Adaptive Thresholding Technique for Binarization of License Plate Images
Journal of the Optical Society of Korea, Vol. 14, Issue 4, pp. 368-375 (2010)
Acrobat PDF (1572 KB)
Abstract
Unlike document images, license plate images are mostly captured under uneven lighting conditions. In particular, a shadowed region has sharp intensity variation and sometimes that region has very high intensity by reflected light. This paper presents a new technique for thresholding license plate images. This approach consists of three parts. In the first part, it performs a rough thresholding and classifies the type of license plate to adjust some parameters optimally. Next, it identifies a shadow type and binarizes license plate images by adjusting the window size and location according to the shadow type. And finally, post-processing based on the cluster analysis is performed. Experimental results show that the proposed method outperformed five well-known methods.
© 2010 Optical Society of Korea
OCIS Codes
(070.4560) Fourier optics and signal processing : Data processing by optical means
(070.5010) Fourier optics and signal processing : Pattern recognition
(100.2000) Image processing : Digital image processing
(110.2960) Imaging systems : Image analysis
History
Original Manuscript: October 15, 2010
Revised Manuscript: December 7, 2010
Manuscript Accepted: December 8, 2010
Published: December 25, 2010
Citation
Min-Ki Kim, "Adaptive Thresholding Technique for Binarization of License Plate Images," J. Opt. Soc. Korea 14, 368-375 (2010)
http://www.opticsinfobase.org/josk/abstract.cfm?URI=josk-14-4-368
Cited By |
OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.
Related Journal Articles 
- Nondispersive wavelength-division sampling (OL)
- All-incoherent dispersion-compensated optical correlator (OL)
- Synthetic aperture radar image correlation by use of preprocessing for enhancement of scattering centers (OL)
- All-Digital Ring–Wedge Detector Applied to Image Quality Assessment (AO)
- Palmprint Verification Using Multi-scale Gradient Orientation Maps (JOSK)
Related Conference Papers
« Previous Article | Next Article »
OSA is a member of 