CN105043304A - Novel calibration plate and calibration method for performing length measurement by using calibration plate - Google Patents
Novel calibration plate and calibration method for performing length measurement by using calibration plate Download PDFInfo
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- CN105043304A CN105043304A CN201510585127.9A CN201510585127A CN105043304A CN 105043304 A CN105043304 A CN 105043304A CN 201510585127 A CN201510585127 A CN 201510585127A CN 105043304 A CN105043304 A CN 105043304A
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Abstract
The invention relates to a novel calibration plate and a calibration method for performing length measurement by using the calibration plate. According to the structure of the novel calibration plate, a calibration plate body is provided with a plurality of positioning balls; the positioning balls are divided into four groups, wherein each group includes two positioning balls; the positioning balls in the A group are located at two sides of a vertical midline of the calibration plate and are symmetrically arranged; the diameter of the positioning balls in the A group is 50mm; the interval between the positioning balls in the A group is 150mm; the diameter of the positioning balls in the B group is 80mm; the positioning balls in the B group are located obliquely below the outer sides of the positioning balls in the A group; the interval between the positioning balls in the B group is 250mm; the diameter of the positioning balls in the C group is 150mm; the positioning balls in the C group are located at the outer sides of the positioning balls in the B group; the interval between the positioning balls in the C group is 400mm; the diameter of the positioning balls in the D group is 150mm; the positioning balls in the D group are located at the outer sides of the positioning balls in the C group; and the interval between the positioning balls in the D group is 750mm. The calibration method includes the following steps that: the difference of measurement indicating length La between positioning balls in each group and actual dimension between positioning balls in each group of the novel calibration plate, namely a calibration length truth value Lr, is obtained, so that a measurement error E can be obtained; an optical 3D measurement system is adjusted until the error satisfies accuracy requirements, and calibration work can be completed. This method is simple, quick, convenient and practical.
Description
Technical field
The present invention relates to a kind of method that optical three-dimensional measurement system for sector scanning carries out length-measuring error calibration.Particularly devise a kind of novel scaling board, be exclusively used in calibrating for error of this measuring system.
Background technology
Optical three-dimensional measurement system is a kind of general measurement and testing apparatus, can be configured by user, to adapt to specifically measure task.Their sensor is made up of a few part, comprises one or several imageing sensor (camera), one or several optical projection system for being carried out to body surface measuring by structured light projection, or one for illuminating the texture illuminator that any surface exists.As: based on provision projection or the measuring system of mole provision technology, and there is the photogrammetric of sector scanning ability or scanning system.
Based on the optical three-dimensional measurement system of Surface scan, adopt the method for detecting phases of light field, during measurement, structured light (the grating provision of specific coding) is projected examined workpiece surface, the raster image of distortion is by the two or more camera synchronous acquisitions being mutually certain angle, through Digital Image Processing, calculate the three-dimensional point cloud coordinate of pixel in the public vision area of camera.
In optical three-dimensional measurement systematic difference process, likely there are some measuring error, it is generally length-measuring error, the error characteristics of the whole measurement range of measuring system are described by error in length parameter, these error characteristics depend on the superposition of various individual error, as uncorrected systematic error, the alignment error in succession during several measured object images and stochastic error.And way is not measured at present accordingly for this error, cause optical three-dimensional measurement system to there is bottleneck in application process.
Summary of the invention
In order to solve the technical matters of above-mentioned existence, the invention provides a kind of novel scaling board and applying the calibration steps that this scaling board carries out length-measuring error.
The object of the invention is to be achieved through the following technical solutions: a kind of novel scaling board, comprises scaling board body, it is characterized in that: on scaling board body, arrange some place kick, and described place kick is A, B, C, D tetra-groups, often organizing place kick has 2; Described A group place kick is positioned at scaling board median vertical line symmetria bilateralis and arranges, and sphere diameter is the spacing of 50mm, A group place kick is 150mm; Described B group place kick sphere diameter is 80mm, and be positioned at below the outer skew back of A group place kick, the spacing of B group place kick is 250mm; Described C group place kick sphere diameter is 150mm, is positioned at outside the place kick of B group, and the spacing of C group place kick is 400mm; Described D group place kick sphere diameter is 150mm, is positioned at outside the place kick of C group, and the spacing of D group place kick is 750mm.
