A monocular grating structured light vision measurement method and system based on a reference image

Abstract

The present invention relates to a monocular grating structured light vision measurement method and system based on a reference image, comprising the steps of: a. building a monocular structured light three-dimensional measurement system; b. a grating projector projecting a grating stripe pattern and an additional plane to a measured object pattern and speckle pattern, and trigger the industrial camera to collect images at the same time, and obtain the wrapping phase of the two; c. Perform stereo matching on the collected reference object speckle image and the speckle image of the object to be measured, and obtain the reference object and the object to be measured Phase mapping relationship, so as to obtain the fringe order, and then combine the obtained package phase of the object to be measured to obtain the absolute phase value; d. Treat the grating projector as an inverse camera, and the system composed of an industrial camera and a grating projector as a binocular The stereo vision measurement system solves the three-dimensional point cloud of the object to be measured according to the triangulation method combined with the measured absolute phase. In this method, only three patterns are needed to measure the three-dimensional shape of the target, which can be widely used in high-speed and real-time three-dimensional measurement environment.

Description

technical field [0001] The invention relates to the technical field of three-dimensional measurement, in particular to a reference image-based monocular grating structured light vision measurement method and system. Background technique [0002] With recent developments in digital projection, imaging, and processing hardware, optical 3D surface measurement techniques have developed rapidly. Due to the availability of low-cost, fast, non-contact, high-reliability 3D real-time measurement, it is widely used in but not limited to mechanical engineering, industrial monitoring, computer vision, virtual reality, biomedicine and other industrial applications. The real-time 3D measurement technology using fringe projection is the most widely used in optical 3D surface measurement technology, which can be generally divided into two types: Fourier transform profilometry (FTP) and phase shift profilometry (PSP). PSP usually requires at least three fringe images, and its advantages are...

AI Technical Summary

Problems solved by technology

When measuring isolated objects or surfaces with sudden depth discontinuities, spatial unwrapping-based methods fail; temporal phase unwrapping methods rely on additionally wrapped phase maps with different fringe periods to achieve pixel-level phase unwrapping, and the number of required patterns increases, which limits Its application in high-speed measurement; the stereo phase unwrapping method usually requires an additional industrial camera, which increases the hardware cost, in addition, the dual-camera system produces more shadows and has a smaller measurement range

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