DE4139515A1 - Optical detection and classification of precipitation - using light beam with vertical dimension smaller than largest particle to be detected - Google Patents
Optical detection and classification of precipitation - using light beam with vertical dimension smaller than largest particle to be detectedInfo
- Publication number
- DE4139515A1 DE4139515A1 DE4139515A DE4139515A DE4139515A1 DE 4139515 A1 DE4139515 A1 DE 4139515A1 DE 4139515 A DE4139515 A DE 4139515A DE 4139515 A DE4139515 A DE 4139515A DE 4139515 A1 DE4139515 A1 DE 4139515A1
- Authority
- DE
- Germany
- Prior art keywords
- light beam
- precipitation
- detected
- rain
- smaller
- 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- Withdrawn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
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/4802—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
Description
Es ist heutzutage üblich, daß Wetterdaten von automatischen sogenannten Wetterstationen für verschiedene Zentralen eingesam melt werden, um schnellen Zugang zu Wetterinformationen innerhalb eines relativ großen Gebietes zu erhalten. Beispielsweise ist daß Straßenamt damit beschäftigt, ein Netz solcher Automat stationen aufzubauen, um Beschlußunterlagen für das Straßennetz zu haben, wenn Einsätze beschlossen werden sollen, wie z. B. Sandsträuen oder Schneepflügen. Für die meisten Wettergrößen, wie Temperatur, Windstärke und Windrichtung, sind heute auto matische Geber zugängig. Wenn es aber um Niederschläge und Nebel geht, ist es schwierig preiswerte Lösungen zu finden.It is now common for weather data to be automatic so-called weather stations for various central gesam be melted to provide quick access to weather information within a relatively large area. For example that street bureau busy with a network of such automat to build decision-making documents for the road network to have assignments, such as: B. Sandsträuen or snowplows. For most weather parameters, like temperature, wind force and wind direction, today are auto accessible to all donors. But when it comes to rainfall and fog it is difficult to find cheap solutions.
Der Zweck der vorliegenden Erfindung ist ein unikes und billiges optisches Verfahren zum Detektieren und Klassifizieren von Niederschlägen der oben angegebenen Art vorzuschlagen. Diese Aufgabe wurde dadurch gelöst, daß die vertikale Ausstreckung des vom Lichtstrahl verbreiteten Lichtes kleiner ist als der Durch messer der größten Partikel die detektiert werden sollen oder zwischen 0,1 und 1 mm beträgt, wobei große Regentropfen von kleineren dadurch unterschieden werden indem sie kürzere Pulse verursachen, und Schnee von Regen unterschieden wird, indem Schneeflocken längere Pulse als Regentropfen verursachen, und daß die horizontale Ausstreckung des Lichtstrahles größer ist als dessen vertikale Ausstreckung.The purpose of the present invention is a unique and cheap one Optical method for detecting and classifying To propose precipitation of the type indicated above. These Problem was solved in that the vertical extension of the from the light beam diffused light is smaller than the through knife of the largest particles to be detected or between 0.1 and 1 mm, with large raindrops of smaller ones are distinguished by shorter pulses and snow is distinguished from rain by Snowflakes cause longer pulses than raindrops, and that the horizontal extension of the light beam is greater as its vertical extension.
