Two-diensional three-frequency dephase measuring method base on color structural light

A measurement method and structured light technology, applied in the direction of measuring devices, photo interpretation, optical devices, etc., can solve the problem that the corresponding relationship of feature points cannot be uniquely determined, so as to avoid measurement errors, overcome low matching accuracy, and code matching Effective and Precise Effects

Inactive Publication Date: 2007-12-19
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

That is to say, in the traditional encoding and one-dimensional phase resolution method, the corresponding relationship of feature points in the left and right photos cannot be uniquely determined, and the corresponding relationship of feature points in the left and right photos must be uniquely determined with the help of other constraints.

Method used

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  • Two-diensional three-frequency dephase measuring method base on color structural light
  • Two-diensional three-frequency dephase measuring method base on color structural light
  • Two-diensional three-frequency dephase measuring method base on color structural light

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Embodiment Construction

[0030] Project the modulated colored light sinusoidal light field to form structured light on the surface of the object, that is, in the X and Y directions of projection, there are three gratings with different frequencies for projection. Project colored surface structured light, which is composed of green light and red light (this can be changed, as long as it is one or two of the three basic colors), among which, the red light shines in the X direction The intensity is sinusoidal distribution, and the light intensity of green light is sinusoidal distribution in the Y direction. Recorded by the left and right cameras, image processing is used to separate images in two two-dimensional directions, the obtained photos are decoded, and the phase shift method is combined to achieve accurate matching of information on spatial coordinate points. Then according to the matching results, the 3D coordinates of the spatial points are obtained by using the calibrated internal and external...

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Abstract

A 2-D three-frequency diphase measuring method based on colored- structure light includes preparing three gratings by complexing different three primary color sine light with three the same frequencies, projecting said gratings on object to be measured, utilizing two the same CCD vide cameras to make shooting for obtaining 24 pieces of pictures, dephasing said pictures to obtain phase values at X and Y direction on each pixel pf each picture and matching two phase values for calculating out 3-D coordinate of each point.

Description

technical field [0001] The invention belongs to the field of reverse engineering measurement, and in particular relates to a two-dimensional three-frequency phase resolution measurement method based on colored structured light. Background technique [0002] The binocular grating projection structured light measurement method is a relatively advanced measurement method at present. It combines the structured light method and the stereo vision method. The projected light beam is projected on the surface of the object through the grating to form structured light. The light is coded into fringe patterns. These deformed fringes are recorded by two CCD cameras at a certain angle to the center of the projector. Each spatial point in the measurement space is encoded according to a series of projected gratings recorded. After decoding and phase calculation, each spatial point is obtained. The encoded information and phase information of a spatial point can be used to determine its spa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00G01B11/03G01B11/25G01C11/08
Inventor 周钢王从军李中伟杜俊贤朱本璋秦大辉张贵姣
Owner HUAZHONG UNIV OF SCI & TECH
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