NDLI: Algorithm for multinational license plate localization and character segmentation

Content Provider	IEEE Xplore Digital Library
Author	Mo Shiying Zhou Weixin Lv Na'na Sun Yaxin Huang Wen
Copyright Year	2011
Description	Author affiliation: School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006 China (Mo Shiying; Zhou Weixin; Lv Na'na; Sun Yaxin; Huang Wen)
Abstract	As the difference of gray value between the numbers and letters on the license plate and the license plate background is very big. We first use region growing algorithm based on the gray value to separate each number and letter into different area. Secondly, we search for the bounding rectangles of all regions and find some rectangular sequences that meet a special condition. Thirdly, calculate the horizon bias for all rectangles according to the coordination of the up-right point in the rectangle, adjust and get the precise location of each rectangle. Forth, we get the binary image which can separate the numbers and letters on the license plates and the license plate background by the dynamic threshold algorithm. The relation of the maximum width of various license plate numbers and letters and its bounding rectangles helps to count the direction of the vertical bias, then the bias is adjusted. At last we statistic the foreground vertical histogram of the previous results, and get the result of precise vertical position and character segmentation. The experimental results show that this algorithm performs well for location of multi-national license plates.
Starting Page	85
Ending Page	89
File Size	219803
Page Count	5
File Format	PDF
ISBN	9781424481583
e-ISBN	9781424481613
DOI	10.1109/ICEMI.2011.6037861
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-08-16
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	license plate correction Image color analysis Heuristic algorithms Image edge detection Instruments character segmentation Licenses Educational institutions license plate location Vehicles
Content Type	Text
Resource Type	Article

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