DE4401738A1 - Line scan camera system for road vehicle identification - Google Patents
Line scan camera system for road vehicle identificationInfo
- Publication number
- DE4401738A1 DE4401738A1 DE4401738A DE4401738A DE4401738A1 DE 4401738 A1 DE4401738 A1 DE 4401738A1 DE 4401738 A DE4401738 A DE 4401738A DE 4401738 A DE4401738 A DE 4401738A DE 4401738 A1 DE4401738 A1 DE 4401738A1
- Authority
- DE
- Germany
- Prior art keywords
- early detection
- information
- vehicle
- memory
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10712—Fixed beam scanning
- G06K7/10722—Photodetector array or CCD scanning
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/60—Type of objects
- G06V20/62—Text, e.g. of license plates, overlay texts or captions on TV images
- G06V20/63—Scene text, e.g. street names
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/60—Type of objects
- G06V20/62—Text, e.g. of license plates, overlay texts or captions on TV images
- G06V20/625—License plates
Abstract
Description
Bekannt sind elektronische Bildverarbeitungssysteme bestehend aus Videokamera entsprechend einer Fernsehnorm (CCIR, RS-170), Bildwandler mit digitalem Speicher (Frame Grabber) und Rechner. Diese Einrichtung kann und wird auch zur Erkennung von Fahrzeugen anhand ihrer polizeilichen Kennzeichen (Nummernschilder) benutzt. Bei langsamen Bewegungen z. B. Parkhaussituation und Wiegevorgängen in Verbindung mit Be- und Endladung sind die Erfassungsbereiche für das Kennzeichen (KZ) eingeengt und die Zeitverhältnisse für die Kennzeichenerkennung unkritisch.Electronic image processing systems consisting of are known Video camera according to a television standard (CCIR, RS-170), Image converter with digital memory (frame grabber) and computer. This device can and will also be used to detect vehicles used on the basis of their police license plates (number plates). With slow movements z. B. Parking situation and Weighing processes in connection with loading and unloading are the Detection areas for the license plate (KZ) narrowed and the Time ratios for license plate recognition are not critical.
Soll ein derartiges System zur Erfassung von KZ im fließenden Verkehr eingesetzt werden (z. B. durch die Positionierung der Kamera derart, daß der abfließende Verkehr betrachtet wird) dann wird aufgrund der festgelegten Bildformate solcher "Matrix"kameras einerseits und der Geometrie von Fahrbahnbreite und Kennzeichen größe andererseits das zu erkennende Kennzeichen einen sehr geringen Anteil des Bildes im Bildspeicher einnehmen (<1%).Should such a system for the detection of concentration camps in the flowing Traffic can be used (e.g. by positioning the Camera in such a way that the outgoing traffic is observed) then is based on the specified image formats of such "matrix" cameras on the one hand and the geometry of the lane width and number plate size, on the other hand, the license plate to be recognized a very take up a small proportion of the image in the image memory (<1%).
Die im fließenden Verkehr auftretenden sehr kurzen Verarbeitungszeiten (entsprechend einem Mindestabstand bei Maximalgeschwindigkeit zweier aufeinander folgender Fahrzeuge) erfordern schnelle Rechner (z. B. Parallelarchitekturen), um das Kennzeichen innerhalb des Bildes zunächst einmal zu finden.The very short ones that occur in flowing traffic Processing times (corresponding to a minimum distance at Maximum speed of two consecutive vehicles) require fast computers (e.g. parallel architectures) to do this First of all to find the license plate within the picture.
Wegen der Eigenbewegung der Fahrzeuge kann anstelle des Matrixsensors (CCD) ein Zeilensensor eingesetzt werden. Dieser ermöglicht ein Vielfaches der horizontalen Auflösung (Anzahl der Pixel im Verhältnis 2 bis 10). Dadurch kann entweder ein breiterer Raum überwacht werden und/oder das Kennzeichen mit größerer Auflösung dargestellt werden.Because of the vehicle's own movement, instead of Matrix sensor (CCD) a line sensor can be used. This enables a multiple of the horizontal resolution (number of Pixels in the ratio 2 to 10). This can either make a wider one Space to be monitored and / or the license plate with larger Resolution can be displayed.
Zur bildlichen Darstellung muß durch Takten des Zeilensensors die analoge Videoinformation nach einer Digitalisierung in einem Bildspeicher zeilenweise zusammengesetzt werden. Die Breite des KZ im Bildspeicher wird durch die Optik und die Geometrie des Zeilensensors (Abmessungen und Pixelanzahl) festgelegt. Die Höhe des Kennzeichens (Schrifthöhe) wird in der Abbildung im Bildspeicher reziprok zur Geschwindigkeit des Fahrzeugs dargestellt. Wird bei einer maximalen Geschwindigkeit das Kennzeichen im Bildspeicher unverzerrt dargestellt, dann kann eine Korrektur der Höhe bei niedrigeren Geschwindigkeiten "vor der Abspeicherung" durch dynamisches Anpassen der Zeilenwiederhohlfrequenz bzw. durch Auslassen von Zeilen entsprechend einer Geschwindigkeitsinformation erfolgen. "Nach der Abspeicherung" ist eine Korrektur der Schrifthöhe (Skalierung) durch das Programm im Rahmen der Schrifterkennung möglich. For visual representation, the analog video information after digitization in one Image memory can be put together line by line. The width of the concentration camp in the image memory is due to the optics and the geometry of the Line sensor (dimensions and number of pixels) set. The height of the label (font height) is shown in the illustration in Image memory reciprocal to the speed of the vehicle shown. Will at maximum speed License plate displayed in the image memory undistorted, then one Correction of altitude at lower speeds "before Storage "by dynamically adapting the Line repetition frequency or by omitting lines according to a speed information. "After Saving "is a correction of the font height (scaling) possible through the program as part of the font recognition.
