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Bar on-line automatic counting method based on modified gradient Hough circle transformation

An automatic counting and rod technology, which is applied in the directions of automatic packaging control, packaging, packaging protection, etc., can solve the problems that cannot be fully applied to the production site of rods

Inactive Publication Date: 2012-11-14
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Photoelectric technology is suitable for the situation where there is no overlapping or crossing of the rods or the overlapping is not serious. As the diameter of the rod decreases, the situation of overlapping and crossing becomes more and more serious. At this time, it is difficult to solve the automatic counting problem only with photoelectric technology
The use of digital image processing technology can better solve the identification and counting of bars in the case of overlapping and crossing, but the image processing technology is limited by background noise, light influence and processing methods, and the existing online automatic bar counting method is not fully applicable In various bar production sites

Method used

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  • Bar on-line automatic counting method based on modified gradient Hough circle transformation
  • Bar on-line automatic counting method based on modified gradient Hough circle transformation
  • Bar on-line automatic counting method based on modified gradient Hough circle transformation

Examples

Experimental program
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Effect test

Embodiment 1

[0123] An online automatic bar counting method based on improved gradient Hough circle transformation.

[0124] There are three types of bars produced by a bar factory: 12mm, 14mm, and 16mm. The bars with a size of 16mm are automatically counted online. The steps of the counting method are:

[0125] The first step, bar threshold parameter determination

[0126] This step is to determine the standard radius Rnom, the minimum radius Rmin, the maximum radius Rmax and the combined radius Rcmb threshold parameters corresponding to different specifications of bars, and the specific steps are:

[0127] 1) Set the four parameters of ROI in the rectangular area: ROI.X represents the x-axis coordinate of the upper left corner of the ROI area, ROI.Y represents the y-axis coordinate of the upper left corner of the ROI area, ROI.Width represents the width of the ROI area, and ROI.Height represents the ROI area height. In this embodiment, set: ROI.X=322, ROI.Y=250, ROI.Height=250, ROI.Wid...

Embodiment 2

[0255] An online automatic bar counting method based on improved gradient Hough circle transformation.

[0256] The bar specification that certain bar factory produces is with embodiment 1, and the step of counting method is:

[0257] The first step, bar threshold parameter determination

[0258] Except without accompanying drawing, all the other are with embodiment 1.

[0259] The second step, bar online automatic counting

[0260] According to the specification of the selected bar to be counted as 14mm, read the corresponding standard radius Rnom=6, the minimum radius Rmin=3, the maximum radius Rmax=9 and the combined radius Rcmb=12 in the threshold parameter file ParameterSet.txt, and collect the online The original image of the end face of the bar in the first frame is recorded as the original image of the end face of the bar on-line in the current frame, and then the bar is automatically counted online according to the following steps, and the counting result is stored ...

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Abstract

The invention relates to a bar on-line automatic counting method based on modified gradient Hough circle transformation. The method includes that after threshold parameters of normal radii, minimum radii, maximum radii and combined radii of bars in various specifications are determined, each frame of real-timely collected bar end surface patterns is processed by the following steps of firstly, reinforcing a current frame of bar end surface patterns on the basis of a modified gradient Hough circle transformation method, subjecting the current frame of bar end surface patterns to Regional Max detection and distance detection according to the corresponding threshold parameters, determining an actual observation central point of a current frame of bar end surfaces, and finally, establishing a relevance matching pair relationship between the actual observation central point of the current frame of bar end surfaces and an actual observation central point of a prior frame of bar end surfaces according to horizontal motion speeds of the bars, wherein in each relevance matching pair relationship, if the actual observation central point of the current frame and the actual observation central point of the prior frame are distributed on the left side and the right side of a bar counting central datum line respectively, a counting variable is added by one, and otherwise, the counting variable is reduced by one. The bar on-line automatic counting method has the advantages of being high in real-time performance, high in counting accuracy and capable of bidirectional counting.

Description

technical field [0001] The invention belongs to the technical field of on-line automatic counting of bars. In particular, it relates to an online automatic bar counting method based on improved gradient Hough circle transformation. Background technique [0002] The production of bar products in rolling mills requires that the finished products be packaged in standardized bundles according to the specified number of counts. However, at present, the bars produced in my country's rolling mills are manually counted, which is not only prone to errors, low efficiency, and the packaging quantity cannot meet the requirements, but also does not match with automatic rolling, which affects the improvement of production efficiency and equipment level; on the other hand, due to packaging The exact number of counts cannot be guaranteed, and the market sales are only measured by weight, and the due economic benefits cannot be obtained from the negative tolerance rolling method popular in t...

Claims

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Application Information

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IPC IPC(8): B65B57/20
Inventor 方康玲方红萍苏志祁彭正涛徐源
Owner WUHAN UNIV OF SCI & TECH
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