Stereoscopic vision detecting method for measuring three-dimensional morphology on strong reflection surface

A technology of three-dimensional shape and stereo vision, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve problems such as fringe image distortion, and achieve the effect of simple method, high measurement accuracy and low cost

Inactive Publication Date: 2010-04-14
BEIHANG UNIV
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Problems solved by technology

[0005] The object of the present invention is to provide a stereo vision detection method for three-dimensional topography measurement of strongly reflective surfaces, to overcome the problem of fringe image distortion when measuring three-dimensional topography of strongly reflective surfaces by existing non-contact optical active three-dimensional measurement methods

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  • Stereoscopic vision detecting method for measuring three-dimensional morphology on strong reflection surface

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Embodiment Construction

[0032] The present invention is a stereo vision detection method for three-dimensional shape measurement of strongly reflective surfaces. On the basis of the traditional stereo vision detection based on sinusoidal fringe projection, light and dark fringe projection, multiple exposure time image acquisition, and high dynamic range image synthesis are added. And other new technologies to overcome the saturation of the fringe image caused by the strong reflective surface or the fringe image is too dark, and effectively avoid the distortion of the fringe image. The specific implementation steps are as follows,

[0033] (1) Project bright uniform light first, take images with multiple exposure times respectively, and store them in the image sequence PJ in sequence, then project dark uniform light, take images with multiple exposure times respectively, and store them in the image sequence PJ sequentially. Bright uniform light has the same brightness as the brightest part of the brig...

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Abstract

A stereoscopic vision detecting method for measuring three-dimensional morphology on a strong reflection surface is provided. A traditional stereoscopic vision detecting method based on the sine stripe projection comprises steps of stripe projection, image collection, phase resolving, stereoscopic matching and three-dimensional recurrence, and the invention adds new technologies, such as bright-dark stripe projection, image collection in long exposure time, image synthesis within high dynamic range and the like in the steps of the strip projection and the image collection, which overcomes saturated or darker stripe images caused by the strong reflection surface, and can realize the non-contact optical measurement of three-dimensional morphology on the strong reflection surface such as metal. The detecting method has the characteristics of simpleness, flexibility and excellent reliability, and can be used for the optical non-contact measurement of three-dimensional morphology on the strong reflection surface such as metal.

Description

technical field [0001] The invention relates to a stereo vision detection method for three-dimensional shape measurement of strongly reflective surfaces. The method can realize non-contact optical measurement, and can be used for three-dimensional shape measurement of strong reflective surfaces such as metals, and can also be used for objects with large reflectivity changes. Three-dimensional shape measurement of object surface. The invention belongs to the field of optical three-dimensional measurement. Background technique [0002] As a typical non-contact optical active 3D measurement method, the stereo vision detection method based on sinusoidal fringe projection is widely used in many fields such as 3D shape measurement, reverse engineering and quality inspection. However, this active vision method often fails when measuring the three-dimensional topography of highly reflective surfaces such as metals. The main reason is that active vision measurement is based on the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
Inventor 赵慧洁姜宏志李旭东李冬周杰
Owner BEIHANG UNIV
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