Author:
Cai Nian,Chen Yuchao,Liu Gen,Cen Guandong,Wang Han,Chen Xindu
Abstract
Purpose
This paper aims to design an automatic inspection system for the characters on tire molds, which involves a vision-based inspection method for the characters on tire molds.
Design/methodology/approach
An automatic inspection equipment is designed according to the features of the tire mold. To implement the inspection task, the corresponding image processing methods are designed, including image preprocessing, image mosaic, image locating and character inspection. Image preprocessing mainly contains fitting the contours of the acquired tire mold images and those of the computer aided design (CAD) as the arcs of two circles and polar transformation of the acquired images and the CAD. Then, the authors propose a novel framework to locate the acquired images into the corresponding mosaicked tire mold image. Finally, a character inspection scheme is proposed by combining an support-vector-machine-based character recognition method and a string matching approach. At the stages of image locating and character inspection, image mosaic is simultaneously used to label the defects in the mosaicked tire mold image, which is based on histograms-of-gradients features.
Findings
The experimental results indicate that the designed automatic inspection system can inspect the characters on the tire mold with a high accuracy at a reasonable time consumption.
Practical implications
The designed automatic inspection system can detect the carving faults for the characters on the tire molds, which are the cases that the characters are wrongly added, deleted or modified on the tire mold.
Originality/value
To the best of the authors’ knowledge, this is the first automatic vision-based inspection system for the characters on tire molds. An inspection equipment is designed and many novel image processing methods are proposed to implement the inspection task. The designed system can be widely applied in the industry.
Subject
Industrial and Manufacturing Engineering,Control and Systems Engineering
Reference18 articles.
1. A font and size-independent OCR system for printed Kannada documents using support vector machines;Sadhana,2002
2. A CAD-based computer vision system;Image and Vision Computing,1998
3. New IC solder joint inspection method for an automatic optical inspection system based on an improved visual background extraction algorithm;IEEE Transactions on Components, Packaging and Manufacturing Technology,2016
4. Fuzzy template matching for printing character inspection;WSEAS Transactions on Circuits and Systems,2004
5. Histograms of oriented gradients for human detection,2005
Cited by
5 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献