CAAI Transactions on
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Symmetry features for license plate classification
Karpuravalli Srinivas Raghunandan ; Palaiahnakote Shivakumara* ; Lolika Padmanabhan; Govindaraju Hemantha Kumar ; Tong Lu ; Umapada Pal
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Affiliations:

Karpuravalli Srinivas Raghunandan, Govindaraju Hemantha Kumar: Department of Studies in Computer Science, University of Mysore, Karnataka, India

Palaiahnakote Shivakumara: Faculty of Computer Science and Information Technology, University of Malaya, Kuala Lumpur, Malaysia

Lolika Padmanabhan: PES Institute of Technology, Bangalore, Karnataka, India

Tong Lu: National Key Lab for Novel Software Technology, Nanjing University, Nanjing, People’s Republic of China

Umapada Pal: Computer Vision and Pattern Recognition Unit, Indian Statistical Institute, Kolkata, India

 

Email:

Palaiahnakote Shivakumara: E-mail: shiva@um.edu.my

 

Under the Creative Commons Attribution-NoDerivs License

Open Access funded by Chongqing University of Technology
DOI: 10.1049/trit.2018.1016
Received 20/07/2018, Accepted 21/07/2018, Published 23/07/2018

Abstract

Achieving high recognition rate for license plate images is challenging due to multi-type images. We present new symmetry features based on stroke width for classifying each input license image as private, taxi, cursive text, when they expand the symbols by writing and non-text such that an appropriate optical character recognition (OCR) can be chosen for enhancing recognition performance. The proposed method explores gradient vector flow (GVF) for defining symmetry features, namely, GVF opposite direction, stroke width distance, and stroke pixel direction. Stroke pixels in Canny and Sobel which satisfy the above symmetry features are called local candidate stroke pixels. Common stroke pixels of the local candidate stroke pixels are considered as the global candidate stroke pixels. Spatial distribution of stroke pixels in local and global symmetry are explored by generating a weighted proximity matrix to extract statistical features, namely, mean, standard deviation, median and standard deviation with respect the median. The feature matrix is finally fed to an support vector machine (SVM) classifier for classification. Experimental results on large datasets for classification show that the proposed method outperforms the existing methods. The usefulness and effectiveness of the proposed classification is demonstrated by conducting recognition experiments before and after classification.

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