CN202814413U - High-precision calibration plate for calibrating camera parameters - Google Patents
High-precision calibration plate for calibrating camera parameters Download PDFInfo
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- CN202814413U CN202814413U CN 201220500057 CN201220500057U CN202814413U CN 202814413 U CN202814413 U CN 202814413U CN 201220500057 CN201220500057 CN 201220500057 CN 201220500057 U CN201220500057 U CN 201220500057U CN 202814413 U CN202814413 U CN 202814413U
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Abstract
The utility model belongs to the technical field of observing and controlling, and particularly relates to a high-precision calibration plate for calibrating camera parameters and a manufacture method of the high-precision calibration plate, aiming at solving the problems of not high positional accuracy and less calibration plate size in the prior art. The calibration plate comprises a calibration base plate (1), calibration points (2) and reinforcing ribs (3), wherein the calibration base plate (1) is a square metal thin plate, the calibration points (2) are evenly arranged at the front side of the calibration base plate (1) to form a calibration point array (2); and the reinforcing ribs (3) are arranged at the back side of the base plate of the calibration plate. The external enveloping size of the calibration plate is 500mm*500mm, and adopts a 7*7 dot matrix, the diameter of each calibration point (2) is 20mm, the distance among the calibration points (2) is 68mm, and the actual measurement shows that the calibration semi-flatness is 0.01mm, the point location distance error is less than +/-0.015mm, and the roundness error is less than 0.01mm. The problems of not high positional accuracy and less calibration plate size in the prior art can be solved.
Description
Technical field
The utility model belongs to the observation and control technology field, is specifically related to a kind of high-precision calibrating plate of demarcating for camera parameter and preparation method thereof.
Background technology
In machine vision and photogrammetric field, the major equipment of finishing the measurement task is camera, and it is the prerequisite of finishing the measurement task that its parameter is carried out accurate calibration.Camera calibration model based on the plane reference plate has good portability, and the demarcation flow process is simple, but the advantages such as on-site proving, so more and more paid attention to based on the camera calibration technology of plane reference plate, use also more and more wider.
At present, the scaling board of demarcating for camera parameter mainly contains following several method for making: papery is printed; Coating film on glass; The plastics air brushing; Liquid crystal material; Stupalith etc.Wherein most popular is that the mode of printing obtains, and the scaling board pattern that prints is pasted on the substrate of surfacing, the positional accuracy that printing type obtains is general ± and 0.1mm.Scaling board precision in range of small that coating film on glass technique is made is higher, can obtain micron dimension, large scale scope cost of manufacture is very high, and because glass surface is mirror-reflection, can affect scaling board picture quality because of the surrounding environment spurious reflections, can't extract monumented point 2 when serious.Plastics air brushing method for making is simple, and precision is lower, is generally ± 0.1mm, and has equally the shortcoming of mirror-reflection.The scaling board pattern that uses liquid crystal panel to make can arrange flexibly, have stronger versatility, but precision is lower, is generally ± 0.1mm.Stupalith can be made the scaling board of degree of precision, and the surface has preferably environmental suitability for diffuse reflection, but only limit to small size (be generally 100mm * 100mm), very high for the large scale cost of manufacture, and pottery belongs to hard brittle material, the use inconvenience.
Summary of the invention
The purpose of this utility model is to solve the not high and less problem of scaling board size of positional accuracy in the prior art, proposes a kind of high-precision calibrating plate for the camera parameter demarcation and preparation method thereof.
The utility model is achieved in that
A kind of high-precision calibrating plate for the camera parameter demarcation comprises scaling board substrate, monumented point and reinforcement, and the scaling board substrate is square-shaped metal sheeting, evenly is provided with monumented point in the scaling board substrate front side, forms the monumented point array; At the scaling board substrate back reinforcement is installed.
Aforesaid scaling board substrate is made by duralumin.
In the aforesaid monumented point array, the accuracy of contiguous tokens point geometry center distance in ± 0.02mm scope, monumented point circularity φ 0.01mm.
The material of aforesaid reinforcement is metal.
The material of aforesaid reinforcement is duralumin.
