Automatic license plate detection using vertical edge detection method

This paper proposes a faster mechanism for license plate detection. Usually license plate has more vertical edges compared to horizontal edge. By focusing on this concept an algorithm called VEDA is used here. First convert the color image into gray image. Then for binarizing the image a technique called adaptive thresholding (AT) is used. The noise in the image is removed by using ULEA algorithm. Then the proposed VEDA is used to extract the vertical edges. Then HDD algorithm is used for highlighting the license plate area. Compared to other edge detection mechanisms such as SOBEL and CANNY, VEDA has lesser complexity. Also the computation time is also less for VEDA when compared against SOBEL.

[1]  Derek Bradley,et al.  Adaptive Thresholding using the Integral Image , 2007, J. Graph. Tools.

[2]  Lin Luo,et al.  An Efficient Method of License Plate Location , 2009, 2009 First International Conference on Information Science and Engineering.

[3]  Subramaniam Ganesan,et al.  An efficient implementation of the Hough transform for detecting vehicle license plates using DSP'S , 1995, Proceedings Real-Time Technology and Applications Symposium.

[4]  A. Gokulanathan,et al.  Vertical-Edge-Based Car-License-Plate Detection Method , 2017 .

[5]  Sunghoon Kim,et al.  A robust license-plate extraction method under complex image conditions , 2002, Object recognition supported by user interaction for service robots.

[6]  Mei Yu,et al.  An approach to Korean license plate recognition based on vertical edge matching , 2000, Smc 2000 conference proceedings. 2000 ieee international conference on systems, man and cybernetics. 'cybernetics evolving to systems, humans, organizations, and their complex interactions' (cat. no.0.

[7]  Muhammad Sarfraz,et al.  Saudi Arabian license plate recognition system , 2003, 2003 International Conference on Geometric Modeling and Graphics, 2003. Proceedings.

[8]  Sung-Il Chien,et al.  Automatic car license plate extraction using modified generalized symmetry transform and image warping , 2001, ISIE 2001. 2001 IEEE International Symposium on Industrial Electronics Proceedings (Cat. No.01TH8570).

[9]  Guixiang Liu,et al.  The Calculation Method of Road Travel Time Based on License Plate Recognition Technology , 2011 .

[10]  M MarioI.Chacón,et al.  License plate location based on a dynamic PCNN scheme , 2003 .

[11]  Lawrence W. Lan,et al.  Optimal Locations of License Plate Recognition to Enhance the Origin-Destination Matrix Estimation , 2012 .

[12]  Duong Anh Duc,et al.  Combining Hough transform and contour algorithm for detecting vehicles' license-plates , 2004, Proceedings of 2004 International Symposium on Intelligent Multimedia, Video and Speech Processing, 2004..

[13]  Abdul Rahman Ramli,et al.  Vertical-Edge-Based Car-License-Plate Detection Method , 2013, IEEE Transactions on Vehicular Technology.

[14]  Thomas M. Breuel,et al.  Efficient implementation of local adaptive thresholding techniques using integral images , 2008, Electronic Imaging.

[15]  Hsi-Jian Lee,et al.  Extraction and recognition of license plates of motorcycles and vehicles on highways , 2004, Proceedings of the 17th International Conference on Pattern Recognition, 2004. ICPR 2004..

[16]  Pierre Wellner,et al.  Adaptive Thresholding for the DigitalDesk , 1993 .

[17]  A. Çapar,et al.  License Plate Recognition From Still Images and Video Sequences: A Survey , 2008, IEEE Transactions on Intelligent Transportation Systems.