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Novel calibration plate and calibration method for performing length measurement by using calibration plate

A calibration board and a new type of technology, which are applied to measurement devices, optical devices, instruments, etc., can solve problems such as bottlenecks in optical three-dimensional measurement systems, and achieve the effect of solving errors that cannot be calibrated.

Inactive Publication Date: 2015-11-11
SHENYANG AIRCRAFT CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no corresponding measurement method for this error, resulting in a bottleneck in the application process of the optical three-dimensional measurement system.

Method used

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  • Novel calibration plate and calibration method for performing length measurement by using calibration plate
  • Novel calibration plate and calibration method for performing length measurement by using calibration plate

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Embodiment Construction

[0016] The present invention is applicable not only to a measurement system for single-frame scanning ("single-view") three-dimensional objects, but also to an optical three-dimensional measurement system for determining a measured object from several different images ("multi-view").

[0017] Optical 3D measurement system based on area scanning such as figure 1 As shown, it is mainly composed of a camera 1, a grating projector 2, a tripod 3, and a calibration board.

[0018] where the calibration board, such as figure 2 As shown, including calibration board body 41, calibration board 41 length is 1m, and width is 40cm; On calibration board body 41, some positioning balls are set, positioning balls are A, B, C, D four groups, and every group of positioning balls has 2 A group of positioning balls 42 are symmetrically arranged on both sides of the vertical center line of the calibration plate, and the ball diameter is 50mm, and the distance between the group A positioning ball...

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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 [0001] The invention relates to a method for calibrating length measurement errors for an optical three-dimensional measurement system for area scanning. In particular, a new type of calibration plate is designed, which is specially used for the error calibration of the measurement system. Background technique [0002] An optical 3D measuring system is a general-purpose measuring and testing device that can be configured by the user to suit specific measuring tasks. Their sensors consist of several parts, including one or several image sensors (cameras), one or several projection systems for projecting structured light onto the surface of an object for measurement, or a textured illumination for illuminating any surface present system. Such as: measurement systems based on text projection or Moore text technology, and photogrammetry or scanning systems with area scanning capabilities. [0003] The optical three-dimensional measurement system based on surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
Inventor 刘洪霞张敏
Owner SHENYANG AIRCRAFT CORP
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