Structured light vision method for measuring three-dimensional profile of restricted space

Abstract

The invention belongs to the technical field of measurement, and provides a structured light vision method for measuring the three-dimensional profile of a restricted space. A miniature structured light vision measurement system is used to enter the restricted space and perform three-dimensional profile measurement. The miniature structured light vision measurement system consists of a structured light projector 1, a structured light sensor 2, an imaging control unit, an image acquisition card and a computer, wherein the structured light projector 1 consists of a projector, a telecentric imaging lens 3, an optical fiber image bundle 4 and a projection lens 5; and the structured light sensor 2 consists of the projection lens 5 of the structured light projector 1, an endoscopic camera 6, a plane reflector 7 and a plane reflector 8. The measurement method comprises the following steps that: the computer generates a sinusoidal structured light pattern; the projector, the telecentric imaging lens 3, the optical fiber image bundle 4 and the projection lens 5 project the pattern onto the surface of an object to be measured; the endoscopic camera 6 shoots a modulated structured light stripe image; and the three-dimensional information of the surface of the object to be measured is calculated according to a measurement model. The method realizes the miniaturization of the structured light sensor, and provides an effective technical means for realizing the off-line and on-line measurement of the three-dimensional profile of the restricted space.

Description

technical field [0001] The invention belongs to the field of three-dimensional measurement and relates to a method for visual measurement of three-dimensional shape structured light in a limited space. Background technique [0002] The measurement of the surface topography of three-dimensional objects, also known as reverse engineering in the field of mechanical manufacturing, plays an increasingly important role in modern processing and manufacturing and actual production. As the non-contact detection technology of the surface shape of three-dimensional objects is more and more widely used in scientific research, medical diagnosis, engineering design, trace analysis of criminal investigation scenes, automatic online detection, quality control, robots and many production processes, people's attention to the three-dimensional shape Measurement requirements are getting higher and higher, and its application fields are also expanding. [0003] In the three-dimensional measurem...

AI Technical Summary

Problems solved by technology

Fan Guangguang and others (Fan Guangguang, Li Ruijun, a new type of three-dimensional shape measurement device based on optical fiber image transmission beam, patent number 200520070076.8) developed a new type of three-dimensional shape measurement device, which realized long-distance measurement, but the above-mentioned measurement device The detection head can only be deployed along the axial direction, and cannot measure the inner surface of the vertical axis, and cannot fully meet the requirements of three-dimensional shape measurement in confined spaces

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