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Automated optical inspection (AOI)-based bullet apparent defect detection method

A defect detection, bullet technology, used in optical testing flaws/defects, image data processing, instruments, etc.

Inactive Publication Date: 2014-10-29
NINGBO MOSHI OPTOELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned problems in the prior art, the present invention provides an AOI-based bullet apparent defect detection method with reasonable design, automatic detection, reduced manual detection intensity, high detection efficiency, and safety and reliability.

Method used

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  • Automated optical inspection (AOI)-based bullet apparent defect detection method
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  • Automated optical inspection (AOI)-based bullet apparent defect detection method

Examples

Experimental program
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Embodiment

[0053] The AOI-based bullet apparent defect detection method, the specific steps are as follows:

[0054] (1) Use a CCD line array camera to shoot the surface of the bullet, make the bullet rotate at a constant speed along its axis, and rotate the CCD line array camera at least one circle, so as to obtain the initial grayscale image of the bullet surface; among them, the CCD line array camera A strip-shaped LED light source is installed at symmetrical positions on both sides to illuminate the surface of the bullet, and the camera acquires images along the axis of the bullet. The arrangement direction of the strip-shaped LED light source also matches the direction of the bullet axis, so that the side of the bullet facing the camera is fully illuminated , to avoid shadows affecting subsequent image recognition. As a preference, the CCD line scan camera adopts a 7400 pixel line scan camera.

[0055] (2) Due to various factors, some interference will inevitably appear on the init...

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Abstract

The invention discloses an automated optical inspection (AOI)-based bullet apparent defect detection method including (1) using a CCD (charge coupled device) linear array camera to shoot the bullet surface to obtain a bullet surface initial gray level image; (2) sequentially denoising, enhancing and segmenting the initial gray level image for pretreatment to obtain a binaryzation image; (3) performing connected domain labeling processing on the binaryzation image to obtain a pixel dot set of all defects on the bullet surface; (4) respectively extracting the characteristics of each defective area; and (5) comparing the extracted characteristic values with preset defect standard features to determine the type of each defect. The method is based on the automatic optical inspection, designs a whole set of bullet apparent defect detection programs, and through the precision comprehensive image acquisition, fast image processing algorithm and convenient and accurate feature extraction and recognition, complete bullet apparent defect detection can be efficiently and accurately implemented.

Description

technical field [0001] The invention relates to the field of product inspection, in particular to an AOI-based bullet apparent defect detection method. Background technique [0002] As the most basic weapon in modern times, bullet is one of the most important items in war, and its consumption is very huge. Therefore, the link of safe production of bullets and the guarantee of their quality are one of the important criteria to measure the level of a country's military industry. However, due to various reasons in the bullet production process, it is inevitable to cause a lot of damage, scratches, oil stains, etc., so how to ensure the yield rate of bullet production is an important link to ensure the safety of soldiers on the battlefield. For the above reasons, the detection of bullet apparent defects is of great significance. [0003] At present, the domestic detection methods for the apparent defects of bullets are basically using manual detection methods. Obviously, due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/95G06T7/00
Inventor 杨雷尹志强赵泽东陈仕隆吕坤
Owner NINGBO MOSHI OPTOELECTRONICS TECH
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