A constraint based real-time license plate recognition system

Download

index.pdf

Date

2007

Author

Günaydın, Ali Gökay

Metadata

Show full item record

Item Usage Stats

232
views

102
downloads

License Plate Recognition (LPR) systems are frequently utilized in various access controls and security applications. In this thesis, an experimental constraint based real-time License Plate Recognition system is designed, and implemented in Java platform. Many of the available constraint based methods worked under strict restrictions such as plate color, fixed illumination and designated routes, whereas, only the license plate geometry and format constraints are used in this developed system. These constraints are built on top of the current Turkish license plate regulations. The plate localization algorithm is based on vertical edge features where constraints are used to filter out non-text regions. Vertical and horizontal projections are used for character segmentation and Multi Layered Perceptron (MLP) based Optical Character Recognition (OCR) module has been implemented for character identification. The extracted license plate characters are validated against possible license plate formats during the recognition process. The system is tested both with Turkish and foreign license plate images including various plate orientation, image quality and size. An accuracy of 92% is achieved for license plate localization and %88 for character segmentation and recognition.

Subject Keywords

EComputer Engineering., Computer Hardware.

URI

http://etd.lib.metu.edu.tr/upload/12608195/index.pdf
https://hdl.handle.net/11511/16674

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

A simulation study of ad hoc networking of UAVs with opportunistic resource utilization networks Lilien, Leszek T.; BEN OTHMANE, Lotfi; Angın, Pelin; DECARLO, Andrew; Salih, Raed M.; BHARGAVA, Bharat (Elsevier BV, 2014-02-01) Specialized ad hoc networks of unmanned aerial vehicles (UAVs) have been playing increasingly important roles in applications for homeland defense and security. Common resource virtualization techniques are mainly designed for stable networks; they fall short in providing optimal performance in more dynamic networks such as mobile ad hoc networks (MANETs)-due to their highly dynamic and unstable nature. We propose application of Opportunistic Resource Utilization Networks (Oppnets), a novel type of MANETs, ...
A DUAL MODALITY IMAGING-SYSTEM FOR IMPEDANCE TOMOGRAPHY WITH ULTRASONICALLY DETERMINED BOUNDARIES IDER, YZ; DORKEN, E; Gençer, Nevzat Güneri; KOYMEN, H (1989-11-12) Hardware and software for a dual modality imaging system is developed, and the system is applied to data obtained from phantoms. Static impedance tomographic images of translationally symmetric structures are reconstructed. For this purpose the positions of the electrodes placed around the cross section are determined by the ultrasonic time-of-flight measurements. The contrast resolution of the existing system is found to be 20% and the spatial resolution is about 10% of the average diameter of the cross se...
A robust traffic sign recognition system Becer, Hüseyin Caner; Bulut, Mehmet Mete; Akar, Gözde; Department of Electrical and Electronics Engineering (2011) The traffic sign detection and recognition system is an essential part of the driver warning and assistance systems. In this thesis, traffic sign recognition system is studied. We considered circular, triangular and square Turkish traffic signs. For detection stage, we have two different approaches. In first approach, we assume that the detected signs are available. In the second approach, the region of interest of the traffic sign image is given. Traffic sign is extracted from ROI by using a detection algo...
An algorithm for multiscale license plate detection and rule-based character segmentation Karalı, Ali Onur; Ulusoy, İlkay; Department of Electrical and Electronics Engineering (2011) License plate recognition (LPR) technology has great importance for the development of Intelligent Transportation Systems by automatically identifying the vehicles using image processing and pattern recognition techniques. Conventional LPR systems consist of license plate detection (LPD), character segmentation (CS) and character recognition (CR) steps. Successful detection of license plate and character locations have vital role for proper LPR. Most LPD and CS techniques in the literature assume fixed dist...
Automatic license plate recognition system location selection Gör, Buğra; Karakaya, Gülşah; Department of Business Administration (2018) With the help of advancements on sensor and data transfer technologies, the usage area of Automatic License Plate Recognition (ALPR) Systems has been enlarged. Both public and private sectors implement ALPR applications for their respective needs. Public safety ALPR applications aim to monitor and control traffic data at both individual and collective levels. For this reason, to build an efficient sensor network number and location of ALPR systems should be determined optimally. This study focuses on determ...

Citation Formats

A. G. Günaydın, “A constraint based real-time license plate recognition system,” M.S. - Master of Science, Middle East Technical University, 2007.