Three-dimensional coordinate measuring method based on single-camera two-color linear structured light

Abstract

The invention relates to a three-dimensional coordinate measuring method based on single-camera two-color linear structured light, which comprises the steps of calibration of a camera, calibration of a light plane and solution of a three-dimensional coordinate, wherein the calibration of the camera is that: a corresponding relation between a pixel coordinate on an image and a space line forming an image point is established to obtain a continuous mapping inside an entire measuring space; the calibration of the light plane is that: in order to obtain a red-blue linear structured light three-dimensional space equation, a pixel coordinate of a red-blue linear structured light image is obtained on two calibrated images and is converted to a corresponding space three-dimensional coordinate; and the solution of the three-dimensional coordinate is that: a central pixel coordinate of the red-blue linear structured light is searched on a photographed color image, and a space linear equation is established and solved to obtain the space three-dimensional coordinate. Compared with a traditional three-dimensional measuring method, the three-dimensional coordinate measuring method has the advantages of large data collection amount, low cost, small data transmission amount, no need of registration of the data collected by multiple cameras, and capability of eliminating the background interference by a green component in the image so that the measurement is not sensitive to ambient light.

Description

technical field [0001] The invention belongs to the technical field of optical measurement, and relates to a three-dimensional coordinate measurement method based on single-camera two-color line structured light. Background technique [0002] Reverse Engineering (Reverse Engineering) refers to the process of reversing the geometric model from the physical sample or model of the product. The main research is how to accurately and efficiently collect complex 3D surface data from physical objects or samples, and then reconstruct CAD solid models, which are widely used in machinery manufacturing, medical and health and other fields. The purpose of three-dimensional scanning measurement is to obtain the three-dimensional space coordinate data of objects, which can usually be divided into contact measurement and non-contact measurement. Contact measurement has low efficiency and complicated operation, and it is difficult to measure objects with complex shapes. Non-contact measure...

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Problems solved by technology

[0003] In view of the above-mentioned state of the art, the object of the present invention is to provide a single-camera two-color line structured light three-dimensional scanning method to solve the problem of small data collection, high cost and data transmission problems of the non-contact measurement line structured light scanning method. The amount of data is large, and registration of data collected by multiple cameras is required

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