[특허]Apparatus and method for reading a license plate

Apparatus and method for reading a license plate 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06K-009/00
출원번호	US-0277682 (1988-11-29)
발명자 / 주소	Jones III Creed F. (Oliver Springs TN) Goldston Michael A. (Knoxville TN) Patek David R. (Knoxville TN)
출원인 / 주소	Westinghouse Electric Corp. (Pittsburgh PA 02)
인용정보	피인용 횟수 : 74 인용 특허 : 0

초록 ▼

A license plate reader and method for reading the characters of a license plate and for identifying the state which issued the plate utilizes image intensity transition information gathered while scanning the plate. With the gathered intensity transition information, the plate image is identified and the license plate characters are extracted from the plate background with a relatively high degree of accuracy. A chopper isolates the region of the plate containing the character set for character-reading purposes and compensates for rivets in the plate and character appendages. A contour tracer is adapted to trace the exterior edges of each license plate character, and a tilt compensator compensates for the tilted condition of the characters when the plate is tilted relative to the horizontal. Furthermore, intensity transition patterns relating to decorative and non-decorative characteristics of the plate aid in the identification of the state which issued the plate, and an adjuster conforms, when necessary, the identity of an identified character so that the alphanumeric pattern conforms to an acceptable alphanumeric pattern of a plate of the identified plate-issuing state.

대표청구항 ▼

In an apparatus for finding and identifying the characters of a license plate having a set of characters including means for producing an image that includes the license plate, and means for recognizing and identifying the characters of the license plate, the improvement comprising: plate finding means associated with said recognizing and identifying means including: a) a database containing criteria relating to the expected height of license plate characters contained within the produced image; b) means for scanning one-line-at-a-time for a predetermined distance across a portion of the license plate character set from a location situated between the top and bottom boundaries of the character set and moving one-line-at-a-time across said character set portion toward the top boundary thereof and moving one-line-at-a-time across said character set portion toward the bottom boundary thereof so that the license plate character set is scanned generally upwardly and downwardly along one vertically-oriented column having a width which is equal to said predetermined distance, each of said scanned lines having an associated average gray level intensity and a gray level variance; c) means for measuring the average gray level intensity and the gray level variance along the scanned lines; d) means for sensing at a location adjacent the top boundary of the character set a significant decrease in the gray level variance and the average gray level intensity between one scanned line and another scanned line as said one and another lines are scanned in sequence and identifying said one scanned line as the tip edge of the character set; e) means for sensing at a location adjacent the bottom boundary of the character set a significant decrease in the average gray level intensity and gray level variance between two successively-scanned lines and identifying the first of said two successively-scanned lines as the bottom edge of the character set; and f) means for measuring the distance between the identified tip and bottom edges of the character set portion and for comparing the measured distance to height criteria contained within said database to determine whether the measured distance corresponds to an expected height of the character set.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
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연합인증

Apparatus and method for reading a license plate 원문보기

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Apparatus and method for reading a license plate 원문보기

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연구과제 타임라인

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