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Method and system for positioning mark center with weak contrast

A positioning mark and contrast technology, which is applied in image data processing, instrumentation, calculation, etc., can solve the problems of weak contrast positioning mark center, limitation and low precision, and achieves the effects of reliable results, good stability and fast speed.

Pending Publication Date: 2020-08-07
ZHAOQING ZHONGDAO OPTOELECTRONICS EQUIP CORP
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the limitations and low precision of the current method, the present invention proposes a method for locating the center of the mark with weak contrast

Method used

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  • Method and system for positioning mark center with weak contrast
  • Method and system for positioning mark center with weak contrast
  • Method and system for positioning mark center with weak contrast

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Experimental program
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Embodiment 1

[0039] Such as figure 1 As shown, the object of the present invention is to obtain the center of a weak contrast localization mark. The calculation process is as follows:

[0040] 1. Use the red component image of the positioning marker image to extract the image (such as figure 2 shown in the image) with boundaries such as image 3 :

[0041] A) Obtain the red component of the image, and calculate it according to the RGB component ratio of the image. The RGB component ratios are: 0.299, 0.587, and 0.114.

[0042] B) Extract the edge of the positioning mark image using a 3X3 Sobel filter, and the horizontal and vertical filters are as follows:

[0043]

[0044] 2. Gaussian filtering and image binarization such as Figure 4 :

[0045] A) Gaussian filtering uses a 3X3 kernel, and the filter is as follows:

[0046]

[0047] B) Calculate the threshold for image binarization. First calculate the grayscale histogram of the image, and filter the high-frequency signal a...

Embodiment 2

[0056] This embodiment provides a system for positioning the center of the mark with weak contrast, such as Figure 7 shown, including:

[0057] Extract image boundary module 100, for the red component image that extracts seeks the boundary of positioning marker image;

[0058] An image binarization module 200, configured to binarize the image after Gaussian noise removal;

[0059] The image denoising module 300 is used to remove sparse discrete points and retain useful information on the edge of the positioning marker image;

[0060] The module 400 for calculating the center of the positioning mark image is used for calculating the horizontal and vertical coordinates of the center of the positioning mark image.

[0061] The beneficial effect of this embodiment is that the boundary extraction of the positioning mark image is realized by extracting the red component image, binarized after Gaussian filtering, the image expansion operation removes noise points again, and finall...

Embodiment 3

[0063] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and operable on the memory, and the processor executes the program to implement the computer program described in Embodiment 1. The weak contrast method described above locates the center of the marker.

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Abstract

The invention discloses a method and a system for positioning a mark center with weak contrast. The method comprises the following steps: performing edge extraction on a red component of an image to obtain an edge image, performing Gaussian filtering and binarization on the edge image to obtain a binarized image, performing dilation operation on the binarized image and removing noise to obtain a denoised image, and finally calculating a weak contrast positioning mark center. The method has the characteristics of high precision, high speed and good stability in a visual detection system. The precision of the method reaches the sub-pixel level, the result is reliable, and the method is widely applied to the visual inspection industry; and the method and system suitable for similar images with symmetry and weak contrast.

Description

technical field [0001] The invention belongs to the technical field of computer vision detection, and in particular relates to a method and system for locating the center of a mark with weak contrast. Background technique [0002] With the continuous development and progress of science and technology, computer vision inspection technology has the advantages of fast, efficient, high precision and integration, and is widely used in highly automated manufacturing industries. In recent years, especially in the era of rapid development of the TFT-LCD panel inspection industry, various automatic optical inspection equipment have emerged as the times require. Facing fierce market competition and increasing shipment speed, automatic optical inspection equipment must operate efficiently. In particular, the TFT-LCD panel must be positioned quickly and accurately on the automatic optical inspection equipment, which plays an important role in improving the inspection efficiency and acc...

Claims

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Application Information

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IPC IPC(8): G06T7/66G06T7/90G06T7/13G06T7/136G06T5/00G06T5/30
CPCG06T7/66G06T7/90G06T7/13G06T7/136G06T5/30G06T5/70
Inventor 查世华杨义禄李波左右祥
Owner ZHAOQING ZHONGDAO OPTOELECTRONICS EQUIP CORP
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