Title :
Method for recognition of numbers on speed limit signs utilizing an eigen space method based on the KL transform
Author :
Miyata, Sumiko ; Takehara, S. ; Sakai, Hiroki ; Ishikawa, Takaaki
Author_Institution :
Dept. of Intell. Mech. Eng., Kink U., Higashi-Hiroshima, Japan
Abstract :
This study explains that a method utilizing the eigen spaces obtained by the KL transform for automatic recognition by camera of the speed on a speed limit sign has the following advantages: it is robust in response to changes in intensity patterns caused by the direction the sign is facing and by the amount of light striking the sign, and it is able to reduce the recognition processing time by reducing the number of feature vector dimensions during analysis. The method for recognition of traffic signs previously proposed by the authors of this study was a method for recognition based on extracting geometric shapes from the sign and recognizing them based on their aspect ratios. As such, this method was not able to identify the numbers on a speed limit sign, all of which have identical aspect ratios. It will be shown that the method in this study is able to recognize nearly all speed limits indicated on traffic signs within several 100s of ms after image acquisition. This method was applied to still images and its effectiveness was verified from the perspective of the following requirements for providing accurate information concerning the vehicle surroundings to the driver: high processing speed, high recognition accuracy, detection of all detectable objects without omission, and robustness in response to changes in the surrounding environment and to geometric changes in the sign image as the vehicle approaches it.
Keywords :
computational geometry; eigenvalues and eigenfunctions; feature extraction; object recognition; shape recognition; traffic engineering computing; transforms; KL transform; automatic recognition; camera; eigen space method; feature vector dimensions; geometric shape extraction; image acquisition; intensity patterns; number recognition; processing speed; recognition accuracy; recognition processing time; sign image; speed limit signs; vehicle; Cameras; Feature extraction; Image recognition; Pattern recognition; Transforms; Vectors; Vehicles; Computer vision; Eigen space method; Feature extraction; Image processing; KL transform; Pattern recognition; Traffic sign;
Conference_Titel :
Control Automation Robotics & Vision (ICARCV), 2012 12th International Conference on
Conference_Location :
Guangzhou
Print_ISBN :
978-1-4673-1871-6
Electronic_ISBN :
978-1-4673-1870-9
DOI :
10.1109/ICARCV.2012.6485188