Fringe projection three-dimensional shape measuring method and device based on parallel four-color channels

Abstract

The invention discloses a fringe projection three-dimensional shape measuring method and device based on parallel four-color channels. The device comprises a computer, a visible light projector, an infrared projector, a 2CCD (charge coupled device) camera and a half-transparent and half-reflecting mirror, the computer is connected with the visible light projector, the infrared projector and the 2CCD camera, the visible light projector and the infrared projector are positioned on the same horizontal plane, the distance between the visible light projector and the half-transparent and half-reflecting mirror is as same as that between the infrared projector and the half-transparent and half-reflecting mirror, the half-transparent and half-reflecting mirror is perpendicular to the horizontal plane, and 45-degree included angles are formed between the half-transparent and half-reflecting mirror and an optical axis of the visible light projector and between the half-transparent and half-reflecting mirror and an optical axis of the infrared projector. According to the method, three fringe images of a red channel, a green channel and a blue channel are combined into a composite color image,the composite color image and an infrared image are projected, the 2CCD camera simultaneously acquires the composite color image and the infrared image, number of projected fringe images is decreased, a three-dimensional shape of an object can be acquired in a one-time measurement manner, and measurement is accelerated.

Description

technical field [0001] The invention relates to the field of three-dimensional stereo vision measurement, in particular to a stripe projection three-dimensional shape measurement method and device based on parallel four-color channels. Background technique [0002] With the development of industrial manufacturing and measurement technology, 3D shape measurement has been widely used in industrial online inspection, virtual reality, cultural relics protection, reverse engineering, biomedicine and other fields. Compared with the traditional technology (using three-coordinate measuring machine to restore the surface contour of the object), optical three-dimensional measurement has the advantages of non-contact, non-destructive, and fast measurement speed. Fringe projection profilometry has become one of the most reliable techniques due to its advantages of high precision, non-scanning, and full-field measurement. Three-dimensional shape data is the core of calculating various a...

AI Technical Summary

Problems solved by technology

But the phase unwrapping method used in the article is only suitable for continuous objects

This makes the system unable to measure discontinuous and large gradient objects, and the measurement system needs to change the hardware structure, which is difficult to operate and is not suitable for promotion

[0004] To sum up, the above measurement methods either cannot measure discontinuous objects, or cannot give good measurement accuracy, or the number of projected fringe images is large, the accuracy is not high, the hardware structure needs to be changed, the operation is difficult, and it is not suitable for promotion

Images