Die vorliegende Erfindung nützt einen schmalen und ovalen Licht strahl aus, dessen vertikale Ausstreckung in der Größenordnung von 0,1 bis 1,0 mm ist, was mit Hilfe eines Halbleiterlasers realisiert werden kann. Wenn Partikel in der Luft angestrahlt werden, wird ein Licht nach hinten abgestreut, das von einem Detektor aufgefangen wird, der mit der Bestrahlungsquelle zusam mengebaut ist und welches rückwärts verbreitete Licht detektiert wird. Wenn die betreffende Partikeln Nebelpartikel sind, verur sacht dies ein Signal mit einer kontinuierlichen Komponente, was in einem DC-Signal vom Detektor resultiert. Wenn dagegen be ispielsweise Hagelkörner in den Strahl hineinfallen, erzeugt dieses einen Puls. Die Länge dieser Pulse hängt von der Fall geschwindigkeit der Partikel ab, sodaß ein schnell fallendes Partikel einen kürzeren Puls als ein langsam fallendes Partikel verursacht. Außerdem beeinflußt die Struktur des Partikels die Länge des Pulses, sodaß ein Wassertropfen einen kürzeren Puls als eine ebensoschnell fallende Schneeflocke verursacht. Dies hat seinen Grund darin, daß die periferen Teile der Schneeflocken licht nach Rückwärts verbreiten, während nur die zentralen Teile des Regentropfens dicht nach hinten verbreiten (reflektieren). Zur Sache gehört auch, daß kleine Regentropfen langsamer fallen als größe, was seinen Grund darin hat, daß das Verhältnis zwischen den antreibenden und bremsenden Kräften für große Regentropfen größer ist als für kleine.The present invention uses a narrow and oval light beam out, whose vertical extent is on the order of magnitude from 0.1 to 1.0 mm is what, with the help of a semiconductor laser can be realized. When particles are irradiated in the air a light is scattered backwards, that of one Detector is collected, which together with the irradiation source is built and which detected backward light becomes. If the particles are mist particles, verur this is a signal with a continuous component, what resulting in a DC signal from the detector. If on the other hand be For example, hailstones fall into the stream this one pulse. The length of these pulses depends on the case Speed of the particles, so that a rapidly falling Particles have a shorter pulse than a slowly falling particle caused. In addition, the structure of the particle affects the Length of the pulse, so that a drop of water has a shorter pulse as an equally fast falling snowflake. this has its reason is that the periferen parts of the snowflakes light to reverse, while only the central parts of raindrops spread close to the back (reflect). The thing is also that small raindrops fall more slowly as a greatness, which has its reason in the fact that the relationship between the driving and braking forces for big ones Raindrops are bigger than small ones.
Das somit beschriebene Phenomen bietet eine Möglichkeit an, nur mit Hilfe von gemessener Pulszeit, die Niederschläge zu klassifi zieren. Für einen Strahl mit einer Höhe von etwa 0,3 mm kann man folgende typische Resultate erwarten:The phenomenon thus described offers a possibility, only with the help of measured pulse time, the precipitation to classifi adorn. For a beam with a height of about 0.3 mm you can expect the following typical results:
Der Lichtstrahl wird mit ovalen Querschnitt ausgebildet, dessen kürzere Achse vertikal verläuft. Dadurch werden in gewisser Hin sicht die Fehler die durch Wind verursacht sind, vermieden. Wenn die Partikeln durch Einfluß eines Windes schräg durch die zentralen Teile des ovalen Strahles fallen, entspricht die Pulslänge der vertikalen Geschwindigkeit, was ja das ist, was man zu messen wünscht. The light beam is formed with an oval cross-section, whose shorter axis is vertical. This will in some way The errors caused by wind are avoided. If the particles through the influence of a wind obliquely through the central parts of the oval ray fall, corresponds to the Pulse length of vertical speed, which is what you are wants to measure.
Ein wichtiges Kennzeichen der vorliegende Erfindung ist somit, daß das nach hinten verbreitete Licht registriert wird, wenn ein Niederschlagspartikel einen Lichtstrahl passiert, dessen vertika le Ausstreckung kleiner oder vergleichbar mit dem Durchmesser der Partikeln ist, die registriert und klassifiziert werden sollen. Nichts hindert jedoch daran, daß man die Strahlung detektiert, die in anderen Richtungen als rückwärts verbreitet werden. Der Grund weshalb in der vorliegenden Erfindung die Zerstreung nach hinten ausgenützt wird ist, daß dadurch die Konstruktion sehr einfach und widerstandsfähig ist, und außerdem den geringsten denkbaren Einfluß auf die Luftströmungen um den Geber herum mitführt, wobei die Luftströmung beim Messen eine Fehlerquelle ausmacht.An important feature of the present invention is therefore that the light spread to the rear is registered when a Precipitation particle passes a beam of light whose vertika le extension smaller or comparable to the diameter of the particles that are registered and classified should. Nothing prevents the radiation detected spreading in other directions than backwards become. The reason why in the present invention the Disruption is exploited to the rear is that thereby the Construction is very simple and durable, and besides the least conceivable influence on the air flows around the Encoder carries around, wherein the air flow when measuring a Error source.
