Anti-vibration machine vision detection method of foreign matters in liquid medicine

Abstract

The invention discloses an anti-vibration machine vision detection method of foreign matters in a liquid medicine. The detection method comprises the following steps of: step 1, obtaining images; step 2, matching the images: carrying out matching pre-processing on adjacent frame gray level images by utilizing a relevant sub-pixel image matching algorithm based on a hill-climbing search phase; step 3: carrying out inter-frame difference: carrying out difference on the matched adjacent frame gray level images to remove static background information and keep movable foreign matter information; step 4: detecting a target: carrying out binary segmentation and connected domain search on the images obtained by the inter-frame difference, calculating area of each foreign matter area and finding out the largest foreign matter area; and step 5, judging a decision: judging whether an existing product is an inferior-quality product by judging whether the largest foreign matter area exceeds a standard, and finishing the detection process. The anti-vibration machine vision detection method of the foreign matters in the liquid medicine, disclosed by the invention, has the advantages of capability of effectively eliminating the vibration interference of an electromechanical system, strong robustness and capability of greatly reducing designing and manufacturing costs of detection equipment ofthe foreign matters in the liquid medicine.

Description

technical field [0001] The invention belongs to the technical field of intelligent machine vision detection of visible foreign matter in liquid medicine, and relates to an anti-vibration machine vision detection method of foreign matter in liquid medicine. Background technique [0002] Due to defects in the production process and packaging process of liquid medicines such as medical infusions, ampoules, and vials, the liquid medicine may contain hair, fibers, solid insolubles, glass debris and other visible foreign matter in the production process. Once it enters the patient's blood vessels, it will It seriously threatens the life safety of patients. Therefore, before the medicine leaves the factory, it is necessary to carry out visible foreign matter detection bottle by bottle, commonly known as "light inspection", to remove defective products containing foreign matter. Machine vision-based liquid foreign matter detection equipment uses technologies such as visual sensing, ...

AI Technical Summary

Problems solved by technology

[0006] (1) Due to mechanical processing and assembly errors, when the system is running at high speed, system vibration is inevitable, and with the increase of mechanical operating speed, the vibration amplitude increases sharply;

[0007] (2) When the cam intermittent system is in the static stage of the main wheel, there is still a certain degree of shaking between the bottle body and the industrial camera; in the servo tracking system, the bottle body and the camera cannot be guaranteed in the forward and uniform tracking stage from the wheel. absolute synchronization;

[0008] (3) The discrete encoder of the servo motor will cause the electrical drive part to vibrate to a certain extent when tracking or stopping

[0009] The above problems lead to the inability to maintain an ideal relative static state between the CCD industrial camera and the mechanical device and the bottle during the image acquisition stage, so that the traditional frame-to-frame difference algorithm cannot remove the background interference of the clamping device and the bottle, and cannot distinguish the background from the visible Foreign matter, causing detection failure (such as Figure 12 .b), and with the increase of the operating speed of the system, the interference increases sharply, becoming the key bottleneck restricting the improvement of the detection speed

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