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

A technology of three-dimensional measurement and color response, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of reducing image acquisition, low algorithm complexity, and complex algorithm implementation

Inactive Publication Date: 2012-06-27
SOUTHEAST UNIV
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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

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

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[0050] The specific implementation manners of the present invention will be further described below in conjunction with the drawings. According to the above method, the design of the auxiliary calibration image and the completion of the color response calibration process are realized by using the C++ programming language on the Windows operating system through the VC6.0 platform. We choose the three-color phase-shift method in the three-dimensional measurement of color structured light to measure the white flat panel, and use this as an example to calibrate the color response of the three-color phase-shift method based on the method proposed by the present invention, and compare it with the uncalibrated measurement results. Specific steps are as follows:

[0051] Step 1: Design Auxiliary Calibration Image:

[0052] Step 11: Generate an image with a size of 1024*768 pixels on the VC6.0 platform, take the bottom left pixel as the origin, set the rightward direction as the x-axi...

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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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Application Information

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IPC IPC(8): G01B11/25
Inventor 达飞鹏胡路遥
Owner SOUTHEAST UNIV
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