• Title/Summary/Keyword: License

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Multi-Style License Plate Recognition System using K-Nearest Neighbors

  • Park, Soungsill;Yoon, Hyoseok;Park, Seho
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.13 no.5
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    • pp.2509-2528
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    • 2019
  • There are various styles of license plates for different countries and use cases that require style-specific methods. In this paper, we propose and illustrate a multi-style license plate recognition system. The proposed system performs a series of processes for license plate candidates detection, structure classification, character segmentation and character recognition, respectively. Specifically, we introduce a license plate structure classification process to identify its style that precedes character segmentation and recognition processes. We use a K-Nearest Neighbors algorithm with pre-training steps to recognize numbers and characters on multi-style license plates. To show feasibility of our multi-style license plate recognition system, we evaluate our system for multi-style license plates covering single line, double line, different backgrounds and character colors on Korean and the U.S. license plates. For the evaluation of Korean license plate recognition, we used a 50 minutes long input video that contains 138 vehicles of 6 different license plate styles, where each frame of the video is processed through a series of license plate recognition processes. From two experiments results, we show that various LP styles can be recognized under 50 ms processing time and with over 99% accuracy, and can be extended through additional learning and training steps.

A Study on Vehicle License Plate Recognition System through Fake License Plate Generator in YOLOv5 (YOLOv5에서 가상 번호판 생성을 통한 차량 번호판 인식 시스템에 관한 연구)

  • Ha, Sang-Hyun;Jeong, Seok Chan;Jeon, Young-Joon;Jang, Mun-Seok
    • Journal of the Korean Society of Industry Convergence
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    • v.24 no.6_2
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    • pp.699-706
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    • 2021
  • Existing license plate recognition system is used as an optical character recognition method, but a method of using deep learning has been proposed in recent studies because it has problems with image quality and Korean misrecognition. This requires a lot of data collection, but the collection of license plates is not easy to collect due to the problem of the Personal Information Protection Act, and labeling work to designate the location of individual license plates is required, but it also requires a lot of time. Therefore, in this paper, to solve this problem, five types of license plates were created using a virtual Korean license plate generation program according to the notice of the Ministry of Land, Infrastructure and Transport. And the generated license plate is synthesized in the license plate part of collectable vehicle images to construct 10,147 learning data to be used in deep learning. The learning data classifies license plates, Korean, and numbers into individual classes and learn using YOLOv5. Since the proposed method recognizes letters and numbers individually, if the font does not change, it can be recognized even if the license plate standard changes or the number of characters increases. As a result of the experiment, an accuracy of 96.82% was obtained, and it can be applied not only to the learned license plate but also to new types of license plates such as new license plates and eco-friendly license plates.

Multi-National Integrated Car-License Plate Recognition System Using Geometrical Feature and Hybrid Pattern Vector

  • Lee, Su-Hyun;Seok, Young-Soo;Lee, Eung-Joo
    • Proceedings of the IEEK Conference
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    • 2002.07b
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    • pp.1256-1259
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    • 2002
  • In this paper, we have proposed license plate recognition system for multi-national vehicle license plate using geometric features along with hybrid and seven segment pattern vectors. In the proposed system, we suggested to find horizontal and vertical relation after going through preparation process with inputted real-time license plate image of Korea and Japan, and then to classify license plate with using characteristic and geometric information of license plates. It classifies the extracted license plate images into letters and numbers, such as local name, local number, classification character and license consecutive numbers, and recognize license plate of Korea and Japan by applying hybrid and seven segments pattern vectors to classified letter and number region. License plate extraction step of the proposed system uses width and length information along with relative rate of Korean and Japanese license plate. Moreover, it exactly segmentation by letters with using each letter and number position information within license plate region, and recognizes Korean and Japanese license plates by applying hybrid and seven segment pattern vectors, containing characteristics related to letter size and movement within segmented letter area. As the result of testing the proposed system in real experiment, it recognized regardless of external lighting conditions as well as classifying license plates by nations, Korea and Japan. We have developed a system, recognizing regardless of inputted structural character of vehicle licenses and external environment.

