-dimensional scanning technology research and development of the instrument, including camera type scanner, laser scanner and three measuring machine three measuring instrument.
Photo - type three - dimensional scanner uses a combination of structured light technology, phase measurement technology, computer vision technology, a composite three-dimensional non-contact measurement technology. The principle of this measurement makes it possible to measure the object. The so-called photographic measurement, is similar to the camera to the object in the visual field, different is the camera is the object of two-dimensional images, and the development of the measuring instrument to obtain three-dimensional information of objects. 3D scanner in production line quality control and component parts of the surface shape detection is widely used, which such as metal casting, forging, punching die machining and casting, plastic parts, mold, roll plastic mould, injection mould, stamping steel, wood composite and foam producing goods to be photographed.
At present, the photo - based 3D scanner is developing towards the direction of digital, image and portable.