×

Method for coordinating multiple fields of view in multi-camera

  • US 5,768,443 A
  • Filed: 12/19/1995
  • Issued: 06/16/1998
  • Est. Priority Date: 12/19/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for precisely coordinating multiple fields of view of a plurality of fixed cameras so as to facilitate determining the distance between features each disposed within a different field of view, the method being especially useful when there is image distortion in each field of view, the method comprising the steps of:

  • at calibration-time,fixing a substantially rigid dimensionally-stable substrate including a plurality of calibration targets each having a reference feature, such that a calibration target is within the field of view of each said camera;

    acquiring relative displacement information regarding at least the linear displacement of each said reference feature with respect to at least one other said reference feature;

    for each camera, acquiring an image of a calibration target to provide a plurality of acquired calibration target images;

    generating an image distortion-correction map for each acquired calibration target image, andat run-time,for each camera, acquiring an image of a portion of said object to provide a plurality of partial object images;

    applying said image distortion-correction map to each partial object image to provide a plurality of corrected partial object images; and

    using said relative displacement information to determine the relative displacement of a first point in a first corrected partial object image with respect to a second point in a second corrected partial object image.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×