WO2013026628A1 - Procédé de production d'un signal lumineux de détection de pluie dans un véhicule et procédé de détection de pluie dans un véhicule - Google Patents

Procédé de production d'un signal lumineux de détection de pluie dans un véhicule et procédé de détection de pluie dans un véhicule Download PDF

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Publication number
WO2013026628A1
WO2013026628A1 PCT/EP2012/064002 EP2012064002W WO2013026628A1 WO 2013026628 A1 WO2013026628 A1 WO 2013026628A1 EP 2012064002 W EP2012064002 W EP 2012064002W WO 2013026628 A1 WO2013026628 A1 WO 2013026628A1
Authority
WO
WIPO (PCT)
Prior art keywords
light signal
light
passband
nanometers
vehicle
Prior art date
Application number
PCT/EP2012/064002
Other languages
German (de)
English (en)
Inventor
Petko Faber
Martin Rous
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2013026628A1 publication Critical patent/WO2013026628A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
    • B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
    • B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
    • B60S1/0833—Optical rain sensor

Definitions

  • the present invention relates to a method for processing a light signal for rain detection in a vehicle, to a method for rain detection in a vehicle, to a device which is designed to perform the steps of one of these methods, and to a computer program product with program code for Perform any of these procedures when running the program on a device.
  • An image-based rain sensor uses, for example, at night an active light source for illuminating a windshield of a vehicle, wherein the light source emits light in a spectral range, not visible to humans, usually in the infrared spectral range.
  • a notch filter which limits the detectable spectrum from a certain variable cutoff frequency and thus minimizes the possibly disturbing influence of infrared light.
  • the reason for this is the relatively high level of infrared radiation in halogen headlamps commonly used as vehicle headlamps, which makes it possible to differentiate between different light sources, e.g. Headlights and taillights is difficult.
  • the detection of light in the region of the light source of the rain sensor is then not possible.
  • DE 10 2007 034 606 A1 discloses a system for detecting optical signals with a rain sensor and method. Disclosure of the invention
  • the present invention provides a method for processing a light signal for rain detection in a vehicle
  • the present invention provides a method of conditioning a light signal for rain detection in a vehicle, the method as follows
  • the vehicle may be a motor vehicle, in particular a road-bound motor vehicle, for example a passenger car, lorry, a vehicle for passenger transport or another commercial vehicle.
  • the light signal can also simply be called light.
  • the light signal comprises electromagnetic waves in a range of wavelengths or light wavelengths from the electromagnetic spectrum.
  • the light signal comprises electromagnetic waves in the spectrum visible to the human eye and electromagnetic waves outside the spectrum visible to the human eye, such as electromagnetic waves in the infrared spectrum, in particular the near infrared. In the visible to the human eye spectrum, the electromagnetic
  • Waves of the light signal have a wavelength of about 380 to 780 nanometers on. In the near infrared, the electromagnetic waves of the light signal have a wavelength of about 780 to 1400 nanometers. In the blocking area, electromagnetic waves are filtered out of the light signal or blocked or attenuated.
  • the stopband may include the spectrum visible to the human eye and / or wavelengths associated with the infrared spectrum. In the pass bands, electromagnetic waves in the light signal are at least partially transmitted or not filtered out.
  • the first passband may include wavelengths associated with the spectrum visible to the human eye.
  • the second passband may include wavelengths associated with the infrared spectrum. The second passband is configured to pass electromagnetic waves of suitable wavelengths used for rain detection in the vehicle. Rain detection can detect precipitation or moisture in general.
  • the present invention further provides a method for rain detection in a vehicle, the method comprising the steps of:
  • the step of recognizing can be carried out, for example, by means of an optical detection device.
  • the optical detection device may be arranged in the vehicle.
  • the optical detection device can be image processing electronics or image processing devices that are designed to process image data generated based on the light signal in order to detect rain.
  • the optical detection device can be coupled to a camera device or via a
  • the optical detection device can also be, for example, a vehicle camera in the form of a video camera or still camera, to which image processing electronics can be assigned.
  • the optical detection device can then be directed, for example, to a windshield and an environment of the vehicle.
