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Arithmetic unit for image transformation and monitoring system

  • US 6,574,376 B1
  • Filed: 09/30/1999
  • Issued: 06/03/2003
  • Est. Priority Date: 02/12/1999
  • Status: Expired due to Fees
First Claim
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1. An arithmetic unit for image transformation for transforming a fisheye image on a fisheye image face obtained by using a fisheye lens into a plane image for display on a plane image face, comprising:

  • a first coordinate calculating unit for obtaining first projection coordinates on an imaginary hemispheric face from coordinates on the plane image face, wherein the first projection coordinates are derived by projecting the coordinates on the plane image face onto the imaginary hemispheric face, said first coordinate calculating unit outputting the first projection coordinates; and

    a second coordinate calculating unit for receiving the first projection coordinates and obtaining therefrom second projection coordinates on the fisheye image face, wherein the second projection coordinates are derived by projecting the first projection coordinates onto the fisheye image face.

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