Aforesaid reinforcement has four, is " rice " font.
Aforesaid scaling board external envelope size 500mm * 500mm adopts 7 * 7 dot matrix, monumented point diameter 20mm, and spacing 68mm demarcates half-plane degree 0.01mm, and some column pitch error is less than ± 0.015mm, and deviation from circular from is less than 0.01mm.
The beneficial effects of the utility model are:
The external envelope size 500mm * 500mm of scaling board adopts 7 * 7 dot matrix, monumented point 2 diameter 20mm, and spacing 68mm demarcates half-plane degree 0.01mm through actual measurement, and some column pitch error is less than ± 0.015mm, and deviation from circular from is less than 0.01mm.Solved the not high and less problem of scaling board size of positional accuracy in the prior art.The scaling board that utilizes the method to make is demarcated camera parameter, compares with the scaling board calibration result that adopts plastic-blasting method processing, and the former result of re-projection error is 0.18pix, and the latter is 0.58pix, and stated accuracy improves more than 3 times.Carry out actual measurement experiment, camera is far away according to target 2m, target length 1m, and the former measuring error 0.6mm, latter's measuring error 2.1mm, measuring accuracy improves more than 3 times.
Description of drawings
Fig. 1 is the structural representation in a kind of high-precision calibrating plate front of demarcating for camera parameter of the present utility model;
Fig. 2 is the structural representation of a kind of high-precision calibrating plate reverse side of demarcating for camera parameter of the present utility model;
Among the figure, 1. scaling board substrate, 2. monumented point, 3. reinforcement.
Embodiment
Below in conjunction with drawings and Examples a kind of high-precision calibrating plate of demarcating for camera parameter of the present utility model is introduced:
As shown in Figure 1, 2, a kind of high-precision calibrating plate for the camera parameter demarcation comprises scaling board substrate 1, monumented point 2 and reinforcement 3, and scaling board substrate 1 is square-shaped metal sheeting, take duralumin as best.Evenly be provided with monumented point 2 in scaling board substrate 1 front, form the monumented point array, contiguous tokens is put 2 geometric center spacings and is selected according to actual needs, and contiguous tokens is put 2 geometric center spacing accuracies in ± 0.02mm scope, monumented point 2 circularity φ 0.01mm.At the scaling board substrate back reinforcement 3 is installed, the material of reinforcement 3 is metal, can adopt the material identical or different with scaling board substrate 1; The shape of reinforcement 3 is selected according to actual needs, and in the present embodiment, reinforcement 3 has four, is " rice " font.In the present embodiment, scaling board external envelope size 500mm * 500mm adopts 7 * 7 dot matrix, monumented point 2 diameter 20mm, and spacing 68mm demarcates half-plane degree 0.01mm through actual measurement, and some column pitch error is less than ± 0.015mm, and deviation from circular from is less than 0.01mm.
By adopting reinforcement 3, both alleviated scaling board weight, again unlikely deforming.
The external envelope size 500mm * 500mm of high precision plane scaling board of the present utility model adopts 7 * 7 dot matrix, monumented point 2 diameter 20mm, spacing 68mm, demarcate half-plane degree 0.01mm through actual measurement, some column pitch error is less than ± 0.015mm, and deviation from circular from is less than 0.01mm.Solved the not high and less problem of scaling board size of positional accuracy in the prior art.The scaling board that utilizes the method to make is demarcated camera parameter, compares with the scaling board calibration result that adopts plastic-blasting method processing, and the former result of re-projection error is 0.18pix, and the latter is 0.58pix, and stated accuracy improves more than 3 times.Carry out actual measurement experiment, camera is far away according to target 2m, target length 1m, and the former measuring error 0.6mm, latter's measuring error 2.1mm, measuring accuracy improves more than 3 times.
Claims (7)
1. one kind is used for the high-precision calibrating plate that camera parameter is demarcated, comprise scaling board substrate (1), monumented point (2) and reinforcement (3), scaling board substrate (1) is square-shaped metal sheeting, evenly is provided with monumented point (2) in scaling board substrate (1) front, forms monumented point (2) array; At the scaling board substrate back reinforcement (3) is installed.
