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Vol. 165, Issue 2, February 2014, pp. 61-67

 

Bullet

 

An Automatic Wheel Contour Extraction Method
 

1 Hui Zeng, 2 Han Wu, 3 Xiuqing Wang

1 School of Automation and Electrical Engineering University of Science and Technology Beijing, Beijing 100083, China
2 China National Computer Products Quality Supervising Test Center, Beijing 100083, China
3 Vocational & Technical Institute, Hebei Normal University, Shijiazhuang 050031, China

1 E-mail: hzeng@163.com

 

Received: 18 October 2013 /Accepted: 28 January 2014 /Published: 28 February 2014

Digital Sensors and Sensor Sysstems

 

Abstract: Wheel contour extraction from image is an important unit of any vision-based traffic accident analysis system, and automatically doing it is still a difficult task due to various distracting factors such as low contrast between the wheel and the ground, different wheel types and various weather conditions etc. In this work, a new automatic wheel extraction method is proposed, in which rather than directly extracting wheel contours from images, the wheel rim and the contacting image point of wheel to the ground are at first extracted, then the wheel contour is in turn located via the invariance of cross ratio. Extensive experiments under various weather conditions show that our proposed method is capable of detecting wheel contours fully automatically and robustly.

 

Keywords: Wheel contour, Wheel rim, Contacting image point, Harmonic conjugate, Cross ratio.

 

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