DocumentCode :
967249
Title :
Nighttime Vehicle Distance Measuring Systems
Author :
Wang, Wei-Yen ; Lu, Ming-Chih ; Kao, Hung Lin ; Chu, Chun-Yen
Author_Institution :
Inst. of Autom. Technol., Nat. Taipei Univ. of Technol.
Volume :
54
Issue :
1
fYear :
2007
Firstpage :
81
Lastpage :
85
Abstract :
In this brief, a nighttime vehicle distance measuring system using charge-coupled device (CCD) cameras is proposed. The authors use the proportionality of similar triangles to measure the distance between a CCD camera and taillights of a vehicle in front. At night, the taillights form two bright spots in the CCD image, therefore producing two measurable signals. A circuit for counting the number of external clock pulses between the two bright spots is employed to calculate the interval between them in the video image. Due to the proportionality of similar triangles, there is a linear relationship between the actual distance and the interval of the two taillights. Thus, the actual distance from the CCD camera to the vehicle can be calculated from a simple formula. One does not have to use an expensive high-speed digital signal processing microprocessor to identify the taillights of the vehicle or use pixels to measure distance, but just use simple circuits to identify the taillights at night and use a simple formula to measure distance. Experimental results demonstrate the effectiveness of the proposed system
Keywords :
CCD image sensors; comparators (circuits); distance measurement; CCD camera; CCD image; charge-coupled device cameras; digital signal processing microprocessor; external clock pulses; nighttime vehicle distance measuring systems; voltage comparator; Automotive engineering; Charge coupled devices; Charge-coupled image sensors; Circuits; Clocks; Distortion measurement; Optical reflection; Reflectivity; Ultrasonic variables measurement; Vehicles; Distance measuring systems; proportionality of similar triangles; voltage comparator;
fLanguage :
English
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
Publisher :
ieee
ISSN :
1549-7747
Type :
jour
DOI :
10.1109/TCSII.2006.882223
Filename :
4063483
Link To Document :
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