Visual tactile automobile high-reflective surface three-dimensional shape measurement method and system

Abstract

The invention provides a visual tactile automobile high-reflective surface three-dimensional shape measurement method and system, and belongs to the technical field of three-dimensional measurement. Atactile front end used for making contact with a to-be-measured automobile high-reflective surface and a visual rear end used for measuring deformation are built respectively, and a visual tactile automobile high-reflective surface three-dimensional topography measurement system is formed after combination. The opaque coating layer in the touch front end is in contact with a to-be-measured surface and generate deformation, then the projector at the visual rear end projects a coded image to the opaque coating layer to obtain a corresponding projection image, and the point cloud of the to-be-measured high-reflection surface is obtained by calculating the world coordinates of each point on the projection image; and finally, a detection result of the three-dimensional morphology of the to-be-measured high-reflection surface is obtained. The method is comprehensive in measurement, simple in post-processing, high in precision, simple in measurement system installation, low in cost and freeof damage to the measured surface.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional measurement, and particularly proposes a method and system for measuring the three-dimensional shape of a high-reflective surface of an automobile with visual and tactile senses. Background technique [0002] With the development of modern industrial manufacturing technology and measurement technology, the measurement of three-dimensional shape characteristics of large parts has become an important direction in the field of three-dimensional measurement. In the automotive industry, auto parts and vehicle manufacturers pay special attention to how to measure the three-dimensional shape characteristics of products to improve product quality and cope with harsh market competition. Existing three-dimensional measurement mainly includes three-coordinate measuring instrument and measurement system based on vision technology. The former obtains high-precision size information by triggering the ...

AI Technical Summary

Problems solved by technology

However, this technique still has deficiencies

After the auto parts are milled or the whole vehicle is painted, the surface is smoother and the reflectivity is higher, forming a highly reflective area. Overexposure appears in the collected images, resulting in large-scale data holes in the reconstruction results, which affects the measurement effect

One way to solve this problem is to use high dynamic range technology, such as multiple exposures or adding polarizing filters, etc., to increase the dynamic range of the image and reduce overexposure, but this type of technology is more complicated and requires complex post-processing processes Or carefully adjust the relative position of the object and the optical path, increasing the complexity of the hardware and seriously affecting the measurement speed; another method is to spray powder on the highly reflective surface to cover the area with high reflectance, so that the light appears diffuse reflection, and then clean it after measurement The powder on the workpiece may damage the surface of the workpiece, causing additional losses

Images