  • CMOS Complementary Metal Oxide Semiconductor (dt complementary metal-oxide semiconductor) and the an infrared cut filter or IR cut filter or so-called IR CutOff filter, for example, is upstream.
  • the present invention further provides an apparatus configured to perform the steps of any of the above methods.
  • the apparatus may comprise means adapted to carry out the steps of one of the above-mentioned methods.
  • the present invention provides an apparatus for conditioning a light signal for rain detection in a vehicle, the apparatus comprising: a filter for filtering the light signal to produce a light wavelength cutoff range and two light wavelength cutoff ranges, the cutoff range being between one first passband arranged in the spectrum visible to the human eye and a second passband arranged in the infrared spectrum, wherein values of the light signal from the second passband are used for rain detection.
  • the filter may, for example, be an optical filter.
  • the filter may also be electronically controlled, for example. Also by this embodiment of the invention in the form of a device, the object underlying the invention can be solved quickly and efficiently.
  • a device can be understood to mean an electrical device or control device which processes sensor signals and outputs control signals in dependence thereon.
  • the device may have an interface, which may be formed in hardware and / or software.
  • the interfaces can be part of a so-called system ASIC, for example, which contains a wide variety of functions of the device.
  • the interfaces are their own integrated circuits or at least partially consist of discrete components.
  • the interfaces may be software modules, for example, which are present on a microcontroller in addition to other software modules.
  • Also of advantage is a computer program product with program code stored on a machine-readable medium such as a semiconductor memory, a hard disk memory or an optical memory and used for performing any of the methods of any of the above-described embodiments when the program is executed on a device.
  • a machine-readable medium such as a semiconductor memory, a hard disk memory or an optical memory
  • the invention is based on the finding that, for rain detection or rain detection using infrared radiation, a light signal is processed in such a way that a transmission range or bandpass is generated in the infrared range of the electromagnetic spectrum only in a suitably defined, limited range of wavelengths , Using the electromagnetic radiation from the limited range of wavelengths, the rain detection is then performed.
  • One advantage of the present invention is that rain detection using the processed light signal can reliably take place, whereby a function of further light-based vehicle systems experiences a reduced impairment due to rain detection due to the conditioned light signal.
  • an infrared barrier or an IR cutoff of a camera unit can be largely retained, whereby negative effects on the performance of, for example, driver assistance functions, measuring programs and the like can be avoided.
  • This is possible since only the spectral range, which is assigned to an infrared LED likewise used for rain detection in the vehicle, for example, is opened in the infrared cut filter or I R cutoff filter, for example by a so-called bandpass filter.
  • the light signal in the method for processing in the step of filtering, can be filtered in such a way that a light intensity of the light signal in the blocking region is limited to a maximum of 20 percent, in particular not more than 10 percent.
  • the light signal is conditioned so that at least a majority of the electromagnetic waves in the stopband is filtered out.
  • a selective filtering of the light signal or the electromagnetic waves can take place.
  • Such an embodiment offers the advantage that electromagnetic waves with wavelengths, which are not required for the rain detection and for possibly existing further light-based driver assistance functions, can be suppressed or attenuated in the light signal. This minimizes interference with the other light-based driver assistance functions.
  • the light signal can be filtered so that a light intensity of the light signal in the first passband and / or the second passband is at least 50 percent, in particular
  • the light signal may be filtered such that approximately the entire light intensity of the light signal is transmitted in the first passband and / or the second passband.
  • a selective filtering of the light signal or the electromagnetic waves can take place. It is also possible to set which wavelengths have the passbands. Such an embodiment offers the advantage that only electromagnetic waves with wavelengths of interest are transmitted through the passbands, which makes rain detection more reliable and efficient, and reduces interference.
  • the light signal can be filtered in such a way that the blocking region extends over a wavelength range of at least 100 nanometers, in particular favorably at least 150 nanometers or even more preferably at least 200 nanometers of the spectrum.
  • the light signal may be filtered such that the smallest wavelength in the second passband is greater than 750 nanometers, more desirably greater than 800 nanometers, even more preferably greater than 850 nanometers, or more preferably greater than 850 nanometers
