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High-dynamic performance three-dimensional measurement method based on adaptive grating projection

A grating projection, three-dimensional measurement technology, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of measurement error, phase error, etc., and achieve the effect of simple and fast steps, fast grating adjustment, and accurate adjustment.

Active Publication Date: 2017-05-24
SOUTHEAST UNIV
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Problems solved by technology

[0006] Purpose of the invention: Aiming at the problems of the prior art, the purpose of the present invention is to provide a high dynamic performance three-dimensional measurement method based on adaptive grating projection, which can solve the problem caused by camera saturation by adaptively generating a grating image according to the object to be measured. Phase Error and Measurement Error

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  • High-dynamic performance three-dimensional measurement method based on adaptive grating projection
  • High-dynamic performance three-dimensional measurement method based on adaptive grating projection
  • High-dynamic performance three-dimensional measurement method based on adaptive grating projection

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Under the Windows operating system, Visual Studio is selected as a programming tool to generate gratings, process the deformed gratings collected by the camera, and make corresponding adjustments to the gratings. In this example, a metal workpiece is used as the measured object, and finally a relatively accurate absolute phase distribution containing three-dimensional information is obtained, and three-dimensional data is generated.

[0039] figure 1 It is a flowchart of the whole process of the present invention.

[0040] The measurement range of the present invention is the overlapping portion of the projection area of ​​the projector and the field of view of the camera. When the surface of the object is within the measurement range, grating stripes can be projected onto the object, and the projected fringe images can also be captured by the c...

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Abstract

The invention discloses a high-dynamic performance three-dimensional measurement method based on adaptive grating projection, and the method comprises the steps: setting a saturation threshold value of an image; carrying out the projection of an all-white image for a to-be-measured object, collecting the image through a camera, changing the gray scale of the projection image, generating a proper grating, and enabling the camera image not to be saturate; enabling the projection to sequentially pass through the gratings adjusted for the first time, collecting an image, solving an absolute phase through a phase shift method and a Gray code method, and completing the matching of the camera image coordinates and the projection grating image coordinates of an excessively bright region through the phase; projecting the image, collecting the image through the camera, adjusting the gray scale of the projection image pixel by pixel based on a coordinate matching result, and generating a final adaptive grating map; projecting a finally generated grating map, collecting the image, and solving an absolute phase through the phase shift method and the Gray code method; and calculating the three-dimensional coordinate information of the measured object according to a space intersection method through the calibrated camera parameters and the solved absolute phase. The method finally achieves the precise three-dimensional measurement with the high dynamic performances.

Description

technical field [0001] The invention belongs to the field of three-dimensional information reconstruction, and in particular relates to a three-dimensional measurement method of grating projection with high dynamic performance. Background technique [0002] Optical three-dimensional measurement technology can quickly and accurately obtain three-dimensional data of objects, which can be used for three-dimensional model reconstruction, object surface profile measurement, detection of size and shape parameters in industrial environments, etc., and is widely used in reverse engineering, industrial inspection, virtual reality , cultural relics protection and medical diagnosis and other fields. [0003] Grating projection three-dimensional measurement is an important optical three-dimensional measurement technology. By projecting a sinusoidal grating on the surface of the object, the shape information of the object surface is modulated in the grating, and the CCD camera is used to...

Claims

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Application Information

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IPC IPC(8): G01B11/00
CPCG01B11/005
Inventor 达飞鹏李韶旭饶立
Owner SOUTHEAST UNIV
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