Es existieren sogenannte "present weather instruments", die mit optischen Verfahren, zusammen mit einem kraftvollen Computer Niederschlag detektieren und klassifizieren. Diese Instrumente unterscheiden sich von der vorliegende Erfindung durch zwei wichtige Punkte. Erstens arbeiten sie mit einem Lichtstrahl, dessen Querschnittsfläche bedeutend größer ist als die Nie derschlagspartikel, was für die Funktion eine Bedingung ist. Diese Instrumente bearbeiten nämlich die Querschnittsfläche via die Amplitude der registrierten Signale. Zum zweiten wird das Licht detektiert, welches die Niederschlagspartikel nicht verb reite (Transmissionsprinzip) oder das Licht welches die Partikel in einem Winkel verbreiten, der annähernd in Richtung des Licht strahles liegen (Verbreitung in Richtung vorwärts).There are so-called "present weather instruments" with the optical process, together with a powerful computer Detect and classify precipitation. These instruments differ from the present invention by two important points. First, they work with a beam of light, whose cross-sectional area is significantly larger than the Never impact particle, which is a condition for the function. These instruments process the cross-sectional area via the amplitude of the registered signals. The second is the Light detected, which does not verb the precipitation particles ride (transmission principle) or the light which the particles spread at an angle that is approaching towards the light jet (spread in the direction forward).
Es ist möglich auf Basis der Pulszeit jedes Tropfens dessen Volumen zu berechnen, was auch eine Berechnung des Niederschlages in Millimetern ermöglicht.It is possible based on the pulse time of each drop of it Calculate volume, which is also a calculation of precipitation in millimeters.
Die Erfindung ist nicht auf das oben beschriebene Beispiel begrenzt sondern kann im Rahmen der Ansprüche variiert werden. Somit kann ein AM-modulierter Halbleiterlaser nebst Fokuzie rungsobjektiv neben einem Detektor mit dazugehörender Sammellinse gemäß beigefügter Abbildung montiert werden. Wenn der Laser strahl die optische Achse der Detektorlinse in einem Winkel schneidet, der größer als halbe Öffnungswinkel des Detektie rungsbereiches ist, gemäß Abbildung, wird der Detektor verbrei tetes Licht von eventuellen Partikel innerhalb eines begrenzen Gebietes empfangen, daß von einem Schnitt zwischen dem Detektie rungsbereich und dem Laserstrahl definiert wird. Nach der Syn kronmodulierung des Detektorsignales werden Pulse erhalten, wenn Partikeln durch daß eben definierte Gebiet passieren. Die Elektronik enthält Kreise zur Bestimmung der Pulslängen.The invention is not based on the example described above limited but can be varied within the scope of the claims. Thus, an AM-modulated semiconductor laser and Fokuzie tion lens next to a detector with associated condenser lens mounted as shown in the picture. If the laser Beam the optical axis of the detector lens at an angle which is greater than half the detection angle of the detector as shown, the detector will spread limited light from any particles within a limit Area received that from a cut between the Detektie range and the laser beam is defined. After the Syn Crown modulation of the detector signal will receive pulses when Particles pass through just defined area. The Electronics contains circuits for determining the pulse lengths.
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9003817A SE467553B (en) | 1990-11-30 | 1990-11-30 | OPTICAL METHOD TO DETECT AND CLASSIFY RETURNS BY DETECTING SPRITT RESP BACKGROUND LIGHT FROM A BRIGHT |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4139515A1 true DE4139515A1 (en) | 1992-06-04 |
Family
ID=20381058
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4139515A Withdrawn DE4139515A1 (en) | 1990-11-30 | 1991-11-29 | Optical detection and classification of precipitation - using light beam with vertical dimension smaller than largest particle to be detected |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE4139515A1 (en) |
