Detection method of PET bottle cap and liquid level

A detection method and bottle cap technology, which are applied in liquid/fluid solid measurement, measurement device, liquid level indicator, etc., can solve the problems of consumer injury, high algorithm complexity, insufficient detection rate, etc., to prevent image jitter, High detection efficiency and simple effect

Active Publication Date: 2012-06-27
SHANDONG MINGJIA TECH
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  • Abstract
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Problems solved by technology

For example, for PET bottles, it is necessary to detect whether the cap and the liquid level are defective. If the cap is not closed properly, foreign matter may be introduced and cause unhealthy food; if the cap has burrs or cracks, it may cause injury to the eater; if the liquid level is too high If the liquid level is too high, it may cause the explosion of the PET bottle during transportation or under sunlight; if the liquid level is too low, it may cause the loss of the overall image of the enterprise
Manual inspection is a traditional industrial inspection method. The inspector mainly inspects each PET bottle for def

Method used

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  • Detection method of PET bottle cap and liquid level
  • Detection method of PET bottle cap and liquid level

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Embodiment Construction

[0014] Combine figure 1 The process flow chart of the present invention is shown to further describe the present invention. The present invention includes the following steps:

[0015] Step (1): Input the captured PET bottle image into the computer, and segment the image into the region of interest.

[0016] Step (2): Perform image preprocessing on the region of interest to complete the segmentation of the PET bottle body region and the background region. The method of image preprocessing is as follows: firstly, the entire image is grayed out, and only the brightness information of the image is retained; secondly, the grayed out single-channel image is filtered to make the edges of the image clear; again, according to the entire image The grayscale histogram determines the threshold of image binarization, and performs binarization processing on it; finally, the connected domain analysis is performed on the binarized image, and the upper left corner belongs to the background area, ...

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Abstract

The invention discloses a detection method of a PET bottle cap and a liquid level. The method comprises steps of: segmenting an interested zone of an image and carrying out pretreatment on the image; carrying out segmentation on a PET bottle body and a background zone; carrying out PET bottle symmetry axis positioning on the image after the pretreatment; and carrying out detection according to the position of the symmetry axis and a line, which a PET bottle adapter ring is on, and coordinates of an adapter ring central point. The method of the invention can carry out real-time ongoing detection on PET bottle cap and liquid level defect on a high speed automatic production pipeline and realize high detection efficiency.

Description

Technical field [0001] The invention belongs to the technical field of industrial automation detection, and in particular relates to a method for detecting PET bottle caps and liquid levels, which can perform real-time and uninterrupted detection of defects in PET bottle caps and liquid levels on a high-speed automated production line. Background technique [0002] In the current production process of beer, beverages and medicines, filling containers are required to meet corresponding quality standards, and strict tests must be carried out before and after production and filling. For example, for PET bottles, it is necessary to check whether the cap and the liquid level are defective. If the cap is not properly closed, foreign matter may be introduced and the food may be unhealthy; if the cap has burrs or cracks, it may cause injury to the eater; if the liquid level is too high If the liquid level is too low, it may cause the loss of the overall image of the company. [0003] At p...

Claims

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Application Information

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IPC IPC(8): G01N21/88G01F23/292
Inventor 王贵锦何贝施陈博张树君
Owner SHANDONG MINGJIA TECH
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