Mirror object measuring device and method based on binocular vision

Abstract

The invention relates to a mirror object measuring device and a method based on binocular vision. According to the device, a computer is connected with a liquid crystal display device and a camera, and the liquid crystal display device is arranged above a measured mirror object. The measuring method comprises steps that: a binocular camera is calibrated, an internal matrix of the binocular camera and a rotating translation matrix between the cameras are acquired, and relative position relations between the liquid crystal display device and the binocular camera are acquired; a sine fringe is generated by the computer, the liquid crystal display device is controlled to project an image of the sine fringe to the measured mirror object, and a virtual image which is formed on a surface of the measured mirror object and is generated by the sine fringe shot by the camera is inputted to the computer; information of the virtual image acquired by the camera is processed by the camera according to the calibrated relative position relations and the internal matrix of the camera to acquire a three-dimensional profile of the surface of the measured mirror object. The mirror object measuring device has a simple structure, can realize non-contact measurement, needs no contact probes in the traditional technology, reduces measurement cost and improves measurement efficiency.

Description

technical field [0001] The invention relates to a contour three-dimensional reconstruction technology, in particular to a device and method for measuring the three-dimensional contour of a specular object surface using a binocular camera. Background technique [0002] With the increase of measurement requirements and the development of photoelectric technology, vision-based non-contact measurement technology has been developed rapidly. The 3D shape visual measurement of objects has a wide range of applications in many fields such as reverse engineering, robot vision, quality inspection, digital medical treatment, cultural relic protection, film and television advertising, and clothing manufacturing. The three-dimensional profile measurement technology of mirror object surface has important application value. In engineering, there are a large number of specular surfaces that need to be measured. For example, in the fields of machinery manufacturing, cultural relics protecti...

AI Technical Summary

Problems solved by technology

How to judge whether an image feature corresponds to a real scene point or a specular reflection of another scene point? This ambiguity poses a serious problem for vision techniques based on feature detection and matching

Secondly, during specular reflection, the reflection direction of the light beam depends on the incident direction and the normal direction of the object surface, which makes it difficult for the image acquisition system to capture the reflected light. Even if the reflected light is captured, the surface shape data of the measured mirror object depends heavily on the object face normal information

As for the measurement of transparent objects, due to the double influence of specular reflection and internal refraction, it becomes particularly difficult

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