Described scaling board length is 1m, and width is 40cm.
Apply the calibration steps that described scaling board carries out length-measuring error, step is as follows:
(1) aforementioned novel scaling board is arranged on platform to be measured;
(2) novel location-plate is aimed at camera, by optical grating projection instrument, Projection surveying is carried out in place kick on novel location-plate, during measurement, project structured light is surperficial to examined workpiece, the raster image of distortion is by the two or more camera synchronous acquisitions being mutually certain angle, through Digital Image Processing, calculate the three-dimensional point cloud coordinate of pixel in the public vision area of camera; Utilize data processing software, the corresponding measurement indicating length La often organized between place kick;
(3) physical size between place kick often organized by the measurement indicating length La between often group place kick step (2) obtained and novel location-plate, namely calibrates length true value Lr, does difference, obtain measuring error E; Getting maximal value in 4 groups of data is error amount;
(4) for the measuring error E obtained in step (3), adjustment optical three-dimensional measurement system, until error meets accuracy requirement, completes calibration operation.
Beneficial effect of the present invention: the novel scaling board of the optical three-dimensional measurement system that is exclusively used in that the present invention is arranged, spacing between place kick on scaling board is definite value, the physical size between place kick often organized by the measurement indicating length La that can be obtained by optical three-dimensional measurement system Actual measurement and novel location-plate, namely calibrate length true value Lr and ask poor, obtain measuring error E, i.e. measuring error E=La-Lr; Thus adjustment optical three-dimensional measurement system, error in length is made zero, the calibration of optical three-dimensional measurement system can be realized.This method simple and fast, convenient and practical.There is the problem that error cannot be calibrated in the optical three-dimensional measurement system in the past that solves.
Accompanying drawing explanation
Fig. 1 is the optical three-dimensional measurement system construction drawing based on Surface scan.
Fig. 2 is the novel scaling board structural drawing of the present invention.
Embodiment
Namely the present invention is applicable to the measuring system of single scan (" single-view ") three-dimensional body, is also applicable to the optical three-dimensional measurement system determining measured object from a few width different images (" from various visual angles ").
Based on Surface scan optical three-dimensional measurement system as shown in Figure 1, primarily of camera 1, optical grating projection instrument 2, tripod 3, scaling board composition.
Wherein scaling board, as shown in Figure 2, comprises scaling board body 41, and scaling board 41 length is 1m, and width is 40cm; Scaling board body 41 arranges some place kick, and place kick is A, B, C, D tetra-groups, and often organizing place kick has 2; A group place kick 42 is positioned at scaling board median vertical line symmetria bilateralis and arranges, and sphere diameter is the spacing of 50mm, A group place kick 42 is 150mm; B group place kick 43 sphere diameter is 80mm, and be positioned at below the outer skew back of A group place kick 42, the spacing of B group place kick 43 is 250mm; C group place kick 44 sphere diameter is 150mm, is positioned at outside B group place kick 43, and the spacing of C group place kick 44 is 400mm; D group place kick 45 sphere diameter is 150mm, is positioned at outside C group place kick 44, and the spacing of D group place kick 45 is 750mm.
Application of aforementioned scaling board carries out a calibration steps for length-measuring error, and step is as follows:
(1) aforementioned novel scaling board is arranged in optical three-dimensional measurement system;
(2) novel location-plate is aimed at camera, by optical grating projection instrument, Projection surveying is carried out in place kick on novel location-plate, during measurement, project structured light is surperficial to examined workpiece, the raster image of distortion is by the two or more camera synchronous acquisitions being mutually certain angle, through Digital Image Processing, calculate the three-dimensional point cloud coordinate of pixel in the public vision area of camera; Utilize data processing software, the corresponding measurement indicating length La often organized between place kick;
(3) physical size between place kick often organized by the measurement indicating length La between often group place kick step (2) obtained and novel location-plate, namely calibrates length true value Lr, does difference, obtain measuring error E; Getting maximal value in 4 groups of data is error amount;
(4) for the measuring error E obtained in step (3), adjustment optical three-dimensional measurement system, until error meets accuracy requirement, completes calibration operation.
