EP1938605A1 - System zur kommunikation zwischen einer erfassungseinheit für videobilder und einem bordcomputer für ein kraftfahrzeug - Google Patents

System zur kommunikation zwischen einer erfassungseinheit für videobilder und einem bordcomputer für ein kraftfahrzeug

Info

Publication number
EP1938605A1
EP1938605A1 EP06820278A EP06820278A EP1938605A1 EP 1938605 A1 EP1938605 A1 EP 1938605A1 EP 06820278 A EP06820278 A EP 06820278A EP 06820278 A EP06820278 A EP 06820278A EP 1938605 A1 EP1938605 A1 EP 1938605A1
Authority
EP
European Patent Office
Prior art keywords
carrier frequencies
image acquisition
board computer
video image
video
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Withdrawn
Application number
EP06820278A
Other languages
English (en)
French (fr)
Inventor
Vincent Hubert
Marc Semelle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Comfort and Driving Assistance SAS
Original Assignee
Valeo Etudes Electroniques SAS
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 Valeo Etudes Electroniques SAS filed Critical Valeo Etudes Electroniques SAS
Publication of EP1938605A1 publication Critical patent/EP1938605A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/20—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/22—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles for viewing an area outside the vehicle, e.g. the exterior of the vehicle
    • B60R1/23—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles for viewing an area outside the vehicle, e.g. the exterior of the vehicle with a predetermined field of view
    • B60R1/26—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles for viewing an area outside the vehicle, e.g. the exterior of the vehicle with a predetermined field of view to the rear of the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
    • B60R2300/10—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used
    • B60R2300/105—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used using multiple cameras
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
    • B60R2300/40—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the details of the power supply or the coupling to vehicle components
    • B60R2300/408—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the details of the power supply or the coupling to vehicle components using a data bus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
    • B60R2300/80—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the intended use of the viewing arrangement
    • B60R2300/8066—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the intended use of the viewing arrangement for monitoring rearward traffic

