Method for detecting heat sealing defects of external packaging transparent film

Abstract

The invention discloses a method for detecting heat sealing defects of an external packaging transparent film. The heat sealing defects are detected through a non-contact digital image processing technology. The heat sealing face of the external packaging transparent film is converted to digital image information through a CCD camera; the image information is input to a computer for preprocessing; size adjustment and gray-scale processing are carried out, and a median filter is adopted for denoising; preprocessed images are segmented, a zero-defect original image serves as a tool image to carry out deduction operation on the segmented images, and a background image is removed; edge detection is carried out on defect characteristics in the images through a Roberts operator; an image defective region is marked through a BWlabel algorithm, and the number and area of the defect characteristics are counted through a Regionprops algorithm. The number and area of the defect characteristics extracted out according to image analysis are compared with the qualification standard, so that the effect of detecting the defects of the external packaging transparent film is achieved. The heat sealing defects of the external packaging transparent film are detected through a computer processing technology, and the method can be applied to a packaging production line for automatic detection.

Description

technical field [0001] The invention relates to the technical field of detection of packaging defects of transparent films in product outer packaging, in particular to a detection of heat sealing defects of transparent films. Background technique [0002] The outer packaging film of the product often has defects such as packaging bubbles, wrinkles, and slack, which seriously affect the image of the product. Due to the high light transmittance of the packaging film, manual visual inspection is mostly used at present, and the detection effect is not ideal. The experience and skills of the operator are greatly affected. It is impossible to automatically detect the heat-sealing defects of the outer packaging film of the product on the automatic production line. [0003] The existing detection technology used in the film production line is easy to implement when dealing with single-layer film defect detection, but it is difficult to automatically detect the defects of transparent...

AI Technical Summary

Problems solved by technology

[0002] The outer packaging film of the product often has defects such as packaging bubbles, wrinkles, and slack, which seriously affect the image of the product

Due to the high light transmittance of the packaging film, manual visual inspection is mostly used at present, the detection effect is not ideal, and the experience and skills of the operator are greatly affected. It is impossible to automatically detect the heat-sealing defects of the outer packaging film on the automatic production line.

[0003] The existing detection technology used in the film production line is easy to implement when dealing with single-layer film defect detection, but it is difficult to automatically detect the defects of transparent films when the film is packaged on products printed with pictures and texts of different colors , resulting in difficult control of product packaging film heat sealing quality, prone to defective packaging affecting product image

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