Battery screen printing quality detecting method based on block template matching

Abstract

The invention discloses a battery screen printing quality detecting method based on block template matching. Original images of batteries are acquired to build a template data set; images of the batteries are corrected; the corrected images of the batteries are tailored; detecting areas are extracted to reduce information redundancy; battery screen printing images are cut from battery backgrounds;a battery screen printing position is determined; block matching is performed on images to be detected by using block template images in the template data set to judge the matching degree between images of the batteries to be detected and templates; block sub images of the batteries to be detected are compared with built template sub images one by one; difference results are analyzed to obtain battery screen printing defect information; aberration quantitative analysis is performed on each sub image to obtain aberration conditions of each part in global images; and meanwhile, average processing is performed to observe global aberration conditions to finish the battery screen printing quality detection. The method needs no manual intervention, and can realize quick high-precision battery screen printing quality detection.

Description

technical field

[0001] The invention belongs to the technical field of machine vision automatic surface detection, and in particular relates to a battery silk screen quality detection method based on block template matching. Background technique

[0002] The screen printing of the test battery is an important step in the battery assembly process. Different types of batteries have differences in character types (Chinese characters, Korean, English, numbers, etc.), character formats, illustration content, and barcode formats. At present, the screen printing of battery cells is affected by fixtures, equipment, personnel and other related factors to cause printing defects. The types of screen printing defects are mainly divided into: silk screen defect / skew / fuzzy / ghosting / dirty / chromatic aberration, screen printing and barcode information do not match, and screen printing position is wrong. Comply with specifications etc. At present, battery manufacturers mainly rely on artific...

Examples

Embodiment Construction

[0072] The detection method proposed by the present invention is a detection method based on template matching, so the system needs a template before the battery screen printing detection. Because there are many types and models of batteries, the creation of detection templates needs to be specific to specific models. The creation of the template includes two aspects, that is, the creation of the template image and the creation of the configuration file. The color difference of each part in the global image can be obtained by using the color difference detection algorithm. At the same time, it can also be averaged to observe the global chromatic aberration.

[0073] see Figure 8 , the creation of the template image:

[0074] Select a flawless battery to collect its image, and then use the automatic threshold method on the image to separate the battery from the background, and then perform tilt correction and cropping on the battery image. All printed content must be includ...

technical field

[0001] The invention belongs to the technical field of machine vision automatic surface detection, and in particular relates to a battery silk screen quality detection method based on block template matching. Background technique

[0002] The screen printing of the test battery is an important step in the battery assembly process. Different types of batteries have differences in character types (Chinese characters, Korean, English, numbers, etc.), character formats, illustration content, and barcode formats. At present, the screen printing of battery cells is affected by fixtures, equipment, personnel and other related factors to cause printing defects. The types of screen printing defects are mainly divided into: silk screen defect / skew / fuzzy / ghosting / dirty / chromatic aberration, screen printing and barcode information do not match, and screen printing position is wrong. Comply with specifications etc. At present, battery manufacturers mainly rely on artific...

Examples

Embodiment Construction

[0072] The detection method proposed by the present invention is a detection method based on template matching, so the system needs a template before the battery screen printing detection. Because there are many types and models of batteries, the creation of detection templates needs to be specific to specific models. The creation of the template includes two aspects, that is, the creation of the template image and the creation of the configuration file. The color difference of each part in the global image can be obtained by using the color difference detection algorithm. At the same time, it can also be averaged to observe the global chromatic aberration.

[0073] see Figure 8 , the creation of the template image:

[0074] Select a flawless battery to collect its image, and then use the automatic threshold method on the image to separate the battery from the background, and then perform tilt correction and cropping on the battery image. All printed content must be includ...

Images