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Method for positioning boundaries of belt layers at tyre crown part of X-ray image of tyre

A belt layer, optical image technology, applied in the direction of image analysis, image data processing, instrument, etc., can solve the problem of crown defect grading, belt position offset and other problems

Active Publication Date: 2013-01-09
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the crown part, since there are multiple belt layers superimposed on each other, the position of the belt layer is shifted or the layer is missing, which will seriously affect the defect classification of the crown part of the tire X-ray image

Method used

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  • Method for positioning boundaries of belt layers at tyre crown part of X-ray image of tyre
  • Method for positioning boundaries of belt layers at tyre crown part of X-ray image of tyre
  • Method for positioning boundaries of belt layers at tyre crown part of X-ray image of tyre

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Embodiment Construction

[0062] Such as figure 1 As shown, the multi-belt layer texture separation method applied to the X-ray image of the tire crown in the present invention is applied to sub-images of appropriate sizes in the X-ray image of the tire. The size of the subimage is 2 9 *2 9 , the sub-image covers the left and right edges of the crown; meanwhile, the four sides of the sub-image are parallel to the four sides of the tire X-ray image;

[0063] Such as figure 2 As shown, this is a schematic diagram of a Gaussian wedge filter template generated by using the Gaussian wedge filter formula. It can be seen that the Gaussian wedge filter template is symmetrical about the center point.

[0064] Such as image 3 As shown, the specific steps of the tire X-ray image crown position belt layer boundary positioning method are as follows:

[0065] The first step is to obtain a complete tire X-ray image I X , in this X-ray image I X The interior, and also the crown part, is cut to a size of 2 N...

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Abstract

The invention relates to a method for positioning the boundaries of belt layers at a tyre crown part of an X-ray image of a tyre. The method comprises the steps of: positioning belt layers of all the belt layers at the tyre crown part of the X-ray image of a tyre, carrying out frequency-spectrum analysis on the tyre crown part of the X-ray image of the tyre with overlapped multiple belt layer textures, respectively processing frequency-spectrum information by using a Gaussian wedge-shaped filter with the angle between 0 degree and 179 degrees, restoring the extracted frequency-spectrum information into images, carrying out grey statistics to obtain gray statistical information vectors, combining all the gray statistical information vectors and converting the combined gray statistical information vectors into a gray information image, observing and selecting the gray information vectors which can be used for measuring and calculating the boundary information of all the belt layers, andcalculating the boundary position coordinates of all the belt layers according to the selected gray information vectors.

Description

【Technical field】 [0001] The invention belongs to the technical field of digital image processing, and in particular relates to the application of multi-texture images formed by superimposing multi-belt layer textures in tire X-ray images to locate the boundaries of each belt layer. 【Background technique】 [0002] Tires are the main action-executing components of motor vehicles. The stability of tire performance and compliance with safety design standards will directly determine the safety of personnel using motor vehicles. The tire is a circular rotatable body with a cylindrical section, which is made of multi-layer rubber prefabricated materials with steel cords and composite rubber prefabricated materials through lamination, molding, vulcanization and setting. In the tire with the above structure, problems such as uneven density of steel cords, breakage of cord steel wires, lack of steel cords and the like inevitably exist in the constituent materials of the tire crown. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
Inventor 黄战华刘正都强蔡怀宇杭柏林王孔茂
Owner TIANJIN UNIV
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