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Method for compensating hardware misalignments in a camera

  • US 8,405,731 B2
  • Filed: 02/12/2008
  • Issued: 03/26/2013
  • Est. Priority Date: 02/19/2007
  • Status: Active Grant
First Claim
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1. A method for compensating hardware misalignments in a camera comprising a maneuverable part and a fixed part, wherein said maneuverable part is controlled by a steering motor system and comprises a camera block, said method comprising:

  • receiving mechanical coordinates from said steering motor system, wherein said mechanical coordinates correspond to a pan and tilt position, said pan and tilt position having a complementary pan and tilt position, wherein the complementary pan and tilt position is a position that is reached by the steering motor system rotating the maneuverable part 180 degrees around a pan axis and rotating the camera block an angle corresponding to −

    2Tu

    180 degrees around a tilt axis, wherein Tu is in the range of 0 to −

    90 degrees and Tu is the tilt coordinate of the mechanical coordinates;

    reading pre-determined calibration data corresponding to said received mechanical coordinates from a memory comprised in said camera, wherein said pre-determined calibration data comprises a horizontal compensation component and a vertical compensation component, wherein said compensation components represent the difference between the mechanical coordinates of the pan and tilt position and the mechanical coordinates of an intermediate position, which is between the pan and tilt position and the complementary pan and tilt position; and

    determining compensated coordinates based upon said received mechanical coordinates and said pre-determined calibration data.

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