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Method for producing a geometrical transformation on a video image and devices for carrying out said method

  • US 4,752,828 A
  • Filed: 07/02/1987
  • Issued: 06/21/1988
  • Est. Priority Date: 05/11/1983
  • Status: Expired due to Term
First Claim
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1. A method for producing a geometrical transformation on a video image designated as an initial image, comprising the steps of:

  • identifying each point of the initial image by a plurality of first coordinates (X, Y, O) in a first cartesian reference frame which is designated as a movable reference frame and is related to the initial image;

    representing each point of the initial image by a digital word;

    storing the digital words representing each point of the initial image at a plurality of addressable locations in a storage device having address inputs and a data output, so that a digital word corresponding to the each point and having coordinates (X, Y, O) in the initial image is delivered when address values corresponding to the each point are applied to the storage device address inputs;

    performing a transformation of the initial image using predetermined tranformation parameters to yield a transformed image;

    identifying each point of the transformed image by a plurality of second coordinates (X3, Y3, O) in a second cartesian reference frame which is related to the transformed image and is designated as a fixed reference frame;

    determining a relationship between the second coordinates and the first coordinates, based on the transformation parameters and calculating one computed address value; and

    representing each point of the transformed image by a digital word supplied from the storage device by applying computed address values to the address inputs of said storage device, said computed values being computed as a sum of the computed address value of second coordinates (X3, Y3, O) of said point and, an increment value.

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