Claims (3)
1. a novel scaling board, comprises scaling board body, it is characterized in that: on scaling board body, arrange some place kick, and described place kick is A, B, C, D tetra-groups, and often organizing place kick has 2; Described A group place kick is positioned at scaling board median vertical line symmetria bilateralis and arranges, and sphere diameter is the spacing of 50mm, A group place kick is 150mm; Described B group place kick sphere diameter is 80mm, and be positioned at below the outer skew back of A group place kick, the spacing of B group place kick is
250mm; Described C group place kick sphere diameter is 150mm, is positioned at outside the place kick of B group, and the spacing of C group place kick is 400mm; Described D group place kick sphere diameter is 150mm, is positioned at outside the place kick of C group, and the spacing of D group place kick is 750mm.
2. novel scaling board according to claim 1, is characterized in that: described scaling board length is 1m, and width is 40cm.
3. application rights requires that described in 1, scaling board carries out a calibration steps for length-measuring error, and it is characterized in that, step is as follows:
(1) aforementioned novel scaling board is arranged on platform to be measured;
(2) novel location-plate is aimed at camera, by optical grating projection instrument, Projection surveying is carried out in place kick on novel location-plate, during measurement, project structured light is surperficial to examined workpiece, the raster image of distortion is by the two or more camera synchronous acquisitions being mutually certain angle, through Digital Image Processing, calculate the three-dimensional point cloud coordinate of pixel in the public vision area of camera; Utilize data processing software, the corresponding measurement indicating length La often organized between place kick;
(3) physical size between place kick often organized by the measurement indicating length La between often group place kick step (2) obtained and novel location-plate, namely calibrates length true value Lr, does difference, obtain measuring error E; Getting maximal value in 4 groups of data is error amount;
(4) for the measuring error E obtained in step (3), adjustment optical three-dimensional measurement system, until error meets accuracy requirement, completes calibration operation.
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| CN109405736A (en) * | 2018-10-09 | 2019-03-01 | 东莞市北井光控科技有限公司 | Semiconducter IC component size measurement method, device and terminal device |
| WO2019210644A1 (en) * | 2018-05-04 | 2019-11-07 | 苏州玻色智能科技有限公司 | Standard component used for three-dimensional white light scanning device and calibration method therefor |
| CN110702004A (en) * | 2019-09-23 | 2020-01-17 | 深圳市智信精密仪器有限公司 | Calibration block design and inspection method for high-precision calibration splicing of multiple line lasers |
| CN111256591A (en) * | 2020-03-13 | 2020-06-09 | 易思维（杭州）科技有限公司 | External parameter calibration device and method for structured light sensor |
| CN111890255A (en) * | 2020-07-29 | 2020-11-06 | 苏州华兴源创科技股份有限公司 | Crimping method and crimping system |
| CN114326273A (en) * | 2022-03-16 | 2022-04-12 | 成都工业学院 | Projector array positioning device for light field expansion |
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| WO2019210644A1 (en) * | 2018-05-04 | 2019-11-07 | 苏州玻色智能科技有限公司 | Standard component used for three-dimensional white light scanning device and calibration method therefor |
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| CN110702004A (en) * | 2019-09-23 | 2020-01-17 | 深圳市智信精密仪器有限公司 | Calibration block design and inspection method for high-precision calibration splicing of multiple line lasers |
| CN111256591A (en) * | 2020-03-13 | 2020-06-09 | 易思维（杭州）科技有限公司 | External parameter calibration device and method for structured light sensor |
| CN111890255A (en) * | 2020-07-29 | 2020-11-06 | 苏州华兴源创科技股份有限公司 | Crimping method and crimping system |
| CN111890255B (en) * | 2020-07-29 | 2021-10-01 | 苏州华兴源创科技股份有限公司 | Crimping method and crimping system |
| CN114326273A (en) * | 2022-03-16 | 2022-04-12 | 成都工业学院 | Projector array positioning device for light field expansion |
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