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Electro-optical target and background simulation

  • US 5,495,562 A
  • Filed: 04/12/1993
  • Issued: 02/27/1996
  • Est. Priority Date: 04/12/1993
  • Status: Expired due to Term
First Claim
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1. An electro-optical target and background simulation system for generating synthetic images, said system comprising:

  • a background database from which a simulated background is generated and which comprises data defining an image scene that comprises a pyramid whose boundary specifies the extent of the image scene, and wherein the pyramid is divided into a pyramid base defining a below horizon background surface and pyramid sides defining an above horizon background surface, and wherein each surface comprises triangular regions of uniform texture;

    a target database comprising a plurality of triangular object facets representative of simulated objects that are adapted to overlay the background generated from the background database; and

    processing means coupled to the background and target databases for processing data derived therefrom and for generating the synthetic images, and wherein the processing means comprises;

    radiance mapping means for providing a surface radiance map of the image scene;

    coordinate transformation means for processing data indicative of target and missile center-of-mass positions and orientations and for providing a three dimensional seeker image frame;

    shadowing means for determining shadowed areas on an object;

    hidden surface removal means that removes object facets that are obscured from the view of the seeker;

    perspective projection means for generating a two dimensional image plane by perspective three dimensional mapping from the background and target databases to a focal plane of the seeker; and

    optical convolution means for generating a two dimensional image on the focal plane of the seeker by convolving the projected image with an optical point spread function of the seeker to generate a radiance distribution on the focal plane of the seeker, which radiance distribution comprises the synthetic image.

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