Color response calibration method in colored structure light three-dimensional measurement

Abstract

The invention relates to a color response calibration method in a colored structure light three-dimensional measurement system, which comprises the following steps of: designing an auxiliary calibration image containing six sub-calibration areas, wherein the six sub-calibration areas comprise three basic pure colors, and each pure color has two brightness variation trends; turning the auxiliary calibration image into a white flat plate, carrying out color segmentation on the collected response image, and obtaining six sub-calibration mapping areas; carrying out average operation on the two sub-calibration mapping areas of each basic pure color according to the direction of the same variation trend; taking the result of the average operation as independent variable and ideal response curve as dependent variable for second-order polynomial fit, and obtaining the response function of color response calibration; and finally, according to the response function, calibrating the measurement colored image obtained in colored structure light three-dimensional measurement.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional information reconstruction, and is a technique for improving the accuracy of three-dimensional measurement of color structured light by calibrating response curves of R, G, and B color channels in a three-dimensional measurement system of color structured light. 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 three-dimensional space obje...

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Problems solved by technology

[0008] 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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