  • Such an embodiment has the advantage that a possible influence on the functions or algorithms of other light-based driver assistance systems is the more reduced the farther the spectral range of the passband, and thus z. B. also that of the bandpass used, is shifted in the direction of 1000 nanometers.
  • the light signal in the filtering step, can be filtered such that the second passband covers a wavelength range of at most 200 nanometers, more preferably at most 150 nanometers, even more preferably at most 100 nanometers, or in a particularly favorable case at most 50
  • Nm of the spectrum extends.
  • the light signal in the step of filtering, can be filtered in such a way that a further blocking range for light wavelengths is generated, wherein the second pass band extends over a wavelength range between the stop band and the further stop band.
  • the second passband may have a range of wavelengths that is between a maximum wavelength of the stopband and a smallest wavelength of the other stopband.
  • the further blocking region and / or the blocking region can extend over a larger section of the electromagnetic spectrum than the second passage region.
  • the rain detection method may include a step of emitting light in the infrared spectrum. It can the emitted light should be part of the light signal. Furthermore, a wavelength range of the emitted light may correspond to a wavelength range of the second passband.
  • the method for rain detection in a vehicle may comprise a step of emitting electromagnetic waves, in particular in the infrared spectrum.
  • LED Light-Emitting Diode
  • Such an embodiment offers the advantage that the use of active lighting, for example of the integrated rain sensor on a windshield of the vehicle, makes it possible to vary the required amount of light in order to ensure robust rain detection or detection, for example by the integrated rain sensor , If the spectral range of the optical detection device or infrared LED, and thus also of the additionally used bandpass, is further shifted in the direction of 1000 nanometers, a possible interference influence on other light-based systems, such as image processing algorithms, correspondingly and is reduced thus negligible.
  • FIG. 1 is a schematic representation of a vehicle with a rain detection device according to an embodiment of the present invention
  • FIGS. 2 and 3 are flowcharts of methods according to embodiments of the present invention.
  • FIG. 4 is a diagram of transmittance versus wavelength using a filter according to an embodiment of the present invention.
  • an embodiment includes a "and / or" link between a first feature / step and a second feature / step, this may be read such that the embodiment according to one embodiment includes both the first feature / the first feature and the second feature / the second step and according to another embodiment, either only the first feature / step or only the second feature / step has.
  • the rain detection device 105 has a filter device 110, which may be, for example, an optical filter, and a detection device 120.
  • the recognition device 105 is disposed in the vehicle 100.
  • the vehicle 100 has a vehicle camera 125 and a light source 130.
  • the vehicle camera 125 is arranged between the filter device 1 10 and the detection device 120.
  • the identification device 120 is connected to the vehicle camera 125 via a communication interface, for example via at least one signal line.
  • the recognition device 120 may also be a part of the vehicle camera 125 or the vehicle camera 120 may also be a part of the recognition device 120.
  • a camera unit may be provided which comprises the actual camera function of the vehicle camera 125 as well as the recognition function of the recognition device 120.
  • the light source 130 may, for example, be a light-emitting diode or the like which measures electromagnetic waves in the infrared spectrum, in particular in the near infra-red. rarot, radiates.
  • the light source 130 can be arranged in the vehicle 100 such that the electromagnetic waves emitted by the light source 130 at least partially, for example by reflection, move in the direction of the vehicle camera 125.
  • the filter device 110 is designed to receive a light signal in the form of electromagnetic waves.
  • the light signal may include the electromagnetic waves from the light source 130 and from other light sources, in particular in an environment of the vehicle 100.
  • the filter device 110 is designed to filter the light signal, so that a light wavelength cut-off region and two light wavelength transmission regions are produced.
  • the filter device 110 is designed to carry out the filtering in such a way that the blocking region extends between a first transmission range arranged in the visible spectrum for the human eye and a second transmission range arranged in the infrared spectrum.
  • the filter device 1 10 is also designed to perform a selective filtering of the light signal or the biased electromagnetic waves.
