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Modeling Method of Light Stripes on Cylindrical Surface Based on Cross-section Gray Level Energy Distribution

A cross-section gray energy, cylindrical surface technology, applied in measurement devices, optical devices, photogrammetry/video measurement, etc. acquisition and other issues, to meet the needs of large field of view measurement, improve the matching accuracy, and have a good fit.

Active Publication Date: 2017-08-22
DALIAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

If the model is not designed properly, it will easily deviate from the original light strip of the image, reduce the fitting accuracy of the model, cause the fitting effect to be unstable, and cannot obtain accurate results, which will affect the acquisition of two-dimensional information of the image, and then affect the restoration of the three-dimensional feature size

Method used

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  • Modeling Method of Light Stripes on Cylindrical Surface Based on Cross-section Gray Level Energy Distribution
  • Modeling Method of Light Stripes on Cylindrical Surface Based on Cross-section Gray Level Energy Distribution
  • Modeling Method of Light Stripes on Cylindrical Surface Based on Cross-section Gray Level Energy Distribution

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Embodiment Construction

[0047] The specific implementation of the present invention will be further described in detail below regarding the technical solution for large field of view measurement of cylindrical workpieces and the light strip pictures taken by a single camera in the binocular stereo vision measurement system. Since the characteristic information is captured by the CCD camera after the laser light strip is reflected on the surface of the workpiece with a certain shape, the gray energy of the cross-section of the laser light strip captured by the CCD camera is accompanied by the information of the surface shape of the workpiece. Considering the actual space position and the workpiece Surface laser reflection characteristics, analyzing the workpiece shape information attached to the laser light stripe gray energy on the image, can establish the gray energy distribution model of the light stripe section on the image.

[0048] The experimental shooting of the cylindrical workpiece 1 is a cyl...

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Abstract

The invention discloses a method for modeling light strips projected on a cylinder surface based on sectional gray scale energy distribution, which belongs to the measuring field of machine vision, and in particular relates to large visual field measurement in binocular and stereo vision. The method accords with the method for modeling light bars of features on a surface of a cylinder type workpiece to be measured. The method includes: obtaining the relation between image energy and light intensity of reflected light reflected from a cylinder type workpiece by using photoelectric conversion feature of a CCD camera, deriving the relation between the light intensity of the reflected light, laser incidence angle and the shooting angle of the camera by using surface geometrical characteristics of the workpiece to be tested; based on spatial geometrical characteristics, establishing the relation between a spatial distance incidence angle and a sectional position; obtaining a mathematic model which responds to sectional energy of light strips projected on the cylinder surface and geometrical properties by converting a spatial distance and a pixel distance on an image via the camera. The method of the invention performs fitting on laser light strips projected on the surface of the cylinder type workpiece by using a MATLAB fitting toolset, which has excellent fitting level and can provide assessment of the quality of light strips projected on the surface of the cylinder type workpiece to be tested and increase matching precision.

Description

technical field [0001] The invention belongs to the field of computer vision measurement, in particular to a method for establishing a light strip model conforming to the surface characteristics of a cylindrical workpiece to be measured in binocular stereo vision large field of view measurement. Background technique [0002] The measurement principle of binocular stereo vision is to obtain the geometric three-dimensional information of the object according to the two-dimensional image information of the two pictures taken by the binocular camera at the same time. In order to obtain the characteristic size of the object to be measured, it is necessary to project a light strip onto the surface of the object to be measured, use a camera to take a two-dimensional picture, and match the characteristic light strips in the two two-dimensional pictures to restore the three-dimensional feature information on the surface of the object to be measured . Since the characteristic informa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/24G01C11/00G06F17/50
Inventor 贾振元刘巍樊超楠王亮刘阳王灵丽杨景豪徐鹏涛
Owner DALIAN UNIV OF TECH
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