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Flash defect recognition method for complex injection molded products based on multi-template low-rank decomposition

A technology for injection molding products and low-rank decomposition, which is used in image analysis, instrumentation, computing and other directions to achieve the effects of high reliability, high detection robustness, and low requirements for image acquisition environments

Active Publication Date: 2020-11-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for identifying flash defects of complex injection molded products based on multi-template low-rank decomposition

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  • Flash defect recognition method for complex injection molded products based on multi-template low-rank decomposition
  • Flash defect recognition method for complex injection molded products based on multi-template low-rank decomposition
  • Flash defect recognition method for complex injection molded products based on multi-template low-rank decomposition

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Embodiment Construction

[0046] The method for identifying flash defects of complex injection molded products based on multi-template low-rank decomposition of the present invention will be further described below using the drawings and examples.

[0047] Such as figure 1 As shown, the solid line process represents the offline training stage, and the dotted line process is the online test stage. The present invention mainly includes the following steps:

[0048] Step 1: Collect multiple images of injection molded products with flash defects under the background image as sample images, convert multiple sample images into corresponding initial grayscale images, and then use the background subtraction method to obtain multiple sample binary images and optimize. The step 1 specifically includes:

[0049] 1.1) Select a background with a large color difference from the injection molded product, collect a background image without an injection molded product and convert it into a background grayscale image,...

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Abstract

The invention discloses a complex injection molding product flash defect identification method based on multi-template low-rank decomposition. The method comprises collecting the defective injection molding product sample images, extracting foreground gray level images, obtaining template images from the foreground gray level images by adopting a method of decomposing a low-rank matrix, extractinghole areas of the template images and the sample images on the basis of contours, and matching the templates and the hole areas of the samples on the basis of position similarity; constructing hole area angle feature descriptors corresponding to the template and the sample image, and calculating similarity to determine whether a flash defect exists or not. According to the present invention, a defect-free product does not need to be obtained in advance, the method is not influenced by tiny deviation during shooting, the influence of image brightness nonuniformity, noise and the like is small,and the detection robustness is high.

Description

technical field [0001] The invention belongs to the field of defect detection of injection molding products, and in particular relates to a flash defect recognition method of complex injection molding products based on multi-template low-rank decomposition. Background technique [0002] Injection molding is realized through injection molding machines and molds, injecting thermoplastics or thermosetting plastics into the mold to make various parts with high precision and complex cavity shapes. The quality inspection of injection molded products is a key link in injection molding, which can be used as an important basis for adjusting the parameters of injection molding machines. Defects of injection molded products include insufficient filling, flash, air bubbles, streamlines, etc. The flash is a defect formed by molten plastic overflowing from the mold cavity. The flash on the outer boundary contour can be removed by post-processing, but the flash on the inner contour bounda...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T7/13
Inventor 赵昕玥梁晶晶何再兴张树有谭建荣
Owner ZHEJIANG UNIV
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