  • the filter device 110 is designed to transmit electromagnetic waves having wavelengths lying in the transmission ranges to the vehicle camera 125.
  • Light signals from the second passband can be used for rain detection.
  • the vehicle camera 125 may be a suitable video camera, still camera, or the like, which may be fixedly mounted in the vehicle 100.
  • Vehicle camera 125 is designed to receive the electromagnetic waves of the light signal transmitted by the filter device 110 and to generate an image signal or image data therefrom.
  • the vehicle camera 125 is also designed to output the image data generated based on the light signal, more specifically based on the electromagnetic waves of the light signal transmitted by the filter device 110, to the recognition device 120.
  • the recognition device 120 is designed to receive the image data generated based on the electromagnetic waves of the light signal transmitted by the filter device 110.
  • the detection device Device 120 is adapted to detect rain, more specifically precipitation or moisture in general, using values or electromagnetic waves of the light signal from the second passband, which are represented by a part of the image data.
  • the recognizer 120 may be configured to output a rain detection signal representing a presence or absence as well as a property of precipitation to which the vehicle is exposed to at least one vehicle unit.
  • a combination of the rain detection device 105 with the vehicle camera 125 and the light source 130 may be used
  • Video system with integrated rain sensor and adapted cut-off filter or CutOff filter are created.
  • the method 200 includes a step of filtering 210 the light signal to produce a light wavelength cutoff region and two light wavelength transmission regions.
  • the filtering step 210 is carried out such that the blocking region is arranged between a first spectrum which is visible to the human eye
  • Passband and a second, arranged in the infrared spectrum passband extends.
  • Values of the light signal from the second passband may be used for rain detection, for example, by a suitable method, such as the method of FIG. 3.
  • the method 200 may be used in conjunction with a device, such as the
  • Rain detection device of Fig. 1, and in particular the filter device of Fig. 1, are advantageously carried out.
  • the rain detection device or filter device of FIG. 1 may be configured to perform the step of the method 200.
  • FIG. 3 shows a flowchart of a method 300 for rain detection in a vehicle, according to an embodiment of the present invention.
  • the method 300 has a step of processing 310 a light signal, for example according to the method according to the exemplary embodiment illustrated in FIG. 2.
  • the method 300 also includes a step of recognizing
  • the method 300 may be advantageously practiced in conjunction with an apparatus such as the rain detection apparatus of FIG. 1.
  • the rain detection device of FIG. 1 may be configured to perform the steps of method 300.
  • FIG. 4 shows a diagram of a transmittance ⁇ over a wavelength ⁇ using a filter according to an embodiment of the present invention.
  • a wavelength ⁇ of electromagnetic waves of a light signal in a range of 350 to more than 1 150 nanometers (nm) is plotted.
  • a transmittance T or a transmission of the electromagnetic waves from 0 to 100 percent is plotted.
  • the filter may be the filter device of FIG. 1.
  • the filter is designed to generate a profile 400, as shown in FIG. 4, of a transmittance for electromagnetic wave wavelengths in at least a partial region of the electromagnetic spectrum.
  • FIG. 4 a first passband 412, a stopband 414, a second passband 416 and a further stopband 480 are shown.
  • the first passband 412 has wavelengths between about 400 nanometers and about 650 nanometers. In the first passband
  • trace 400 shows a transmittance of over 80 percent.
  • the light signal or the electromagnetic waves whose wavelengths are in the first passband 412 are mostly transmitted through the filter.
  • the stopband 414 has wavelengths between about 400 nanometers and about 850 nanometers.
  • the profile 400 shows a transmittance of less than 10 percent.
  • the light signal or the electromagnetic waves whose wavelengths lie in the blocking region 414 are mostly filtered out, suppressed or not transmitted by the filter.
  • the second passband 416 has wavelengths between about 850 nanometers and about 950 nanometers.
  • the trace 400 exhibits a transmittance of over 75 percent and mostly over 80 percent.
  • the second passband 416 may therefore be a bandpass band.
  • the electromagnetic waves, whose wavelengths lie in the second passband 416 and are thus allowed to pass through the filter, can be used for rain detection or precipitation detection.
  • the further stopband 480 has wavelengths between approximately 950 nanometers and more than 1150 nanometers.
  • the profile 400 shows a transmittance of less than 15 percent and mostly less than 10 percent.
  • the light signal or the electromagnetic waves whose wavelengths lie in the further blocking region 418 are mostly filtered out, suppressed or not transmitted by the filter.

