A method for measuring tire wear with line structured light machine vision

Abstract

The invention discloses a line structured light machine vision tire abrasion measuring method. The method is characterized in that the method includes the following steps: capturing a tire contour image of a line structured light; subjecting the tire contour image to an image processing module and obtaining a light stripe center line; analyzing the tire contour image at the same time to identify a tire contour curve; further identifying tire pattern and the position of the tire pattern targeted at the tire contour curve; conducting coordinate computing on the pattern position to obtain a pattern depth; acquiring a laser cross-section contour light strip which is formed on the tire surface by a line laser; using a CCD camera and computing tire contour information and generating a complete contour image. By obtaining the pattern depth of the captured tire contour image, sampling of a test sensor and a to-be-tested tire are conducted in a non-contact manner during the entire test and the entire test can be conducted automatically, so that the method has excellent robustness and is conducive for future maintenance and repair of a vehicle, such as wheel positioning.

Description

Technical field [0001] The invention relates to the technical field of machine vision measurement, in particular to a line structured light machine vision tire wear measurement method. Background technique [0002] The main function of the tread pattern of automobile tires is to increase the friction between the tread and the road surface, and eliminate the accumulation of water to prevent the wheels from slipping. The tire pattern improves the ground contact elasticity of the tread. The tangential force between the tread and the road surface (such as driving force, Under the action of braking force and lateral force), the pattern can produce greater tangential elastic deformation. As the tangential force increases, the tangential deformation increases, and the "friction effect" of the contact surface is also increased, thereby suppressing the slipping or slipping trend of the tread and the road surface. This largely eliminates the shortcomings of non-patterned (smooth tread) ti...

AI Technical Summary

Problems solved by technology

[0003] The existing tire wear measurement method generally adopts the method of visual inspection. This method evaluates people's intuitive judgment, and the human factor is very large, so the accuracy cannot be guaranteed.

Another method of measuring tire wear is to measure the tread depth. This method is mainly performed by the inspector using a tire tread depth gauge for contact measurement. Due to the operation method of the inspector and the error of the tire tread depth gauge itself, the measurement will be incorrect. Large errors occur in the data, and the manual measurement efficiency is low, which seriously restricts the work efficiency of the automobile inspection line

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