The Extraction of Vehicle License Plate Region Using Edge Directional Properties of Wavelet Subband

Sung Wook PARK  Su Cheol HWANG  Jong Wook PARK  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E86-D   No.3   pp.664-669
Publication Date: 2003/03/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Image Processing, Image Pattern Recognition
Keyword: 
extraction of vehicle license plate,  wavelet subband,  wavelet decomposition,  edge directional property,  

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Summary: 
Changing vehicle structures and backgrounds makes it very difficult to correctly extract a license plate region from a vehicle image. In this paper, we propose a simple method to extract the license plate region using edge properties of wavelet subband. The High Frequency Subband (HFS) of an image has edge information for each direction. Edge information is concentrated in each direction of the Headlight-Radiator-Headlight (H-R-H) and the license plate region compared to other regions in the vehicle image. This paper shows a license plate region extraction method using these edge properties and our experimental results with various vehicle images.