SE (1) | SE467553B (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0698261A1 (en) * | 1993-05-07 | 1996-02-28 | Dennis J. Hegyi | Multi-fonction light sensor for vehicle |
WO1997040407A1 (en) * | 1996-04-18 | 1997-10-30 | Krupp Fördertechnik Gmbh | Photogrammetric process for three-dimensional tracking of moving objects |
US6084519A (en) * | 1993-05-07 | 2000-07-04 | Control Devices, Inc. | Multi-function light sensor for vehicle |
US6118383A (en) * | 1993-05-07 | 2000-09-12 | Hegyi; Dennis J. | Multi-function light sensor for vehicle |
US6313454B1 (en) | 1999-07-02 | 2001-11-06 | Donnelly Corporation | Rain sensor |
US6320176B1 (en) | 1993-02-26 | 2001-11-20 | Donnelly Corporation | Vehicle rain sensor using imaging sensor |
US6353392B1 (en) | 1997-10-30 | 2002-03-05 | Donnelly Corporation | Rain sensor with fog discrimination |
WO2004021546A2 (en) * | 2002-08-09 | 2004-03-11 | Conti Temic Microelectronic Gmbh | Means of transport with a three-dimensional distance camera and method for the operation thereof |
US7655894B2 (en) | 1996-03-25 | 2010-02-02 | Donnelly Corporation | Vehicular image sensing system |
US7859565B2 (en) | 1993-02-26 | 2010-12-28 | Donnelly Corporation | Vision system for a vehicle including image processor |
US7972045B2 (en) | 2006-08-11 | 2011-07-05 | Donnelly Corporation | Automatic headlamp control system |
US8017898B2 (en) | 2007-08-17 | 2011-09-13 | Magna Electronics Inc. | Vehicular imaging system in an automatic headlamp control system |
US8063759B2 (en) | 1993-02-26 | 2011-11-22 | Donnelly Corporation | Vehicle vision system |
US8446470B2 (en) | 2007-10-04 | 2013-05-21 | Magna Electronics, Inc. | Combined RGB and IR imaging sensor |
US8451107B2 (en) | 2007-09-11 | 2013-05-28 | Magna Electronics, Inc. | Imaging system for vehicle |
US9509957B2 (en) | 2008-07-24 | 2016-11-29 | Magna Electronics Inc. | Vehicle imaging system |
US9940528B2 (en) | 2004-12-23 | 2018-04-10 | Magna Electronics Inc. | Driver assistance system for vehicle |
-
1990
- 1990-11-30 SE SE9003817A patent/SE467553B/en not_active IP Right Cessation
-
1991
- 1991-11-29 DE DE4139515A patent/DE4139515A1/en not_active Withdrawn
Cited By (48)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6320176B1 (en) | 1993-02-26 | 2001-11-20 | Donnelly Corporation | Vehicle rain sensor using imaging sensor |
US8063759B2 (en) | 1993-02-26 | 2011-11-22 | Donnelly Corporation | Vehicle vision system |
US7859565B2 (en) | 1993-02-26 | 2010-12-28 | Donnelly Corporation | Vision system for a vehicle including image processor |
US6831261B2 (en) | 1993-02-26 | 2004-12-14 | Donnelly Corporation | Vehicle headlight control using imaging sensor |
US6559435B2 (en) | 1993-02-26 | 2003-05-06 | Donnelly Corporation | Vehicle headlight control using imaging sensor identifying objects by geometric configuration |
EP0698261A1 (en) * | 1993-05-07 | 1996-02-28 | Dennis J. Hegyi | Multi-fonction light sensor for vehicle |
US6118383A (en) * | 1993-05-07 | 2000-09-12 | Hegyi; Dennis J. | Multi-function light sensor for vehicle |
US6084519A (en) * | 1993-05-07 | 2000-07-04 | Control Devices, Inc. | Multi-function light sensor for vehicle |
US5703568A (en) * | 1993-05-07 | 1997-12-30 | Hegyi; Dennis J. | Multi function light sensor for vehicle |
EP0698261A4 (en) * | 1993-05-07 | 1996-07-03 | Dennis J Hegyi | Multi-fonction light sensor for vehicle |
US8492698B2 (en) | 1996-03-25 | 2013-07-23 | Donnelly Corporation | Driver assistance system for a vehicle |
US8481910B2 (en) | 1996-03-25 | 2013-07-09 | Donnelly Corporation | Vehicular image sensing system |
US8324552B2 (en) | 1996-03-25 | 2012-12-04 | Donnelly Corporation | Vehicular image sensing system |
US8222588B2 (en) | 1996-03-25 | 2012-07-17 | Donnelly Corporation | Vehicular image sensing system |
US7994462B2 (en) | 1996-03-25 | 2011-08-09 | Donnelly Corporation | Vehicular image sensing system |
US7655894B2 (en) | 1996-03-25 | 2010-02-02 | Donnelly Corporation | Vehicular image sensing system |
WO1997040407A1 (en) * | 1996-04-18 | 1997-10-30 | Krupp Fördertechnik Gmbh | Photogrammetric process for three-dimensional tracking of moving objects |
