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Method for rapid generation of photo-realistic imagery

  • US 4,985,854 A
  • Filed: 05/15/1989
  • Issued: 01/15/1991
  • Est. Priority Date: 05/15/1989
  • Status: Expired due to Fees
First Claim
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1. A method for providing rapid generation of photorealistic imagery for use in a digital display system including a memory which contains first and second ortho-rectified data layers wherein the first data layer comprises a digitized photograph of known resolution and spacing values and the second layer comprises digitized elevation data corresponding to the photograph in the first data layer, the method comprising the steps of:

  • (a) scanning corresponding portions of the first and second data layers out of memory;

    (b) dividing the scanned portions into plurality of 2 pixel by 2 pixel cells so as to form the cells using adjacent pixels for the first data layer wherein each cell is comprised of four vertices and wherein each of the four vertices is described by information stored in the memory including;

    (i) an X, Y coordinate, and(ii) a Z coordinate representative of its elevation which is known from the elevation layer so as to allow the vertices to lie in different planes;

    (c) further dividing the cells into triangular sections having vertices;

    (d) removing hidden surfaces from the scanned porttion(e) projecting the vertices into the viewscreen under the coordinates in the second layer and the known values and(f) shading the area subtended by the projected vertices.

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