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Machine vision system and method for enhancing raised features on surface of pattern

A machine vision system and feature enhancement technology, which is applied in the field of vision systems, can solve problems that affect the misjudgment rate of the detection system, reduce product yield, and reduce production capacity, and achieve the goal of improving versatility, enhancing versatility, and reducing calculation errors Effect

Active Publication Date: 2020-11-03
WESTLAKE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, to a certain extent, it affects the misjudgment rate of the detection system, reduces the production yield of the product, and leads to a decline in production capacity.

Method used

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  • Machine vision system and method for enhancing raised features on surface of pattern
  • Machine vision system and method for enhancing raised features on surface of pattern
  • Machine vision system and method for enhancing raised features on surface of pattern

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] like figure 1 As shown in the figure, the sample surface of the object to be detected 10 with a complex pattern background, and there are protrusions on the surface, such as characters, etc., are placed under the imaging unit and the lighting unit. The imaging unit is composed of an image acquisition device 3 and an imaging device 4. The resolution of the camera and imaging lens of the corresponding target surface can be selected according to the field of view and resolution to be detected. The illumination unit is composed of four uniform strip lights with different angles in the horizontal direction, and the incidence angles of the four groups of LED light sources are 0 °, 90°, 180° and 270°, and the distance h, rotation angle θ and center distance d of each light source from the surface of the sample to be detected can be adjusted, that is, the entire surface to be detected can be fully illuminated by adjusting the above parameters, and no It will generate a dark ar...

Embodiment 2

[0065]This embodiment enhances the features of the raised characters in the complex pattern background, and can easily recognize the characters therein by using the existing character recognition technology.

[0066] Recognition of raised characters in complex pattern background, in traditional detection, the test results such as Figure 4 As shown in (c), due to the inherent light and dark printed pattern of the surface in the image background, the raised characters also have light and dark gray scales. As can be seen from the figure, it is difficult to directly observe the raised characters from the image, and it is difficult to recognize the content using the existing character recognition technology.

[0067] Using the system of the present invention, firstly, according to the size of the surface to be detected, the height of the light source, the spin angle and the center distance are adjusted, and the characters on the surface to be detected are evenly illuminated, espec...

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Abstract

The invention belongs to the technical field of visual systems, and particularly relates to a machine vision system and method for enhancing raised features on a surface of a pattern, and the system comprises an image collection device, an imaging device, a first LED lamp and a second LED lamp. According to the system and method, four images under different incident light direction conditions canbe obtained through two times of exposure of four groups of incident light sources with different wavelengths and the prism camera, mutual interference does not exist, and compared with four times oftime-sharing exposure in a traditional mode, the detection efficiency is improved. Parameters such as the angle height and the center distance of the light source can be adjusted according to attributes of the to-be-detected surface, the universality is high, and in the image processing method of the system, gradient change distribution of the to-be-detected surface is obtained through calculation; in combination with an image and a processing mode, calculation errors caused by inaccurate illumination angle and uneven illumination of the system can be weakened, so that environmental conditionsfor system installation are reduced.

Description

technical field [0001] The present invention relates to the technical field of vision systems, in particular to a machine vision system and method for enhancing raised features on a pattern surface. Background technique [0002] Machine vision technology is a science involving artificial intelligence, neurobiology, psychophysics, computer science, image processing, model Recognition and many other fields of interdisciplinary. Machine vision mainly uses computers to simulate human visual functions, extract information from images of objective things, process and understand them, and finally use them for actual detection, measurement and control. The biggest feature of machine vision technology is fast speed, large amount of information and multiple functions. [0003] In some complex pattern surface inspection, machine vision technology can be used to detect the difference of the surface pattern texture. That is, different information is clearly stored in a two-dimensional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/956G01N21/88G01N21/01
CPCG01N21/956G01N21/8806G01N21/8851G01N21/01G01N2021/8816G01N2021/8845G01N2021/8887G01N2021/0181G01N2021/0112
Inventor 李晨熊浩亮余兰林丁一于长斌
Owner WESTLAKE UNIV