Method for displaying video images for a vehicular vision system

  • US 10,574,885 B2
  • Filed: 08/20/2018
  • Issued: 02/25/2020
  • Est. Priority Date: 05/06/2013
  • Status: Active Grant
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First Claim
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1. A method for displaying video images for a vehicular vision system, said method comprising:

  • providing a plurality of cameras at a vehicle so as to have respective fields of view exterior of the vehicle;

    wherein the provided plurality of cameras comprises a forward viewing camera having at least a forward field of view forward of the vehicle, a rearward viewing camera having at least a rearward field of view rearward of the vehicle, a driver-side sideward viewing camera having at least a sideward field of view at a driver side of the vehicle and a passenger-side sideward viewing camera having at least a sideward field of view at a passenger side of the vehicle;

    providing an electronic control unit at the vehicle;

    wherein each of the provided plurality of cameras is operable to (i) automatically control its exposure, gain and white balance responsive to a first control signal received from the electronic control unit and (ii) disable automatic control of its exposure, gain and white balance responsive to a second control signal received from the electronic control unit;

    wherein one of the provided plurality of cameras functions as a master camera and other cameras of the provided plurality of cameras function as slave cameras;

    wherein, during a forward driving maneuver of the vehicle, the forward viewing camera functions as the master camera and at least the driver-side sideward viewing camera and the passenger-side sideward viewing camera function as slave cameras;

    during the forward driving maneuver of the vehicle with the forward viewing camera functioning as the master camera, (i) enabling, via the first signal from the electronic control unit, automatic control of exposure, gain and white balance of the forward viewing camera, (ii) disabling, via respective second signals from the electronic control unit, automatic control of exposure, gain and white balance of at least the driver-side sideward viewing camera and the passenger-side sideward viewing camera, and (iii) controlling, via the electronic control unit, exposure, gain and white balance of at least the driver-side sideward viewing camera and the passenger-side sideward viewing camera in accordance with the enabled automatic control of the forward viewing camera;

    wherein, during a reversing maneuver of the vehicle, the rearward viewing camera functions as the master camera and at least the driver-side sideward viewing camera and the passenger-side sideward viewing camera function as slave cameras;

    during the reversing maneuver of the vehicle with the rearward viewing camera functioning as the master camera, (i) enabling, via the first signal from the electronic control unit, automatic control of exposure, gain and white balance of the rearward viewing camera, (ii) disabling, via respective second signals from the electronic control unit, automatic control of exposure, gain and white balance of at least the driver-side sideward viewing camera and the passenger-side sideward viewing camera, and (iii) controlling, via the electronic control unit, exposure, gain and white balance of at least the driver-side sideward viewing camera and the passenger-side sideward viewing camera in accordance with the enabled automatic control of the rearward viewing camera;

    processing image data captured by the provided plurality of cameras;

    responsive to processing of captured image data, synthesizing a composite image derived from image data captured by at least the master camera and the slave cameras;

    wherein the composite image comprises a bird'"'"'s eye view image derived from image data captured by at least the master camera and the slave cameras;

    wherein exposure, gain and white balance parameters of the master camera are used at least by the master camera and the slave cameras;

    wherein exposure, gain and white balance parameters of the master camera are carried between the master camera and the electronic control unit;

    sending, via the electronic control unit, exposure, gain and white balance parameters carried between the master camera and the electronic control unit to at least the slave cameras; and

    displaying the composite image at a display device of the vehicle for viewing by a driver of the vehicle, wherein borders of adjacent image sections of the composite image, when displayed at the display device of the vehicle for viewing by the driver of the vehicle, appear uniform in at least one of (i) brightness at the borders of the image sections and (ii) color at the borders of the image sections.

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