Visual detection method for quality of liquid medicine on high-speed pharmaceutical production line

Abstract

The invention discloses a visual detection method for the quality of liquid medicine on a high-speed pharmaceutical production line. The visual detection method is characterized by comprising the following steps of: firstly, acquiring images, i.e., acquiring five continuous sequence images of liquid medicine under a halted state of a bottle after revolution at a high speed, wherein the shot images are the gray-level images; secondly, initially denoising the images, i.e., removing the dynamic interference of the bottle wall by an offset background reduction method based on a characteristic point; thirdly, detecting a target, i.e., removing the static interference by a difference method and a threshold-based division method; fourthly, recognizing the target, i.e., judging whether the target is a foreign body or not according to the continuation of the motion trail of the target, and recording the foreign body; and fifthly, judging the target, i.e., judging whether the foreign body is the visible foreign body or not according to whether the size of the recorded foreign body exceeds the specified range or not. The method has the advantages of high detection precision and high detection speed.

Description

technical field [0001] The invention belongs to the technical field of machine vision detection, and relates to a method for visual detection of liquid medicine quality on a high-speed pharmaceutical production line. technical background [0002] In order to regulate and maintain my country's pharmaceutical market and ensure the quality of medicines, my country's National Pharmacopoeia has put forward strict requirements on the quality inspection of medicines, an important part of which is the detection of visible foreign matter. The Pharmacopoeia stipulates that there are two methods for the detection of visible foreign matter: the light detection method and the light scattering method. A liquid medicine adopts the lamp inspection method, and a small number adopts the light scattering method. The light inspection method is "remove the label of the container, clean the outer wall of the container, gently rotate and flip the container to suspend the visible foreign matter in...

AI Technical Summary

Problems solved by technology

Due to the high-speed requirements of the automatic light inspection machine, at high speed, the machine is in a state of rapid motion, so that when the image is taken, the drug bottle is not completely in a static state, but is often still moving at a slow speed when shooting, resulting in The image will be biased, and the number of foreign objects in the liquid medicine is relatively small, and the individual is relatively small, usually only occupying a few or a dozen pixels in the image, so the movement of the bottle during shooting makes the detection method easier Affected by disturbance factors

[0006] (2) The number, shape, size, and weight of foreign objects in the liquid medicine are not fixed, and there is no obvious texture information to use, which increases the difficulty of detection

Due to the speed requirements of the automatic light inspection machine, the general target detection and recognition methods cannot meet the requirements of high speed and high precision online at the same time

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