License Plate Recognition From Still Images and Video Sequences: A Survey

License plate recognition (LPR) algorithms in images or videos are generally composed of the following three processing steps: 1) extraction of a license plate region; 2) segmentation of the plate characters; and 3) recognition of each character. This task is quite challenging due to the diversity o...

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Published inIEEE transactions on intelligent transportation systems Vol. 9; no. 3; pp. 377 - 391
Main Authors Anagnostopoulos, Christos-Nikolaos E., Anagnostopoulos, Ioannis E., Psoroulas, Ioannis D., Loumos, Vassili, Kayafas, Eleftherios
Format Journal Article
LanguageEnglish
Published Piscataway, NJ IEEE 01.09.2008
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Online AccessGet full text
ISSN1524-9050
1558-0016
DOI10.1109/TITS.2008.922938

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Abstract License plate recognition (LPR) algorithms in images or videos are generally composed of the following three processing steps: 1) extraction of a license plate region; 2) segmentation of the plate characters; and 3) recognition of each character. This task is quite challenging due to the diversity of plate formats and the nonuniform outdoor illumination conditions during image acquisition. Therefore, most approaches work only under restricted conditions such as fixed illumination, limited vehicle speed, designated routes, and stationary backgrounds. Numerous techniques have been developed for LPR in still images or video sequences, and the purpose of this paper is to categorize and assess them. Issues such as processing time, computational power, and recognition rate are also addressed, when available. Finally, this paper offers to researchers a link to a public image database to define a common reference point for LPR algorithmic assessment.
AbstractList License plate recognition (LPR) algorithms in images or videos are generally composed of the following three processing steps: 1) extraction of a license plate region; 2) segmentation of the plate characters; and 3) recognition of each character. This task is quite challenging due to the diversity of plate formats and the nonuniform outdoor illumination conditions during image acquisition. Therefore, most approaches work only under restricted conditions such as fixed illumination, limited vehicle speed, designated routes, and stationary backgrounds. Numerous techniques have been developed for LPR in still images or video sequences, and the purpose of this paper is to categorize and assess them. Issues such as processing time, computational power, and recognition rate are also addressed, when available. Finally, this paper offers to researchers a link to a public image database to define a common reference point for LPR algorithmic assessment.
License plate recognition (LPR) algorithms in images or videos are generally composed of the following three processing steps: 1) extraction of a license plate region; 2) segmentation of the plate characters; and 3) recognition [abstract truncated by publisher].
Author Anagnostopoulos, Ioannis E.
Loumos, Vassili
Kayafas, Eleftherios
Anagnostopoulos, Christos-Nikolaos E.
Psoroulas, Ioannis D.
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Issue 3
Keywords license plate recognition (LPR)
optical character recognition (OCR)
Image processing
license plate identification
license plate segmentation
Registration (vehicle)
Segmentation
Image databank
Outdoor installation
Video signal
Algorithmics
Processing time
Pattern recognition
Character recognition
Stationary condition
Plate
Luminance
Optical character recognition
Image sequence
Fixed image
Illumination
Language English
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Snippet License plate recognition (LPR) algorithms in images or videos are generally composed of the following three processing steps: 1) extraction of a license plate...
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SubjectTerms Algorithms
Applied sciences
Artificial intelligence
Character recognition
Computer science; control theory; systems
Control theory. Systems
Exact sciences and technology
Ground, air and sea transportation, marine construction
Illumination
Image databases
Image processing
Image recognition
Image segmentation
Information systems. Data bases
Intelligent transportation systems
Intelligent vehicles
license plate identification
License plate recognition
license plate recognition (LPR)
license plate segmentation
Licenses
Lighting
Memory organisation. Data processing
Nonuniform
optical character recognition (OCR)
Optical character recognition software
Pattern recognition. Digital image processing. Computational geometry
Recognition
Robotics
Software
Video sequences
Title License Plate Recognition From Still Images and Video Sequences: A Survey
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