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Phase target-based optical three-coordinate measuring method

A three-coordinate measurement and target technology, which is applied in the field of optical detection, can solve the problems of small number of marking points and low positioning accuracy of marking points, and achieve the effects of improved accuracy, easy movement and portability, and simple process

Inactive Publication Date: 2009-10-21
SICHUAN UNIV
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Problems solved by technology

[0004] Aiming at the defect that the number of marking points is small and the positioning accuracy of the marking points is not high when the auxiliary target is used, the present invention proposes a phase target

Method used

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  • Phase target-based optical three-coordinate measuring method
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  • Phase target-based optical three-coordinate measuring method

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing, operating principle, the present invention is described in further detail:

[0022] For traditional auxiliary targets such as figure 1 ), the present invention designs such as figure 2 As shown in the phase target, its target surface is a flat-panel liquid crystal display, and an external image input device is connected. Through the image input device, the standard two-dimensional sinusoidal stripes can be displayed on the display screen, such as image 3 shown.

[0023] Its intensity function is the superposition of sinusoidal grating intensity in x and y directions:

[0024]

[0025] where a, b 1 , b 2 are normal numbers respectively; p x ,p y are the fringe periods, respectively; is the corresponding initial phase.

[0026] The intensity function of the calibration target image captured by the camera is:

[0027]

[0028] According to the Fourier transform analysis method of fringe images, through Fo...

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Abstract

The invention discloses a phase target-based optical three-coordinate measuring method, and relates to the field of visual measurement. A measuring system consists of a camera, a computer, and a phase target consisting of a characteristic image screen, a measuring rod and a measuring head. The camera acquires a characteristic image on the characteristic image screen of the phase target; a fringe analysis method is adopted to calculate the phase distribution, the corresponding relation between points on the target screen and pixels of the camera is established, and three-dimensional coordinates of a contact of the measuring head of the target is further determined. When the phase target is used for the optical three-coordinate measurement, compared with an auxiliary target (a conventional target) with more than 3 marking points, the phase target has a more accurate and reliable measuring result due to the greatly increased number of characteristic points and accurate extraction of the characteristic points based on phase calculation. The phase target has the advantages of high measuring accuracy, small size, easy carrying and motion, easy adjustment of the size of the target image screen, and the like.

Description

a technical field [0001] The invention relates to an optical detection technology, in particular to three-dimensional measurement using a phase target, and belongs to the field of advanced optical manufacturing and detection technology. Two technical background [0002] Target technology has a wide range of applications in machine vision, industrial inspection, physical prototyping and other fields. In target production, due to the high production cost of three-dimensional three-dimensional targets and the limited processing accuracy, two-dimensional planar targets that are relatively easy to produce are more commonly used in applications. [0003] In the traditional visual measurement technology, a calibrated camera and an auxiliary target (the auxiliary target can be regarded as a two-dimensional target) can be used for optical measurement. There are more than 3 marking points on the auxiliary target and a measuring point that is in contact with the measured object. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00G01B11/24G01B11/03
Inventor 苏显渝毛先富刘元坤张启灿向立群
Owner SICHUAN UNIV
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