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Method and device for detecting scratches on the surface of an optical element

A technology of optical components and detection methods, applied in image data processing, instruments, calculations, etc., can solve problems such as discontinuity of the surface of large-diameter optical components, and achieve the effects of strong scalability, high accuracy and fast detection speed.

Active Publication Date: 2018-02-09
INST OF AUTOMATION CHINESE ACAD OF SCI +1
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Problems solved by technology

[0005] Aiming at the deficiencies of the existing scratch detection methods, the present invention provides a detection method for large-aperture optical elements with discontinuous surfaces and curved scratches

Method used

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  • Method and device for detecting scratches on the surface of an optical element

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Embodiment 1

[0029] A detection method for discontinuity and bending scratches on the surface of the optical element of the present invention is mainly implemented by a computer.

[0030] Such as figure 1 As shown, a method for detecting scratches on the surface of an optical element in an embodiment of the present invention, the specific operation steps are as follows:

[0031] 1) Binarize the image on the surface of the optical element, and store it in the hard disk of the computer with the number i (i=1, 2...);

[0032] 2) Apply the LSD (Line Segment Detector) algorithm to the i-th image in step 1) to obtain a set of line segments detected by the algorithm; this set of line segments can provide the position information of the scratch and its approximate direction, each line segment Including: start point coordinates and end point coordinates. This step obtains preliminary scratches on the surface of the optical element according to the image;

[0033] 3) classify all the line segment...

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Abstract

The invention discloses a method and a device for detecting a scratch on the surface of an optical element. The method comprises steps: after binarization is carried out on an image of the optical element surface, information of the initial scratch on the optical element surface is detected and obtained; the information of the initial scratch is grouped, each group represents one complete scratch; according to the information of the initial scratch after grouping, an interested processing rectangular area for each complete scratch is obtained; according to the interested processing rectangular area for each complete scratch, a precise scratch point set corresponding to each complete scratch is acquired; the precise scratch point set corresponding to each complete scratch is segmented, and interference noisy points in each segment are eliminated; and a set of all points in each complete scratch and the precise scratch point set for each complete scratch are combined, and the information of the scratch corresponding to each complete scratch is acquired, wherein the scratch information comprises the length and indicates whether bending exists. The scheme of the invention has an anti-noise interference ability, and the detection speed is quick.

Description

technical field [0001] The invention belongs to the field of machine vision detection, and more specifically relates to a detection method for the discontinuity and bending scratches on the surface of a large-diameter optical element. Background technique [0002] During the production process of optical components made of glass and other materials, due to the influence of factors such as production environment, production process and manual operation, scratches will inevitably be caused on the surface of optical components. At the same time, scratches will change the performance of optical components and affect their normal use. Therefore, it is very necessary to perform scratch detection and quantitative analysis on the surface of optical components before using them. [0003] At present, in factories producing and assembling optical instruments, manual inspection is mainly relied on, which is inefficient, time-consuming and laborious, and the inspection results are highl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
CPCG06T7/0008G06T2207/30164
Inventor 陶显张正涛姜宏振徐德王子昊罗家祯张鸿燕袁伦喜刘旭
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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