Self-demarcating system and method for vision detecting system

A visual inspection and self-calibration technology, applied in the field of calibration systems, can solve the problems of poor stability and reliability, the existence of moving parts, slow speed, etc., to achieve good stability, long life, and solve the effect of inaccurate zoom.

Inactive Publication Date: 2009-08-19
上海砺晟光电技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the calibration process can be completed automatically without standard parts, but the disadvantages are slow speed, low efficiency, moving parts, poor stability and reliability

Method used

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  • Self-demarcating system and method for vision detecting system
  • Self-demarcating system and method for vision detecting system
  • Self-demarcating system and method for vision detecting system

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Experimental program
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Effect test

Embodiment 1

[0036] Such as figure 1 As shown, the self-calibration system for the visual inspection system involved in this embodiment includes a CCD camera 1 , a lens 2 , a standard part 3 , a light source 4 , a half mirror 6 and a housing 7 . The lens 2 is directly connected with the camera 1 , placed directly above the test piece 5 , and aimed at the test piece 5 . A half mirror 6 is placed between the lens 2 and the tested object 5, and forms an angle of 45 degrees with the optical axis of the lens 2. A distance from the side of the half mirror 6 is provided with a standard part 3 and a light source 4, wherein the light source 4 and the half mirror 6 are located on different sides of the standard part 3, and the half mirror, the standard part and the light source are three The formed calibration light path is orthogonal to the original measurement light path. All the above-mentioned components are fixed on the casing 7, so as to ensure a strict mutual positional relationship, and at...

Embodiment 2

[0047] Such as Figure 4 As shown, the self-calibration system for the visual inspection system involved in the present embodiment includes a CCD camera 1, a lens 2, a standard part 3, a light source 4, a half-mirror 6 and a housing 7, a plane mirror 8, and the lens 2 and The camera 1 is directly connected, placed directly above the DUT 5 , and aimed at the DUT 5 . A half mirror 6 is placed between the lens 2 and the tested object 5, and forms an angle of 45 degrees with the optical axis of the lens 2. Both the standard part 3 and the light source 4 are arranged beside the lens 2 and the camera 1, and the centerlines of the standard part 3 and the light source 4 are parallel to the optical axes of the lens and the camera, and as close as possible. A flat reflector 8 is placed on the side where the standard part 3 and the light source 4 are arranged on the half mirror 6 . Wherein the standard part 3 is light-transmitting and has regular-shaped graphics on it. The image formed...

Embodiment 3

[0051] The self-calibration method for the visual inspection system involved in this embodiment includes the following steps:

[0052] 1. Adjust the lens 2 to ensure that the camera 1 can obtain a clear image and the size of the field of view, and then keep the lens 2 still;

[0053] 2. Turn on the light source 4, the regular pattern on the standard part is illuminated, and imaged on the CCD image plane of the camera 1 through the half mirror 6 and the lens 2;

[0054] 3. Perform necessary image processing and calculation to obtain the imaging size parameters of the above-mentioned regular graphics in the image coordinate system at the current magnification, and the unit is pixel;

[0055] 4. Comparing the imaging size parameters of the above-mentioned regular graphics with their actual size parameters, the corresponding relationship value (ie equivalent) between the two can be obtained, the unit is length / pixel, and the value is automatically saved in the computer.

[0056] ...

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Abstract

The invention relates to a self-calibration system used for a visual inspection system in the field of precise testing technology and a method. The self-calibration system comprises parts of a CCD camera, a lens, a standard component, a light source, a dichroic mirror, a shell and the like. The lens is directly connected with the camera, put right above a measured piece and directed at the measured piece. A dichroic mirror is arranged between the lens and the measured piece and keeps 45 degrees with the optical axis of the lens. The standard component and the light source are arranged at the side of the dichroic mirror, wherein the light source and the dichroic mirror are respectively arranged at the different sides of the standard component. A calibrated light path formed by the dichroic mirror, the standard piece and the light source is in orthogonal intersection with an original measurement light path. When an object to be measured is within the range of depth of field, the distance between the center of the dichroic mirror and the clear surface of the object to be measured has a unique definite corresponding relation with the distance between the center of the dichroic mirror and a calibration object. Therefore, the embedded standard component can be used for realizing the calibration of the visual inspection system without manual intervention.

Description

technical field [0001] The present invention relates to a calibration system and method in the technical field of detection, in particular to a self-calibration system and method for a visual detection system. Background technique [0002] Component size detection is a routine test item in the machinery manufacturing industry and has the most extensive application requirements. With the continuous progress of computer technology, precision optical technology, image processing and pattern recognition technology, the application of visual inspection system based on computer vision is becoming more and more extensive. [0003] In various visual inspection systems, calibration (also known as calibration) is an extremely critical link, which has a direct impact on detection accuracy and efficiency. At present, there are two main methods for calibration (or calibration) of monocular vision detection systems worldwide: [0004] The first method: physical calibration method. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00
Inventor 赵辉刘伟文陶卫杨金峰宋旭辉
Owner 上海砺晟光电技术有限公司
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