2. a kind of high-precision calibrating plate of demarcating for camera parameter according to claim 1, it is characterized in that: described scaling board substrate (1) is made by duralumin.
3. a kind of high-precision calibrating plate of demarcating for camera parameter according to claim 1, it is characterized in that: in described monumented point (2) array, contiguous tokens point (2) geometric center spacing accuracy in ± 0.02mm scope, monumented point (2) circularity φ 0.01mm.
4. a kind of high-precision calibrating plate of demarcating for camera parameter according to claim 1, it is characterized in that: the material of described reinforcement (3) is metal.
5. a kind of high-precision calibrating plate of demarcating for camera parameter according to claim 4, it is characterized in that: the material of described reinforcement (3) is duralumin.
6. a kind of high-precision calibrating plate of demarcating for camera parameter according to claim 4, it is characterized in that: described reinforcement (3) has four, is " rice " font.
7. a kind of high-precision calibrating plate of demarcating for camera parameter according to claim 1, it is characterized in that: described scaling board external envelope size 500mm * 500mm, adopt 7 * 7 dot matrix, monumented point (2) diameter 20mm, spacing 68mm, demarcate half-plane degree 0.01mm, some column pitch error is less than ± 0.015mm, and deviation from circular from is less than 0.01mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220500057 CN202814413U (en) | 2012-09-28 | 2012-09-28 | High-precision calibration plate for calibrating camera parameters |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220500057 CN202814413U (en) | 2012-09-28 | 2012-09-28 | High-precision calibration plate for calibrating camera parameters |
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| CN202814413U true CN202814413U (en) | 2013-03-20 |
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| CN 201220500057 Expired - Lifetime CN202814413U (en) | 2012-09-28 | 2012-09-28 | High-precision calibration plate for calibrating camera parameters |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697907A (en) * | 2012-09-28 | 2014-04-02 | 北京航天计量测试技术研究所 | High-precision calibration plate for camera parameter calibration and manufacturing method thereof |
| CN105423923A (en) * | 2015-12-31 | 2016-03-23 | 西南交通大学 | Calibration verification device and calibration verification method for wheel pair external dimension detecting system |
| CN111145273A (en) * | 2020-01-17 | 2020-05-12 | 长沙韶光铬版有限公司 | Manufacturing method of ceramic calibration plate substrate |
| CN111630851A (en) * | 2018-10-10 | 2020-09-04 | 深圳配天智能技术研究院有限公司 | Camera calibration device, system and method and device with storage function |
| CN111739107B (en) * | 2020-08-26 | 2020-11-13 | 杭州利珀科技有限公司 | Calibration auxiliary device, calibration system and calibration method |
-
2012
- 2012-09-28 CN CN 201220500057 patent/CN202814413U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697907A (en) * | 2012-09-28 | 2014-04-02 | 北京航天计量测试技术研究所 | High-precision calibration plate for camera parameter calibration and manufacturing method thereof |
| CN103697907B (en) * | 2012-09-28 | 2016-11-23 | 北京航天计量测试技术研究所 | A kind of high-precision calibrating plate for camera parameter demarcation and preparation method thereof |
| CN105423923A (en) * | 2015-12-31 | 2016-03-23 | 西南交通大学 | Calibration verification device and calibration verification method for wheel pair external dimension detecting system |
| CN105423923B (en) * | 2015-12-31 | 2018-10-16 | 西南交通大学 | A kind of take turns demarcates verification method to shape size detecting system |
| CN111630851A (en) * | 2018-10-10 | 2020-09-04 | 深圳配天智能技术研究院有限公司 | Camera calibration device, system and method and device with storage function |
| CN111145273A (en) * | 2020-01-17 | 2020-05-12 | 长沙韶光铬版有限公司 | Manufacturing method of ceramic calibration plate substrate |
| CN111739107B (en) * | 2020-08-26 | 2020-11-13 | 杭州利珀科技有限公司 | Calibration auxiliary device, calibration system and calibration method |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130320 |
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| CX01 | Expiry of patent term |