Blob detection and filtering for character segmentation of license plates

This paper presents a character segmentation method to address automatic number plate recognition problem. The method considered pixel intensity, character appearance, and arrangement of characters altogether to segment character regions. The method firstly discovers candidate blobs of characters by using connected component analysis and appearance-based character detection. A character recognizer is used for removing redundant and noisy blobs. Then, a trained classifier selects character blobs among the candidates by examining arrangement of the blobs. Experimental results show an achievement of 98.3% of segmentation rate, which prove the effectiveness of our method.

[1]  Kuo-Chin Fan,et al.  A Novel Character Segmentation Method for Text Images Captured by Cameras , 2010 .

[2]  Cheng-Lin Liu,et al.  Handwritten digit recognition: benchmarking of state-of-the-art techniques , 2003, Pattern Recognit..

[3]  Paul A. Viola,et al.  Robust Real-time Object Detection , 2001 .

[4]  Changshui Zhang,et al.  A new algorithm for character segmentation of license plate , 2003, IEEE IV2003 Intelligent Vehicles Symposium. Proceedings (Cat. No.03TH8683).

[5]  Andy C. Downton,et al.  A comparison of binarization methods for historical archive documents , 2005, Eighth International Conference on Document Analysis and Recognition (ICDAR'05).

[6]  Hsi-Jian Lee,et al.  A Cascade Framework for a Real-Time Statistical Plate Recognition System , 2007, IEEE Transactions on Information Forensics and Security.

[7]  Paul A. Viola,et al.  Robust Real-Time Face Detection , 2001, International Journal of Computer Vision.

[8]  Sei-Wang Chen,et al.  Automatic license plate recognition , 2004, IEEE Transactions on Intelligent Transportation Systems.

[9]  Hsi-Jian Lee,et al.  Detection and recognition of license plate characters with different appearances , 2003, Proceedings of the 2003 IEEE International Conference on Intelligent Transportation Systems.

[10]  Fernando Martín,et al.  NEW METHODS FOR AUTOMATIC READING OF VLP's (VEHICLE LICENSE PLATES) , 2002 .

[11]  Qingming Huang,et al.  A configurable method for multi-style license plate recognition , 2009, Pattern Recognit..

[12]  Hiroshi Kawakami,et al.  A novel adaptive morphological approach for degraded character image segmentation , 2005, Pattern Recognit..

[13]  Ioannis Anagnostopoulos,et al.  A License Plate-Recognition Algorithm for Intelligent Transportation System Applications , 2006, IEEE Transactions on Intelligent Transportation Systems.

[14]  Jin Hyuk Choi,et al.  Precise Detection of Car License Plates by Locating Main Characters , 2010 .

[15]  Youngwoo Yoon,et al.  Blob extraction based character segmentation method for automatic license plate recognition system , 2011, 2011 IEEE International Conference on Systems, Man, and Cybernetics.

[16]  Qiang Wu,et al.  Segmentation of characters on car license plates , 2008, 2008 IEEE 10th Workshop on Multimedia Signal Processing.

[17]  Pengfei Shi,et al.  An Algorithm for License Plate Recognition Applied to Intelligent Transportation System , 2011, IEEE Transactions on Intelligent Transportation Systems.