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Method for detecting bottle cap surface production date based on machine vision

A detection method and machine vision technology, applied in the direction of optical testing flaws/defects, etc., to achieve good real-time performance, high accuracy, and fewer steps

Inactive Publication Date: 2016-02-03
TIANJIN UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of manual detection and the limitations of bottle cap detection, and provide a method for on-line detection of production date on the surface of bottle caps based on machine vision

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  • Method for detecting bottle cap surface production date based on machine vision
  • Method for detecting bottle cap surface production date based on machine vision
  • Method for detecting bottle cap surface production date based on machine vision

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0025] see figure 1 , a bottle cap surface production date detection system device based on machine vision, which is divided into 5 modules functionally, namely conveyor belt 1, image acquisition module 2, photoelectric trigger 3, lighting module 4, image processing and recognition 5. The above-mentioned image acquisition module 2 uses a 1.2 million-pixel CCD camera, the lighting module 4 uses an LED ring light source, and the image processing and recognition module 5 uses an industrial computer. The conveyor belt 1 transports the bottle to be tested to the photographing station, and the photoelectric trigger device 3 is used to detect whether the bottle arrives at the photographing position, so as to generate a pulse signal and deliver it to the industrial computer 5, and the industrial computer sends a signal to trigger the camera 2 to take pict...

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Abstract

The invention relates to a method for detecting a bottle cap surface production date based on machine vision. According to the method, an LED white ring light source illuminates the surface of a to-be-measured bottle cap. The method comprises the steps of collecting image information of a qualified bottle cap; collecting an image of a to-be-measured bottle cap; performing binarization processing on an image having undergone median filtering pre-processing; performing circle location, finding a bottle cap edge to serve as a round edge, and taking the circle center as an original point to establish a coordinate system; presetting the upper limit and the lower limit of the pixel point number of detection targets according to the pixel point number of sprayed production date codes on the qualified bottle cap, utilizing the round edge obtained in the step 4) and the coordinate system which has been established to set the inside of the circle as an region of interest (ROI), taking the sprayed production date codes as the detection targets, and performing bottle cap detection. A algorithm in use is simple, the steps are fewer, quick detection of the image is achieved, the detection efficiency is high, and the method is subjected to a small environmental influence and is high in accuracy.

Description

technical field [0001] The invention relates to an online detection method for the production date on the surface of a bottle cap, which belongs to the field of machine vision. Background technique [0002] In industrial production lines such as beverages and beer, most of them use manual visual inspection to check whether the bottles are qualified. [0003] Especially in the production of bottle caps, it is necessary to print the production date on the bottle caps, and there may be situations where the spray code is blurred or missed. [0004] Because human eyes are prone to visual and physical fatigue, the efficiency is often very low, which will cause missed or false detections, and the labor cost is also getting higher and higher. The flow of these substandard products into the market will cause consumers to distrust the quality of the products, affect sales, and even cause problems such as drinking expired products by mistake and endangering health. [0005] Aiming at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88
Inventor 吕辰刚刘影郭玺杨嘉琛丁珏米岩陈德胜
Owner TIANJIN UNIV
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