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Method for detecting label of polyethylene terephthalate (PET) bottle

A detection method and label technology, applied in measuring devices, instruments, optical devices, etc., can solve problems such as low detection efficiency, and achieve the effects of high detection efficiency, accurate detection results, and simplified calculation complexity.

Active Publication Date: 2012-06-27
SHANDONG MINGJIA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For these possible labeling problems, they were previously determined by visual inspection for quality control, and the detection efficiency was low

Method used

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  • Method for detecting label of polyethylene terephthalate (PET) bottle
  • Method for detecting label of polyethylene terephthalate (PET) bottle
  • Method for detecting label of polyethylene terephthalate (PET) bottle

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Embodiment Construction

[0022] combine figure 1 Shown flow chart of the present invention, the present invention is described in detail, and the detection method of PET bottle label comprises the following steps:

[0023] Step (1): Input the captured label image into the computer.

[0024] Step (2): Find the left and right boundaries of the label. The method is as follows: first, calculate the gradient of the label in the horizontal direction, find the local gradient maximum point and binarize it; The summation in the direction obtains the gradient accumulation curve; thirdly, using the appropriate percentage of the maximum value in the curve as the threshold, find the leftmost and rightmost local extreme points in the curve that are greater than the threshold, that is, get the left and right of the label border position.

[0025] Step (3): Calculate the position of the center line of the upper and lower boundaries of the label within the range of the left and right boundaries of the label, and jud...

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Abstract

The invention discloses a method for detecting a label of a polyethylene terephthalate (PET) bottle, which comprises the steps of: inputting the shot label image into a computer, solving a left margin and a right margin of the label, carrying out statistics on the position of a central line of an upper margin and a lower margin within the range of the left margin and the right margin of the label, judging whether the label has up and down excursion and misplacement of a bonding surface or not, and judging whether the label has left and right excursion or not by matching a template. The method can be used for detecting the label of the PET bottle in real time in a continuous way on a high-speed automatic production line, and the detection efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of automatic detection, and in particular relates to a detection method for PET bottle labels. Background technique [0002] At present, in the production process of bottled beverages, the labels on the product packaging need to face the strict requirements of the industry. Beverage labels that need to be tested can be mainly divided into two types: sleeve labeling and labeling. For sleeve labeling, the sleeve labeling machine directly puts the label on the bottle above the beverage bottle. After the label is heated, the label shrinks and fixes on the bottle body. This type of label Generally, there will be no misalignment of label joints. The main things that need to be detected are the height of the label position and the left-right offset. For labeling, the labeling machine cuts off a complete label and sticks it on the beverage bottle. When the labeling is completed, the adhesive surface of the label wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00
Inventor 王贵锦阮治未施陈博张树君
Owner SHANDONG MINGJIA TECH