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Mobile phone glass cover plate defect detecting method based on principal component analysis

A principal component analysis, glass cover technology, used in image analysis, computer parts, image data processing, etc.

Inactive Publication Date: 2014-07-23
SOUTH CHINA UNIV OF TECH
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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 manual detection of mobile phone glass cover defects, and proposes an automatic detection method based on mobile phone shell glass defects

Method used

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  • Mobile phone glass cover plate defect detecting method based on principal component analysis
  • Mobile phone glass cover plate defect detecting method based on principal component analysis
  • Mobile phone glass cover plate defect detecting method based on principal component analysis

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Embodiment

[0058] Such as figure 1 As shown, the present invention discloses a mobile phone glass cover defect detection method based on principal component analysis. The method mainly includes the following six steps: S1, contrast enhancement of the mobile phone glass cover image, S2, image binarization, S3 , Removing outliers, S4, defect identification based on PCA, S5, edge detection, S6, output of detection results, wherein steps S1, S2, and S3 are preprocessing of the mobile phone glass cover image.

[0059] Step S1, Contrast Enhancement of Mobile Phone Glass Cover Image

[0060] S11. Given a mobile phone glass cover image, first detect the crack defect and the gray value distribution f(i,j) of the edge pixels of the glass cover, and then determine the gray threshold τ according to the gray value distribution.

[0061] S12. Use the log function to enhance image contrast, see formula (1), when the gray value is less than the threshold (ie peak+τ, where τ is a dynamic constant) the p...

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Abstract

The invention discloses a mobile phone glass cover plate defect detecting method based on principal component analysis. The defect detecting method includes the six steps of contrast enhancement of a mobile phone glass cover plate image, image binaryzation, outlier rejection, defect recognition based on PCA, edge detection and detection result output, the contrast of defects and a background is enhanced by preprocessing the mobile phone glass cover plate image, influence of dust, electronic noise and the like can be avoided, the defects are recognized by adopting a principal component analysis algorithm, the result of defect types is output, and edge detecting and marking are performed on the defects by adopting an edge extraction algorithm. The method remarkably improves detection efficiency and overcomes the defects that manual visual detection consumes time, is tedious and highly depends on detection experience.

Description

technical field [0001] The invention relates to a defect detection technology, in particular to a defect detection method for a mobile phone glass cover plate based on principal component analysis. Background technique [0002] With the rapid development and popularization of mobile networks and mobile phones, the demand for the production of glass cover plates for mobile phone casings has increased sharply, and the quality of glass cover plates is an important part of mobile phone quality inspection. At present, the common detection methods for defects in mobile phone glass covers still rely on manual visual inspection, which is time-consuming and cumbersome, and highly dependent on inspection experience. [0003] In the past inspection technology for glass cover plates, it mainly detects a limited number of defects generated during the manufacturing process of glass cover plates (generally for 1 or 2 types of defects). , these technologies generally use image subtraction ...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06K9/62
Inventor 梁列全李迪周璇张舞杰
Owner SOUTH CHINA UNIV OF TECH
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