Definitions

  • the present invention relates to a communication system between a video image acquisition unit and an on-board computer for a motor vehicle and a communication method.
  • the video image acquisition unit generally comprises a video camera placed for example at the rear of the vehicle.
  • the onboard computer is generally connected to a screen viewing the video image from the image acquisition unit.
  • the driver can see obstacles in the rear of the vehicle from the image of the screen.
  • a video image acquisition unit transmitting video data to the on-board computer in the form of an analog signal modulating a supply current flowing in the power supply circuit.
  • the video image acquisition unit and the on-board computer also exchange control data from the video image acquisition unit, for example to control a parameter or position adjustment of the video acquisition unit. acquisition of video images, activation or deactivation of the video image acquisition unit, etc.
  • the transmission of this control data is done on one or more distinct lines of the video transmission line.
  • the communication system between the video image acquisition unit and the on-board computer is relatively complex.
  • the object of the invention is to simplify the communication system between the image acquisition unit and the on-board computer while allowing a reliable transmission of control data and video data.
  • the subject of the invention is a communication system of the aforementioned type, characterized in that it comprises first means for shaping a set of video data in the form of a first digital signal transmitted by a first set of carrier frequencies and second means for shaping a a control data set in the form of a second digital signal transmitted by a second set of carrier frequencies, the number of carrier frequencies of the first set being greater than the number of carrier frequencies of the second set.
  • first means for shaping a set of video data in the form of a first digital signal transmitted by a first set of carrier frequencies and second means for shaping a a control data set in the form of a second digital signal transmitted by a second set of carrier frequencies, the number of carrier frequencies of the first set being greater than the number of carrier frequencies of the second set.
  • the communication system is simpler and more reliable because it uses data transmission in the form of digital signals in which it is relatively easy to include means for detecting and correcting errors.
  • a communication system may further comprise one or more characteristics according to which: the system comprises means for selecting the carrier frequencies of the first set of carrier frequencies, according to a predefined criterion; the predefined criterion is related to a test data transmission error rate between the on-board computer and the video image acquisition unit; the predefined criterion is related to an attenuation rate of a characteristic of a test signal transmitted between the onboard computer and the video image acquisition unit; the video image acquisition unit comprises means for forming an optical image with an angular field greater than 120 °; the means for forming the optical image comprise a "fish-eye" type objective.
  • the subject of the invention is also a method of communication between at least one video image acquisition unit and an on-board computer for a motor vehicle, of the type in which power line data is transmitted between the data transmission unit.
  • acquisition of video images and the on-board computer characterized in that a set of video data is formed in the form of a first digital signal transmitted by a first set of carrier frequencies and a data format is formed.
  • a control data set in the form of a second digital signal transmitted by a second set of carrier frequencies, the number of carrier frequencies of the first set being greater than the number of carrier frequencies of the second set.
  • a communication method may further comprise one or more characteristics according to which: the carrier frequencies of the first set are selected according to a predefined criterion, before each transmission of at least a part of the first set video data; selecting the carrier frequencies of the first and second sets of carrier frequencies from at least 100 successive carrier frequencies; the predefined criterion is related to a test data transmission error rate between the on-board computer and the video image acquisition unit; the predefined criterion is linked to an attenuation rate of a characteristic of a test signal transmitted between the on-board computer and the video image acquisition unit; for communication between at least two video image acquisition units and the on-board computer, a set of control data is transmitted to a first of these two image acquisition units and acquires a set of video data by means of the first unit, while transmitting to the attention of the on-board computer a set of video data acquired by the second of the two image acquisition units.
  • FIG. 1 is a schematic view of a motor vehicle comprising a communication according to a first embodiment of the invention
  • FIG. 2 is a graph representing a frequency spectrum of the first and second digital signals respectively corresponding to video data and control data
  • Fig. 3 is a schematic view of a screen of the communication system shown in Fig. 1 for displaying a useful video image
  • Figure 4 is a view similar to Figure 3 showing another useful video image
  • Figure 5 is a view similar to Figure 1 showing a motor vehicle provided with a communication system according to a second embodiment of the invention
  • Fig. 6 is a graph showing a succession of digital signals of video and control data transmitted in the communication system shown in Fig. 5
  • Figure 7 is a view similar to Figure 1 of a motor vehicle provided with a communication system according to a third embodiment of the invention
  • Fig. 8 is a view of the screen showing a useful image obtained from the communication system shown in Fig. 7.
  • FIG. 1 shows a motor vehicle equipped with a video data processing device according to a first embodiment of the invention.
  • This processing device is designated by the general reference 10.
  • the processing device 10 comprises a communication system 12 between a video image acquisition unit 14 and an on-board computer 16 of the motor vehicle.
  • the computer 16 is connected to a conventional screen 18 for displaying a useful video image visible to the driver of the vehicle.
  • the communication system 12 comprises carrier data transmission means comprising a data transmission line 20 forming a power supply circuit for various components of the motor vehicle, in particular the video image acquisition unit 14. .
  • the communication system 12 also comprises first means 22, for example a conventional module for power-line data transmission, intended to form a set of video data in the form of a first digital signal and second means 24, for example, a second conventional power-line data transmission module for formatting a set of control data as a second digital signal.
  • the first digital signal (video data) is transmitted by a first set 26 of carrier frequencies and the second digital signal (control data) is transmitted by a second set 28 of carrier frequencies.
  • the video image acquisition unit 14 comprises means 30 for forming an optical image comprising, in the first embodiment described, a lens of the type "Fish-eye". This objective makes it possible to form an optical image with an angular field greater than 120 °.
  • the video image acquisition unit 14 also comprises conventional means 32 for generating an initial video image from the optical image formed by the means 30.
  • the video image acquisition unit 14 further comprises means for creating the useful video image from the initial video image generated by the means 32.
  • These means of creating the useful video image comprise means 34 of adjustable selection of at least a portion of the initial video image, the selected portion constituting at least a portion of the useful video image.
