×

Method for exploring viewpoint and focal length of camera

  • US 20030090586A1
  • Filed: 10/19/2001
  • Published: 05/15/2003
  • Est. Priority Date: 09/17/2001
  • Status: Active Grant
First Claim
Patent Images

1. A method for exploring viewpoint and focal length of camera that has an axis-symmetrical nonlinear-distortive lens, the method comprises:

  • providing a calibration target with a test pattern composed of at least one geometric figure;

    aiming the center of the test pattern at an optic axis of a lens in the camera; and

    searching a pinpoint along the optic axis to enable at least one image height on an image plane which is related to the geometric figure and the corresponding zenithal angle between the incident rays of light and the optic axis both fit in with a projection model.

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