High-adaptability three-dimensional measuring method based on color structured light

Abstract

The invention discloses a high-adaptability three-dimensional measuring method based on color structured light in a three-dimensional scanning system. The method comprises the following steps of: coding according to the Gray coding principle by use of 6 pure colors; performing sinusoidal modulation of three components R, G and B at the same time to obtain a color grating for projection; designing an auxiliary grating according to the color grating; projecting the designed color grating and auxiliary grating to a measured object; performing superposition operation of the collected two grating deformation diagrams to obtain the reflectivity of each pixel; compensating the grating deformation diagrams according to the reflectivity of each pixel; performing color image division of the compensated grating deformation diagrams; decoding the divided image to obtain corresponding phase period information; graying the compensated grating deformation diagrams and obtaining the wrapped phase value of each pixel by Fourier transform; realizing phase unwrapping according to the decoded phase period information of each pixel; and finally, realizing three-dimensional reconstruction according to the corresponding relationship between the phase and the object height information.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional information reconstruction, and uses fringe projection profilometry for three-dimensional measurement of objects based on color grating projection and Fourier transform method. The whole system involves color projection grating design, image segmentation, phase acquisition and other parts. Background technique [0002] 3D contour detection and reconstruction technology is a branch of computer image processing technology, and a research direction combining computer vision and computer graphics and image processing. It is widely used in the fields of production automation, robot vision, CAD, virtual reality and medical image diagnosis. All have broad application prospects. [0003] Because the grating projection method has the characteristics of completely non-contact detection process, high spatial resolution of data, one-time instant projection to directly realize the shape detection of...

AI Technical Summary

Problems solved by technology

In addition, in terms of phase unwrapping technology, in addition to the traditional gray-scale code method using seven progressively dichotomized black and white fringe images to determine the periodic information of the phase, there are also methods based on edge jump detection and quality map guidance. Generally, the grayscale information of the image is used, and the algorithm implementation is more complicated; and the phase period is determined by using the color information carried by the color code, which not only reduces the number of collected images, but also reduces the complexity of the algorithm. On the premise of not affecting the accuracy, It can improve the dynamic performance of measurement very well, so the application of three-dimensional measurement method based on color-coded raster projection is becoming more and more extensive

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