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Design and Implementation of Management Systems for Software License (소프트웨어 라이선스 관리시스템의 설계 및 구현 : K사 사례를 중심으로)

  • Kang, Yong-Sik;Kwon, Sun-Dong;Ko, Mi-Hyun
    • Journal of Information Technology Applications and Management
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    • v.20 no.3_spc
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    • pp.315-331
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    • 2013
  • As the business has been highly informatized, many companies has bought the software for their works. There are two types of software license. One is a site license and the other is a user license. This paper is focused on the user license. User license has the number of the right to use software. So, software managers always need to know the number of licenses in use and should limit the number of software license in use. If someone in the company use a software without license, he will be treated as a piracy. In that case, the company should pay for the settlement cost for the exceeding license use. In this paper, we suggest the model how we can limit the installation of the software within the number of licenses by license management system.

The Study on the Automobile License Plate for the improvement of Readability in Korea (판독성 향상을 위한 자동차 번호판의 개선에 관한 연구)

  • Lee, Chang-Min;Lee, Yun-Hong
    • IE interfaces
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    • v.14 no.3
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    • pp.296-301
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    • 2001
  • The focus of this study is to redesign the Korean license plate by comparing the USA's plate with European plate formed by 1-line system in order to increase a read rate of Korea license plate. And we have compared the read rate of the new design license plate with that of the present license plate and that of the license plate studied so far. As an experimental method (used in a precedent research), we use three kinds of methods that are the measurement of the read-distance, the measurement reading-rate under the short-term exposure and the measurement of the reading-rate when driving. First, three kinds of measurements for plates of five nations are performed. Then we redesign the new Korean license plate under the base of read rates obtained by five nation's plate. As alternatives, we choose five license plates. Those alternatives are the redesigned license plate, the present license plate, the license plate studied so far, and two types of eternity license plates made by the Korea Transport Institute. When we compare results of the read-distance, there is no significant in term of different the read-distance between the alternatives. But there is a significant difference in term of the misreading-rate and the read-rate when diving. Therefore, it is necessary to redesign the present license plates because of a high misreading-rate.

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Characteristics and Working Status of Dual Medical License Holders having the Medical Doctor and the Korean Medicine Doctor license in Korea (의사.한의사 복수면허자의 특성 및 근무현황에 대한 조사 연구)

  • Choi, Byung-Hee;Han, Gyung-Yeon;Lim, Byung-Mook;Jeong, Min-Jeong;Yun, Young-Ju
    • Journal of Society of Preventive Korean Medicine
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    • v.15 no.1
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    • pp.117-130
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    • 2011
  • Objectives : This study was performed to investigate the status of dual medical license holders who have both the medical doctor (MD) and the Korean medicine doctor (KMD) license in Korea, and provide basic data for developing the cooperational strategy between conventional western medicine and traditional Korean medicine. Methods : The questionnaires on the general characteristics and working status were developed and administered for both dual license holders and medical students with MD or KMD license. The data of 187 persons were collected and analyzed. Results : Mean age of dual medical license holders is $42.28{\pm}6.54$ and most of them are male(86.0%). 75.2% of them obtained MD license first. However among the students who had MD or KMD license, 73.7% had KMD license. The mean time for obtaining the additional license was $10.11{\pm}4.905$ year. Forty nine dual license holders are opening both medical clinic and Korean medicine clinic. Conclusions : To promote the role of dual license holders for collaborating traditional Korean medicine and western medicine, developing an integrative medical curriculum should be enhanced, and the studies investigating the practice characteristics, and self-consciousness of dual license holders are required.

Robust Motorbike License Plate Detection and Recognition using Image Warping based on YOLOv2 (YOLOv2 기반의 영상워핑을 이용한 강인한 오토바이 번호판 검출 및 인식)

