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Multi-scale calibration plate

A calibration board, multi-scale technology, applied in the field of computer vision, can solve the problems of increasing development and maintenance costs, hardware costs, etc., to achieve the effect of saving hardware costs and development and maintenance costs, and avoiding calibration errors

Inactive Publication Date: 2018-04-20
苏州极拓智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the different sizes of field of view, during the calibration process, it is necessary to customize calibration boards of different sizes and matching algorithms, resulting in increased hardware costs, and increased development and maintenance costs
[0004] In addition, the adjustment and calibration of the initial state of the vision system are all manually operated. In addition to repetitive operations and the need for skilled workers to operate, the calibration results often cannot avoid errors caused by human factors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] figure 1 A schematic distribution diagram of a multi-scale calibration plate provided by an embodiment of the present invention is shown. The surface of the multi-scale calibration plate 12 is provided with at least two groups of calibration base points 121 and identifiable codes 122 .

[0037] Each set of calibration base points 121 includes at least three identical calibration points distributed in an orthogonal relationship. In this embodiment, each group of calibration base points is described by taking four calibration points in an orthogonal relationship as an example. In other embodiments of the present invention, each group of calibration base points may also include three or more than four calibration points in an orthogonal relationship formed by connecting the center points of the calibration points at any angle as an example for illustration.

[0038] Define the first group of calibration base points as a group of calibration base points near the edge of t...

Embodiment 2

[0084] Figure 4 A schematic structural diagram of a multi-scale calibration plate provided by the second embodiment of the present invention is shown.

[0085] The multi-scale calibration plate 12 includes: calibration points 121 for calibrating the calibration parameters of the imaging device; codes 122 for identifying the corresponding physical distances, including: code start bit 123 , code end bit 124 and code bit 125 .

[0086] In this embodiment, the image data of the multi-scale calibration plate acquired by imaging devices with three different fields of view is taken as an example for illustration. The field of view of the computer vision system may be of any size, not limited to the three types in this embodiment. A set of calibration base points with the largest area corresponding to different field of view image data is different. For example, in the field of view Rect0, after filtering interference points, edge adhesion areas and non-connected areas, a set of calibr...

Embodiment 3

[0109] Figure 6 A schematic structural diagram of a multi-scale calibration plate provided by the third embodiment of the present invention is shown.

[0110] In this embodiment, each set of calibration base points includes three identical calibration points 121 whose center points are connected to a line in an orthogonal relationship. The calibration points 121 are circles filled with black. The code 122 is set between two calibration points in each group of calibration base points in an orthogonal relationship, and is used to identify the physical distance between the two corresponding calibration points. The codes of each group of calibration base points are the same, and the codes of each group of calibration base points are different from each other. For example, in the field of view Rect0, after filtering the interference points and connected areas, the obtained set of calibration base points with the largest area is A0, B0, and C0, where the codes between A0B0 and A0C...

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Abstract

The invention discloses a multi-scale calibration plate. The surface of the multi-scale calibration plate is provided with at least two groups of calibration base points and identifiable codes. Each group of calibration base points comprises at least three same calibration points in orthogonal relationship distribution; the first group of calibration base points is defined as a group of calibration base points close to the edge of the multi-scale calibration plate, and the second group of calibration base points is defined as a group of calibration base points adjacent to the first group of calibration base points; the area of a single calibration point of the first group of calibration base points is larger than the area of a corresponding calibration point in the second group of calibration base points; and the codes are arranged between the adjacent and nearest two calibration points in each group of calibration base points, and the codes between each group of calibration base points are different. The multi-scale calibration plate is suitable for calibration of imaging devices in different view fields, thereby preventing customization of different sizes of calibration boards and algorithms matched therewith, and saving hardware and development and maintenance cost.

Description

technical field [0001] The invention relates to the technical field of computer vision, in particular to a multi-scale calibration board. Background technique [0002] In the era of Industry 4.0, industrial automation technology has developed rapidly. Machine vision technology is an important direction of industrial automation technology, and it is increasingly playing an important role in social production and life, such as visual monitoring, automatic recognition and measurement of parts, 3D reconstruction, terrain matching, medical image processing, etc. As an important detection method in visual inspection, imaging device, its calibration technology is as important to computer vision as scale is to scale. [0003] In the previous calibration process, due to the different sizes of the products to be tested, the field of view of the imaging device selected by the vision system is different. In order to maximize the detection accuracy and reduce the cost, the appropriate r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80G06T7/11G06T7/155
CPCG06T7/11G06T7/155G06T7/80
Inventor 贾永磊
Owner 苏州极拓智能科技有限公司
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