CCTV CCTV System and Method for improving Recognition of Car Number by Using dynamic Thresholds

Disclosed are a CCTV system and a vehicle number recognition method thereof. According to the present invention, the CCTV system can recognize a vehicle number by binarizing a brightness value of pixels belonging to a vehicle number area of a vehicle image to extract the number belonging to the fore...

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Hauptverfasser: KIM KYUNG LOK, LEE BUB KI
Format: Patent
Sprache:eng ; kor
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Zusammenfassung:Disclosed are a CCTV system and a vehicle number recognition method thereof. According to the present invention, the CCTV system can recognize a vehicle number by binarizing a brightness value of pixels belonging to a vehicle number area of a vehicle image to extract the number belonging to the foreground from the background. At this time, a threshold value which is a reference of a vehicle number binarization is based on a brightness value distribution chart of the pixels obtained by dividing each row of the pixels, so as to minimize the influence of a shade, even if a vehicle license plate is shaded, and to increase a recognition rate of the vehicle number. CCTV 시스템 및 그 차량번호 인식방법이 개시된다. 본 발명에 따른 CCTV 시스템은 차량 이미지의 차량번호 영역에 속하는 픽셀의 밝기 값을 이진화함으로써 배경으로부터 전경에 속하는 번호를 추출하는 방식으로 차량 번호를 인식할 수 있다. 이때, 차량 번호 이진화의 기준이 되는 문턱값을 픽셀 행별로 구한 픽셀의 밝기값 분포도를 기준으로 하기 때문에 차량번호판에 음영이 생기더라도 음영에 의한 영향을 최소화할 수 있으며, 그만큼 차량번호 인식율을 높인다.