Automatic lens flaw detection method

An automatic detection and defect technology, applied in the direction of measuring devices, material analysis through optical means, instruments, etc., to achieve the effect of improving efficiency

Inactive Publication Date: 2017-02-01
杜鹏飞
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the deficiencies in manual detection and existing research, the purpose of the present invention is to provide an automatic detection method for lens defects applicable to different types of lenses, to improve detection accuracy and efficiency, and to provide a basis for online detection of lenses

Method used

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  • Automatic lens flaw detection method

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Embodiment Construction

[0017] Introduce detailed technical scheme of the present invention below in conjunction with accompanying drawing: as figure 1 Shown, a kind of lens defect automatic detection method is characterized in that: comprises the following steps:

[0018] (1) The backlight is modulated by the grating, which can enhance the contrast between the surface defect and the intact area of ​​the lens;

[0019] (2) The grating is driven by the linear screw slide, and its moving distance is equal to the interval of the grating stripes. By collecting the lens image twice, the bright and dark field images of all positions of the lens can be collected;

[0020] (3) During the detection process, the relative position between the lens and the camera does not change, and the bright and dark fields in the two collected images are spliced ​​according to the principle of image order preservation;

[0021] (4) In the dark field image, the gray value is higher than the dark field stripe area extracted b...

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Abstract

The invention discloses an automatic lens flaw detection method, wherein mainly a machine vision technology and grating backlight modulation combined method is used to rapidly detect, classify and position the lens flaw. According to the present invention, a lens image is subjected to two sampling through a grating position moving method, the bright field image and the dark field image are spliced and matched based on an image isotonicity principle, and the clarification, the positioning and the measurement of the lens flaw are achieved by analyzing the gray value and the morphological features in the bright field image and the dark field image, such that the accuracy and the efficiency of the lens detection are substantially improved.

Description

technical field [0001] The invention relates to an automatic detection method for lens defects, in particular to a method and a device for automatically detecting defects on the lens surface by using a grating to modulate a plane backlight source and using machine vision technology. Background technique [0002] Lens defect detection is not only an important link to ensure the pass rate of ex-factory lenses, but also an effective method to monitor the production process. At present, the automation level of the lens production process is gradually improving, but the lens quality inspection is still all done by manual inspection. On the one hand, lens quality inspection is an important link to ensure the pass rate of ex-factory lenses. Manual inspection largely depends on the experience and technology of inspectors, and is easily affected by subjective factors, individual differences and other factors, resulting in a high false detection rate; On the one hand, real-time monit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/958
Inventor 杜鹏飞
Owner 杜鹏飞
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