  • the video image acquisition unit 14 also comprises means 36 for selecting the carrier frequencies of the first set 26 of carrier frequencies (data signal), according to a predefined criterion.
  • the means 36 for selecting carrier frequencies could be arranged in another element of the communication system 12.
  • data is transmitted by carrier current, using the transmission line 20, between the video image acquisition unit 14 and the on-board computer 16.
  • the selection of the portion of the initial video image is adjusted to take account of variations in position of the image acquisition unit 14 using software means comprising the on-board computer. and a classic user interface.
  • FIG. 3 shows schematically by arrows the possible abscissa and ordinate settings of the useful image displayed on the screen 18 by adjusting the initial video image portion selection.
  • the adjustable selection means 34 make it possible to select at least two parts of the initial video image, for example two disjoint lateral spherical angular sectors ⁇ 1 and ⁇ 2 of the optical image, as represented in FIG.
  • the selected portions of the initial video image constitute at least two portions P1, P2 of the useful image, as shown in FIG. 4.
  • the two portions P1, P2 of the useful image are optionally separated by a vertical strip V signaling to the user that the portions P1, P2 of useful images come from two disjoint optical image parts.
  • the selected portion of the initial video image forms a video data set which is formed into the first digital signal using the means 22.
  • This first signal is intended to be transmitted to the screen 18 via computer 16.
  • the carrier frequencies of the first set 26 of carrier frequencies are selected using means 36 according to a predefined criterion.
  • This criterion is, for example, linked to a test data transmission error rate between the on-board computer 16 and the video image acquisition unit 14.
  • the test data is transmitted on all the carrier frequencies provided for the transmission of the video data and, as a function of a transmission error rate of these test data, the most disturbed carrier frequencies are eliminated so as to generally keep only about 80% of the possible carrier frequencies.
  • the criterion is related to an attenuation rate of a characteristic of a test signal transmitted between the on-board computer 16 and the video image acquisition unit 14.
  • the characteristic of the signal may be an amplitude of this test signal.
  • the video image acquisition unit 14 and the on-board computer 16 also exchange control data from the video image acquisition unit 14, for example to control a setting of parameters or of position of the video image acquisition unit, activation or deactivation of the video image acquisition unit, etc.
  • the unit 14 for acquiring video images is controlled, in particular so that it proceeds to the acquisition of a new initial video image.
  • a control data set is formed by the means 24 in the form of the second digital signal transmitted from the on-board computer 16 to the unit 14 by the second set of carrier frequencies 28.
  • the number of carrier frequencies of the first set 26 is greater than the number of carrier frequencies of the second set 28 (order data).
  • the carrier frequencies of the first and second sets 26 and 28 of carrier frequencies are selected from at least 100 successive carrier frequencies, for example 128 carrier frequencies.
  • the 128 successive carrier frequencies are distributed for example between 2 and 30 MHz.
  • the carrier frequencies of the second set 28 are distributed to the left, right and substantially in the middle of the carrier frequencies of the first set 26 (video data).
  • the carrier frequencies of the second set 28 could be located only to the left of the carrier frequencies of the first set 26 or only to the right of the carrier frequencies of the first set 26 or only between carrier frequencies of this first set 26.
  • FIGS. 5 to 8 show a communication system 12 according to second and third embodiments of the invention.
  • elements similar to those of the preceding figures are designated by identical references.
  • the communication system 12 according to the second embodiment shown in FIG. 5 comprises two video acquisition units 14A, 14B analog to the video image acquisition unit 14 described above. These two units 14A, 14B are connected to the same line 20 for the power line data transmission.
  • a set E1 of control data is transmitted to a first 14A of these two image acquisition units and an E2 set of video data is acquired at the same time.
  • an E2 set of video data is acquired at the same time.
  • first unit 14A while transmitting to the attention of the on-board computer 16 a set E3 of video data acquired by the second 14B of the two image acquisition units.
  • a set of control data E1 ' is transmitted to the attention of the second unit 14B and a set E2' of video data is acquired by means of the first unit 14A, while a set E3 'of video data acquired by the first unit 14A, etc., is transmitted to the on-board computer 16.
  • FIG. 6 disassociates the transmission of the data set EV with respect to the transmission of the data set E3.
  • the emission of the set EV will succeed the emission of the set E3.
  • each unit 14A, 14B generates an initial video image and the adjustable selection means 32 of each unit 14A, 14B select a portion of the corresponding initial video image.
  • the two selected portions of the two initial video images constitute at least two portions P1, P2 of the useful image, as shown in FIG. 4.
  • the communication system 12 according to the third embodiment shown in FIG. 7 comprises three video acquisition units 14A, 14B, 14C analogous to the video image acquisition unit 14 described above.
  • the transmission of a set of control data to a first of the three image acquisition units 14A, 14B, 14C and the acquisition of a set of video data by this first of the three image acquisition units can be performed while a second of the three image acquisition units transmits, for the attention of the on-board computer 16, a video data set acquired by this second 14B of the two image acquisition units.
  • the useful image displayed on the screen 18 may consist of two image parts P1, P2 coming from two of the three acquisition acquisition units 14A, 14B, 14C. images, especially when the optical image forming means of the two units 14A, 14B, 14C concerned have partially overlapping angular fields, as shown in FIG. 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Optical Communication System (AREA)
  • Traffic Control Systems (AREA)
EP06820278A 2005-10-12 2006-10-11 System zur kommunikation zwischen einer erfassungseinheit für videobilder und einem bordcomputer für ein kraftfahrzeug Withdrawn EP1938605A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0510423A FR2891968B1 (fr) 2005-10-12 2005-10-12 Systeme de communication entre une unite d'acquisition d'images video et un ordinateur de bord pour un vehicule automobile
PCT/FR2006/051016 WO2007042730A1 (fr) 2005-10-12 2006-10-11 Systeme de communication entre une unite d'acquisition d'images video et un ordinateur de bord pour un vehicule automobile

Publications (1)

Publication Number Publication Date
EP1938605A1 true EP1938605A1 (de) 2008-07-02

Family

ID=36655097

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06820278A Withdrawn EP1938605A1 (de) 2005-10-12 2006-10-11 System zur kommunikation zwischen einer erfassungseinheit für videobilder und einem bordcomputer für ein kraftfahrzeug

Country Status (5)

Country Link
US (1) US20090237506A1 (de)
EP (1) EP1938605A1 (de)
JP (1) JP2009511342A (de)
FR (1) FR2891968B1 (de)
WO (1) WO2007042730A1 (de)

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Also Published As

Publication number Publication date
FR2891968A1 (fr) 2007-04-13
FR2891968B1 (fr) 2008-01-18
WO2007042730A1 (fr) 2007-04-19
US20090237506A1 (en) 2009-09-24
JP2009511342A (ja) 2009-03-19

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