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Tricolor raster projection-based Fourier transform three-dimensional measuring method

A technology of Fourier transform and grating projection, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problem of low robustness

Inactive Publication Date: 2011-03-16
HAIAN COUNTY SHENLING ELECTRICAL APPLIANCE MFG +1
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Problems solved by technology

[0007] Technical problem: In view of the problems of spectrum aliasing and low robustness of the phase unwrapping process in the Fourier transform three-dimensional measurement method, the purpose of the present invention is to eliminate the Fourier transform three-dimensional measurement method without affecting the real-time performance of the measurement. influence of spectral aliasing in and improve the accuracy of the phase unwrapping process

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  • Tricolor raster projection-based Fourier transform three-dimensional measuring method
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  • Tricolor raster projection-based Fourier transform three-dimensional measuring method

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Embodiment Construction

[0090] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Under the windows operating system, VC++6.0 is selected as the programming tool to process the deformed raster images collected by the CCD. In this example, a motorcycle fender is used as the measured object, and a relatively accurate full-field absolute phase distribution containing the three-dimensional information of the fender is finally obtained.

[0091] figure 1 is a flow chart of the overall process of the present invention.

[0092] figure 2 It is the three-dimensional measurement system adopted by the present invention. A projector is used to project the three-color grating image to the object to be measured, and a color CCD is used to collect the deformed grating image, which is transmitted to the computer for processing through the graphic card.

[0093] image 3 It is a flow chart of the present invention in step 3 of separati...

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Abstract

The invention discloses a new tricolor raster projection-based Fourier transform three-dimensional measuring method, which mainly aims to accurately work out the phase distribution of raster images, and then obtain the three-dimensional topography information of objects according to the phase distribution. The method is implemented through the steps of setting the gray values of R and G components in a projected raster to follow a sinusoidal variation regulation with two different frequencies, and setting a B component as the average value of the R component or the G component, and forming a color raster image to be projected on an object to be measured; and separating the three components of an acquired deformed color raster image, then processing the separated three gray images, meanwhile, restraining background components and high-frequency noises when the Fourier transform is used to calculate relative phases, and carrying out comparison and calibration on the three gray images with the relative phase values under the two frequencies when the phases are unwrapped so as to achieve the purpose of precisely calculating absolute phases containing height information. Only one raster image is required to be projected in the whole measuring process, therefore, the method of the invention is good in real-time.

Description

technical field [0001] The invention belongs to the field of three-dimensional information reconstruction. Based on the color grating projection, the Fourier transform method is used to analyze the deformed grating image to obtain the relative phase, and the dual-frequency method is used for phase expansion to obtain the process of accurate absolute phase. Background technique [0002] Three-dimensional measurement technology can describe the three-dimensional characteristics of objects and obtain three-dimensional information on the surface of objects. It has a wide range of applications in product inspection and processing control, medical field, cultural relic protection field, aerospace field, cultural field, etc. Among many 3D measurement technologies, optical 3D measurement technology has become the dominant 3D measurement technology due to its non-contact measurement and good real-time performance. [0003] Optical three-dimensional measurement technology is a modern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
Inventor 达飞鹏黄昊
Owner HAIAN COUNTY SHENLING ELECTRICAL APPLIANCE MFG
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