Zur weiteren entscheidenden Verbesserung gehört die Früherkennung des KZ (z. B. anhand seines charakteristischen Videospektrums). Dies ermöglicht in Echtzeit die Ausfilterung und Abspeicherung des Kennzeichenanteils aus der Zeileninformation. Bei einem derart formatfüllend abgespeicherten Kennzeichens im Bildspeicher entfällt damit gegenüber der Lösung mit Matrixsensor die Suchzeit.Early detection is another key improvement of the concentration camp (e.g. based on its characteristic video spectrum). This enables the filtering and storage of the Number of license plates from the line information. With such a License plate stored in full format in the image memory Compared to the solution with a matrix sensor, the search time is no longer required.
Deutlichere Abbildung und längere Verarbeitungszeit ermöglichen den Einsatz einfacherer Rechner (z. B. auf der Basis eines PC), die dann innerhalb des Kameragehäuses die Schrifterkennung vornehmen und die Zeichen des Kennzeichens im ASCII-Code und andere Informationen zur weiteren Verarbeitung ausgeben.Enable clearer imaging and longer processing times the use of simpler computers (e.g. based on a PC), the then carry out the character recognition within the camera housing and the characters of the license plate in ASCII code and others Output information for further processing.
Claims (18)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4401738A DE4401738A1 (en) | 1994-01-21 | 1994-01-21 | Line scan camera system for road vehicle identification |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4401738A DE4401738A1 (en) | 1994-01-21 | 1994-01-21 | Line scan camera system for road vehicle identification |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4401738A1 true DE4401738A1 (en) | 1995-07-27 |
Family
ID=6508408
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4401738A Withdrawn DE4401738A1 (en) | 1994-01-21 | 1994-01-21 | Line scan camera system for road vehicle identification |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4401738A1 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU840974A1 (en) * | 1979-09-18 | 1981-06-23 | Всесоюзный Научно-Исследовательскийинститут Электрификации Сельскогохозяйства Всесоюзной Ордена Ленинаакадемии Сельскохозяйственных Науким. B.И.Ленина | Device for reading-out ad registering numbers of objects |
DE3203897A1 (en) * | 1981-11-07 | 1983-05-19 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Device for detecting and processing characters and/or predetermined optical details |
DE3235307A1 (en) * | 1981-11-07 | 1984-03-29 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Method and device for detecting and processing characters and/or predetermined optical details |
US4567609A (en) * | 1983-03-28 | 1986-01-28 | The United States Of America As Represented By The Secretary Of The Navy | Automatic character recognition system |
US4878248A (en) * | 1988-04-18 | 1989-10-31 | Industrial Technology Research Institute | Method and apparatus for automatically recognizing license plate characters |
SU1727142A1 (en) * | 1990-05-17 | 1992-04-15 | Научно-исследовательский институт промышленного телевидения "Растр" | Signal extraction device for analysis of moving objects |
SU1736002A2 (en) * | 1990-01-25 | 1992-05-23 | Предприятие П/Я В-8751 | Digital filter |
-
1994
- 1994-01-21 DE DE4401738A patent/DE4401738A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU840974A1 (en) * | 1979-09-18 | 1981-06-23 | Всесоюзный Научно-Исследовательскийинститут Электрификации Сельскогохозяйства Всесоюзной Ордена Ленинаакадемии Сельскохозяйственных Науким. B.И.Ленина | Device for reading-out ad registering numbers of objects |
DE3203897A1 (en) * | 1981-11-07 | 1983-05-19 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Device for detecting and processing characters and/or predetermined optical details |
DE3235307A1 (en) * | 1981-11-07 | 1984-03-29 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Method and device for detecting and processing characters and/or predetermined optical details |
US4567609A (en) * | 1983-03-28 | 1986-01-28 | The United States Of America As Represented By The Secretary Of The Navy | Automatic character recognition system |
US4878248A (en) * | 1988-04-18 | 1989-10-31 | Industrial Technology Research Institute | Method and apparatus for automatically recognizing license plate characters |
SU1736002A2 (en) * | 1990-01-25 | 1992-05-23 | Предприятие П/Я В-8751 | Digital filter |
SU1727142A1 (en) * | 1990-05-17 | 1992-04-15 | Научно-исследовательский институт промышленного телевидения "Растр" | Signal extraction device for analysis of moving objects |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8139 | Disposal/non-payment of the annual fee |