US6806452B2 (en) | 1997-09-22 | 2004-10-19 | Donnelly Corporation | Interior rearview mirror system including a forward facing video device |
US6768422B2 (en) | 1997-10-30 | 2004-07-27 | Donnelly Corporation | Precipitation sensor |
US6353392B1 (en) | 1997-10-30 | 2002-03-05 | Donnelly Corporation | Rain sensor with fog discrimination |
US6313454B1 (en) | 1999-07-02 | 2001-11-06 | Donnelly Corporation | Rain sensor |
US8629768B2 (en) | 1999-08-12 | 2014-01-14 | Donnelly Corporation | Vehicle vision system |
US8203443B2 (en) | 1999-08-12 | 2012-06-19 | Donnelly Corporation | Vehicle vision system |
WO2004021546A2 (en) * | 2002-08-09 | 2004-03-11 | Conti Temic Microelectronic Gmbh | Means of transport with a three-dimensional distance camera and method for the operation thereof |
WO2004021546A3 (en) * | 2002-08-09 | 2004-06-03 | Conti Temic Microelectronic | Means of transport with a three-dimensional distance camera and method for the operation thereof |
US9940528B2 (en) | 2004-12-23 | 2018-04-10 | Magna Electronics Inc. | Driver assistance system for vehicle |
US11308720B2 (en) | 2004-12-23 | 2022-04-19 | Magna Electronics Inc. | Vehicular imaging system |
US10509972B2 (en) | 2004-12-23 | 2019-12-17 | Magna Electronics Inc. | Vehicular vision system |
US8434919B2 (en) | 2006-08-11 | 2013-05-07 | Donnelly Corporation | Adaptive forward lighting system for vehicle |
US8162518B2 (en) | 2006-08-11 | 2012-04-24 | Donnelly Corporation | Adaptive forward lighting system for vehicle |
US7972045B2 (en) | 2006-08-11 | 2011-07-05 | Donnelly Corporation | Automatic headlamp control system |
US9018577B2 (en) | 2007-08-17 | 2015-04-28 | Magna Electronics Inc. | Vehicular imaging system with camera misalignment correction and capturing image data at different resolution levels dependent on distance to object in field of view |
US11908166B2 (en) | 2007-08-17 | 2024-02-20 | Magna Electronics Inc. | Vehicular imaging system with misalignment correction of camera |
US9972100B2 (en) | 2007-08-17 | 2018-05-15 | Magna Electronics Inc. | Vehicular imaging system comprising an imaging device with a single image sensor and image processor for determining a totally blocked state or partially blocked state of the single image sensor as well as an automatic correction for misalignment of the imaging device |
US11328447B2 (en) | 2007-08-17 | 2022-05-10 | Magna Electronics Inc. | Method of blockage determination and misalignment correction for vehicular vision system |
US8017898B2 (en) | 2007-08-17 | 2011-09-13 | Magna Electronics Inc. | Vehicular imaging system in an automatic headlamp control system |
US10726578B2 (en) | 2007-08-17 | 2020-07-28 | Magna Electronics Inc. | Vehicular imaging system with blockage determination and misalignment correction |
US10766417B2 (en) | 2007-09-11 | 2020-09-08 | Magna Electronics Inc. | Imaging system for vehicle |
US11613209B2 (en) | 2007-09-11 | 2023-03-28 | Magna Electronics Inc. | System and method for guiding reversing of a vehicle toward a trailer hitch |
US9796332B2 (en) | 2007-09-11 | 2017-10-24 | Magna Electronics Inc. | Imaging system for vehicle |
US8451107B2 (en) | 2007-09-11 | 2013-05-28 | Magna Electronics, Inc. | Imaging system for vehicle |
US8446470B2 (en) | 2007-10-04 | 2013-05-21 | Magna Electronics, Inc. | Combined RGB and IR imaging sensor |
US11165975B2 (en) | 2007-10-04 | 2021-11-02 | Magna Electronics Inc. | Imaging system for vehicle |
US10616507B2 (en) | 2007-10-04 | 2020-04-07 | Magna Electronics Inc. | Imaging system for vehicle |
US10003755B2 (en) | 2007-10-04 | 2018-06-19 | Magna Electronics Inc. | Imaging system for vehicle |
US8908040B2 (en) | 2007-10-04 | 2014-12-09 | Magna Electronics Inc. | Imaging system for vehicle |
US11091105B2 (en) | 2008-07-24 | 2021-08-17 | Magna Electronics Inc. | Vehicle vision system |
US9509957B2 (en) | 2008-07-24 | 2016-11-29 | Magna Electronics Inc. | Vehicle imaging system |
Also Published As
Publication number | Publication date |
---|---|
SE9003817L (en) | 1992-05-31 |
SE467553B (en) | 1992-08-03 |
SE9003817D0 (en) | 1990-11-30 |
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