Abstract

Procédé (200) de production d'un signal lumineux de détection de pluie dans un véhicule, qui comporte une étape consistant à filtrer (210) le signal lumineux pour produire une zone d'arrêt pour des longueurs d'ondes de lumière et deux zones de passage pour des longueurs d'ondes de lumière. La zone d'arrêt s'étend entre une première zone de passage située dans le spectre visible pour l'oeil humain et une seconde zone de passage située dans le spectre de l'infrarouge. Les valeurs du signal lumineux provenant de la seconde zone de passage sont utilisées pour la détection de la pluie.
PCT/EP2012/064002 2011-08-23 2012-07-17 Procédé de production d'un signal lumineux de détection de pluie dans un véhicule et procédé de détection de pluie dans un véhicule WO2013026628A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011081365A DE102011081365A1 (de) 2011-08-23 2011-08-23 Verfahren zum Aufbereiten eines Lichtsignals zur Regenerkennung in einem Fahrzeug und Verfahren zur Regenerkennung in einem Fahrzeug
DE102011081365.9 2011-08-23

Publications (1)

Publication Number Publication Date
WO2013026628A1 true WO2013026628A1 (fr) 2013-02-28

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PCT/EP2012/064002 WO2013026628A1 (fr) 2011-08-23 2012-07-17 Procédé de production d'un signal lumineux de détection de pluie dans un véhicule et procédé de détection de pluie dans un véhicule

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DE (1) DE102011081365A1 (fr)
WO (1) WO2013026628A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5818600A (en) * 1994-07-12 1998-10-06 Bendicks; Norbert Optoelectronic sensor device for the detection of the degree of wetting of the transparent screen of a motor vehicle with precipitation
US20050035926A1 (en) * 2003-08-12 2005-02-17 Hitachi, Ltd. Image processing system
US20070023613A1 (en) * 1993-02-26 2007-02-01 Donnelly Corporation Vehicle headlight control using imaging sensor
DE102007034606A1 (de) 2007-07-25 2009-01-29 Robert Bosch Gmbh System zum Erfassen optischer Signale mit einem Regensensor und Verfahren

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6573490B2 (en) * 2001-06-28 2003-06-03 Valeo Electrical Systems, Inc. Interleaved mosaic imaging rain sensor
ITTO20020950A1 (it) * 2002-11-05 2004-05-06 Fiat Ricerche Sistema di visione integrato multifunzionale, con matrice

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070023613A1 (en) * 1993-02-26 2007-02-01 Donnelly Corporation Vehicle headlight control using imaging sensor
US5818600A (en) * 1994-07-12 1998-10-06 Bendicks; Norbert Optoelectronic sensor device for the detection of the degree of wetting of the transparent screen of a motor vehicle with precipitation
US20050035926A1 (en) * 2003-08-12 2005-02-17 Hitachi, Ltd. Image processing system
DE102007034606A1 (de) 2007-07-25 2009-01-29 Robert Bosch Gmbh System zum Erfassen optischer Signale mit einem Regensensor und Verfahren

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