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Method for detecting lip defect of PET bottle or bottle parison

A preform and defect technology, applied in the field of machine vision inspection, can solve problems such as false rejection, missed rejection, uneven brightness of photos, etc., and achieve the effect of improving detection accuracy and reducing false rejection

Active Publication Date: 2014-06-25
SHANDONG MINGJIA TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few detection methods in this area. Due to the high speed of the rotating line and the unstable clamping system, the brightness of the photos taken is not uniform. It is difficult to detect different defects stably with general methods, and it is also prone to leakage. Rejection and misrejection phenomenon, urgently need a good detection method to complete the detection of this product

Method used

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  • Method for detecting lip defect of PET bottle or bottle parison

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Embodiment Construction

[0012] The present invention detects the method for bottle mouth defect of PET bottle or preform comprising the following steps:

[0013] Step (1): Collect the image of the mouth of the PET bottle or preform and input it into the computer system.

[0014] Step (2): Extract the image of the bottle mouth ring area, and calculate the gradient in the horizontal direction. The horizontal direction is the tangential direction corresponding to the original image, that is, to find a tangent point in the image of the circular area of ​​the preform ring, and expand it horizontally from the tangent point. Find the gradient in the transverse direction.

[0015] Step (3): Select the Sobel filter to filter the image and calculate the lateral gradient. The calculation of the transverse gradient can be approximately obtained by filtering the extracted preform ring region using the filter in formula (1-1).

[0016] Formula (1-1):

[0017] when When , the Prewitt fi...

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Abstract

The invention discloses a method for detecting the lip defect of a PET bottle or a bottle parison. According to the invention, a lip annular zone image is acquired; the image is transversally expanded at a tangential point; gradients are calculated on a transversal direction; a radial sum of the transversal gradients are adopted as characteristic parameters, such that the lip defect of the PET bottle or the bottle parison can be determined and analyzed. The method is simple, and can be used for detecting problems such as bottle lip knocking, bottle lip damages and cracks. With the method, detection precision is improved, and error rejection rate can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of machine vision detection, and in particular relates to a method for detecting defects in the mouth of PET bottles or preforms. Background technique [0002] At present, in the production process of PET bottles, the preforms are prepared first, and then shaped by a blow molding machine. During the production process, it is necessary to check whether the upper surface of the bottle mouth is damaged to prevent air leakage after capping, resulting in unqualified Taste. There are very few detection methods in this area. Due to the high speed of the rotating line and the unstable clamping system, the brightness of the photos taken is not uniform. It is difficult to detect different defects stably with general methods, and it is also prone to leakage. There is an urgent need for a good detection method to complete the detection of this product due to the phenomenon of rejection and false rejection. Contents o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88
Inventor 王贵锦张树君施陈博国磊姜辉何贝
Owner SHANDONG MINGJIA TECH