Three-dimensional measurement method and device based on linear structured light

Abstract

The invention relates to a three-dimensional measurement method based on linear structured light. The three-dimensional measurement method comprises the following steps of: 1, arranging a plane with marking points and marking lines as a target, and vertically placing the plane on a turntable; 2, regulating a laser and a camera, and setting the center of the turntable as an original point of a world coordinate system; 3, continuously shooting the marking points; 4, determining a world coordinate and an image coordinate of each marking point; 5, determining a camera model; 6, scanning a workpiece to be measured; 7, obtaining a two-dimensional image coordinate of a central point of a scanning light bar; 8, calculating a corresponding three-dimensional world system coordinate by using the two-dimensional image coordinate of the central point of the scanning light bar according to the determined camera model, and acquiring point cloud data of the workpiece; and 9, preprocessing the point cloud data and introducing the point cloud data into reverse engineering software, and finishing reestablishment of a workpiece geometric model by curved surface fitting. By the method, the precision requirement on the camera is low; the method is simple; the requirement on camera calibration can be met well; and the method is higher in precision.

Description

technical field [0001] The invention relates to a three-dimensional measurement method based on line structured light to obtain three-dimensional data, and the measurement device. It belongs to the field of non-contact optical detection. Background technique [0002] In recent years, the competition in the world has become increasingly fierce, especially in the industrial field, and the market's requirements for product design have also undergone fundamental changes. The traditional production mode of many varieties and small batches has replaced the traditional production mode of few varieties and large batches. It is required to shorten the product design and production cycle and improve product quality. In addition, in addition to the basic geometric shapes such as plane, sphere and cylinder applicable to the design of product shape, the application of three-dimensional free-form surfaces is also increasing. As a result, it is not easy to directly establish CAD models a...

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Problems solved by technology

[0003] At present, the use of 3D scanning technology to obtain product mathematical models from physical samples and manufacture new products has become a research and application hotspot in CAD / CAM systems. More than 90% of my country's 3D measurement equipment relies on imports, but foreign countries Imported products of this type are very expensive, making it unaffordable for many domestic enterprises

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