A STUDY ON A GENERIC CHARACTER EXTRACTION METHOD FOR VEHICLE LICENSE PLATES USING PROJECTIVE TRANSFORMATION
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- IMAI Ryuichi
- 法政大学 デザイン工学部
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- YAMAMOTO Yuhei
- 関西大学 環境都市工学部
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- NAKAHARA Masaya
- 大阪電気通信大学 総合情報学部
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- KAMIYA Daisuke
- 琉球大学 工学部
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- JIANG Wenyuan
- 大阪産業大学 工学部
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- NAKAHATA Koki
- NRIデジタル株式会社
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- SUMIYOSHI Ryo
- 法政大学大学院 デザイン工学研究科
Bibliographic Information
- Other Title
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- 射影変換を用いた車両ナンバープレートの汎用的な文字抽出手法に関する研究
Abstract
<p> In Japan, AI is being incorporated into automobile traffic volume surveys to enhance efficiency. By recognizing license plates in these surveys, it's possible to measure vehicle flow, refining the accuracy of the survey. However, when the video footage is taken from a high vantage point on the road's shoulder, the license plates appear tilted. To correct this, the image needs to be adjusted to a frontal orientation. If the license plate and the vehicle have the same color, determining a reference point for the projective transformation becomes challenging. To address this issue, we developed a method that corrects the license plate to a front-facing orientation using a projective transformation, based on the position of the fourth digit of the serial number—a consistent feature on all license plates. Our experimental results indicated successful character extraction from 479 out of 500 images. We aim to apply this technique in future traffic flow studies to identify the same vehicle at multiple locations.</p>
Journal
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- Japanese Journal of JSCE
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Japanese Journal of JSCE 80 (22), n/a-, 2024
Japan Society of Civil Engineers
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Keywords
Details 詳細情報について
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- CRID
- 1390581148791640320
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- ISSN
- 24366021
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
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- Abstract License Flag
- Disallowed