Calibration system and method for multi-camera vision system

  • US 9,688,200 B2
  • Filed: 03/03/2014
  • Issued: 06/27/2017
  • Est. Priority Date: 03/04/2013
  • Status: Active Grant
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First Claim
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1. A calibration system for a multi-camera vision system of a vehicle, said calibration system comprising:

  • a first camera disposed at a vehicle and having a first field of view rearward of the vehicle;

    a second camera disposed at the vehicle and having a second field of view generally sideward of the vehicle at a driver side of the vehicle;

    a third camera disposed at the vehicle and having a third field of view generally sideward of the vehicle at a passenger side of the vehicle;

    first, second and third calibration targets disposed at an area at which the vehicle is positioned for a calibrating procedure;

    wherein said first calibration target is encompassed by said first field of view of said first camera;

    wherein said second calibration target is encompassed by said second field of view of said second camera;

    wherein said third calibration target is encompassed by said third field of view of said third camera;

    wherein each of said calibration targets comprises an irregular patterned array of markings, and wherein the pattern of said irregular patterned array of markings is irregular at each of said calibration targets;

    a control comprising an image processor operable to process image data captured by said first, second and third cameras;

    wherein said control stores in memory the respective irregular patterns of said markings of said first, second and third calibration targets;

    wherein said control is operable to process image data captured by said cameras that are being calibrated, and wherein, responsive to processing of image data captured by said cameras, said control determines a particular local irregular pattern of markings of the respective calibration target viewed by a respective one of said cameras;

    wherein said control determines, via comparing determined particular local irregular patterns of markings of the respective calibration target to the respective stored in memory irregular patterns of markings of said first, second and third calibration targets, the position of the respective calibration target relative to the respective camera; and

    wherein, responsive to processing of captured image data, said calibration system is operable to calibrate said multi-camera vision system.

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