  • Dang, Xuan-Truong;Kim, Eung-Tae
    • Journal of Broadcast Engineering
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    • v.24 no.5
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    • pp.713-725
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    • 2019
  • Automatic License Plate Recognition (ALPR) is a technology required for many applications such as Intelligent Transportation Systems and Video Surveillance Systems. Most of the studies have studied were about the detection and recognition of license plates on cars, and there is very little about detecting and recognizing license plates on motorbikes. In the case of a car, the license plate is located at the front or rear center of the vehicle and is a straight or slightly sloped license plate. Also, the background of the license plate is mainly monochromatic, and license plate detection and recognition process is less complicated. However since the motorbike is parked by using a kickstand, it is inclined at various angles when parked, so the process of recognizing characters on the motorbike license plate is more complicated. In this paper, we have developed a 2-stage YOLOv2 algorithm to detect the area of a license plate after detection of a motorbike area in order to improve the recognition accuracy of license plate for motorbike data set parked at various angles. In order to increase the detection rate, the size and number of the anchor boxes were adjusted according to the characteristics of the motorbike and license plate. Image warping algorithms were applied after detecting tilted license plates. As a result of simulating the license plate character recognition process, the proposed method had the recognition rate of license plate of 80.23% compared to the recognition rate of the conventional method(YOLOv2 without image warping) of 47.74%. Therefore, the proposed method can increase the recognition of tilted motorbike license plate character by using the adjustment of anchor boxes and the image warping which fit the motorbike license plate.

A Study on the Understanding of Multi Pilot License and its Introduction Plan (부조종사 자격증명(MPL: Multi-Crew Pilot License)의 이해와 도입 방안에 관한 연구)

  • Hwang, Jae-Gab;Yoo, Byeong-Seon
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.18 no.2
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    • pp.41-45
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    • 2010
  • It is often misled that Multi Pilot License is introduced by International Civil Aviation Organization for the shortage of pilots. The truth is, however, that the license is focused on efficient training of co-pilots in the airline transportation system which an autopilot system is increasing in the Multi Crew environment. ICAO has been researching on the license since 1982, and made it international standard on 2006. Currently, co-pilots trained under Multi-Crew Pilot License courses are continuously increasing over the world. Although the license has introduced to Korea in September 10, 2009, it has not won popular support yet. This paper will lead people to precise understanding of Multi-Crew Pilot License and suggest its introduction plan.

A Novel Least Square and Image Rotation based Method for Solving the Inclination Problem of License Plate in Its Camera Captured Image

  • Wu, ChangCheng;Zhang, Hao;Hua, JiaFeng;Hua, Sha;Zhang, YanYi;Lu, XiaoMing;Tang, YiChen
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.13 no.12
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    • pp.5990-6008
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    • 2019
  • Recognizing license plate from its traffic camera captured images is one of the most important aspects in many traffic management systems. Despite many sophisticated license plate recognition related algorithms available online, license plate recognition is still a hot research issue because license plates in each country all round the world lack of uniform format and their camera captured images are often affected by multiple adverse factors, such as low resolution, poor illumination effects, installation problem etc. A novel method is proposed in this paper to solve the inclination problem of license plates in their camera captured images through four parts: Firstly, special edge pixels of license plate are chosen to represent main information of license plates. Secondly, least square methods are used to compute the inclined angle of license plates. Then, coordinate rotation methods are used to rotate the license plate. At last, bilinear interpolation methods are used to improve the performance of license plate rotation. Several experimental results demonstrated that our proposed method can solve the inclination problem about license plate in visual aspect and can improve the recognition rate when used as the image preprocessing method.

A Car Plate Area Detection System Using Deep Convolution Neural Network (딥 컨볼루션 신경망을 이용한 자동차 번호판 영역 검출 시스템)

  • Jeong, Yunju;Ansari, Israfil;Shim, Jaechang;Lee, Jeonghwan
    • Journal of Korea Multimedia Society
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    • v.20 no.8
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    • pp.1166-1174
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    • 2017
  • In general, the detection of the vehicle license plate is a previous step of license plate recognition and has been actively studied for several decades. In this paper, we propose an algorithm to detect a license plate area of a moving vehicle from a video captured by a fixed camera installed on the road using the Convolution Neural Network (CNN) technology. First, license plate images and non-license plate images are applied to a previously learned CNN model (AlexNet) to extract and classify features. Then, after detecting the moving vehicle in the video, CNN detects the license plate area by comparing the features of the license plate region with the features of the license plate area. Experimental result shows relatively good performance in various environments such as incomplete lighting, noise due to rain, and low resolution. In addition, to protect personal information this proposed system can also be used independently to detect the license plate area and hide that area to secure the public's personal information.