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Vision-based multi-depth two-dimensional plane size measurement method

A two-dimensional plane and measurement method technology, applied in the direction of measuring devices, instruments, and optical devices, can solve the problems of high cost of two-dimensional laser sensors, inability to form mapping relationships, and unsuitability for general applications, etc., and achieve simple system structure, Effects of wide operating range and system cost reduction

Inactive Publication Date: 2017-06-20
成都天衡电科科技有限公司
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AI Technical Summary

Problems solved by technology

If the distance from the camera to the measurement plane is unknown, an accurate mapping relationship cannot be formed
At this time, if the method of multi-eye vision is used, the system structure is more complicated, and the cost of the two-dimensional laser sensor is higher, which is not suitable for general applications.

Method used

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  • Vision-based multi-depth two-dimensional plane size measurement method
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Embodiment Construction

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0017] see figure 1 , provide a kind of vision-based multi-depth two-dimensional plane dimension measurement method, it is characterized in that, comprises the following steps:

[0018] Step 1: First, use the calibration board to calibrate the internal parameters of the camera, and obtain a set of external parameters (R, T) on a plane parallel to the measured surface, where R is the rotation matrix parameter, and T is the displacement matrix parameter;

[001...

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Abstract

The invention provides a vision-based multi-depth two-dimensional plane size measurement method which is characterized in that firstly camera internal parameters are calibrated so that plane parameters are obtained; the distance from the camera to a measured object is measured by a laser distance measurement instrument or a displacement sensor according to the perspective projection relation of a pinhole camera model and transmitted to a vision system to be adjusted and then photographing is performed; and the size of the measured object is calculated through image processing. With application of the method, "dynamic calibration" is realized by the system by using vision instead of using the relatively expensive 2D laser sensor, and mapping from the plane to the actual space coordinates is realized by the system according to difference distances from the measured object to the camera so as to complete size measurement.

Description

technical field [0001] The invention relates to the technical field of plane measurement, in particular to a vision-based multi-depth two-dimensional plane size measurement method. Background technique [0002] In the process of using the vision system to measure the two-dimensional dimensions of the workpiece, it is usually necessary to calibrate the measuring plane. One purpose of this process is to find a homogeneous transformation matrix that maps the coordinate system in the rubber plane to the three-dimensional world coordinate system. This relationship can usually be represented by 6 external parameters of the camera, that is, the rotation matrix R includes the rotation angles of the X, Y, and Z axes, and the displacement matrix T includes the displacements in the X, Y, and Z directions. [0003] For the measurement of two-dimensional dimensions, the single-camera vision system can only measure the calibrated plane, that is, the system needs to know the external para...

Claims

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Application Information

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IPC IPC(8): G01B11/00
CPCG01B11/00
Inventor 张宇飞王伟旭杨川李冉
Owner 成都天衡电科科技有限公司
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