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Graphics system having a super-sampled sample buffer with hot spot correction

  • US 6,771,272 B2
  • Filed: 12/29/2000
  • Issued: 08/03/2004
  • Est. Priority Date: 03/17/2000
  • Status: Expired due to Term
First Claim
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1. A graphics system for flattening a distribution of light energy perceived by a viewer of a displayed image generated on a display surface by one or more display devices, the graphics system comprising:

  • a graphics processor which is operable (a) to receive graphics data, (b) to select sample positions in a two-dimensional viewport, and (c) to compute sample values at the sample positions based on the received graphics data;

    a sample buffer coupled to said graphics processor and configured to store said sample values;

    a sample-to-pixel calculation unit coupled to said sample buffer and operable to select a first plurality of first virtual pixel positions in the two-dimensional viewport, wherein, for each first virtual pixel position in said first plurality, said sample-to-pixel calculation unit is operable (d) to access one or more sample values corresponding to sample positions in a neighborhood of the first virtual pixel position from the sample buffer, (e) to filter said one or more sample values to generate a first pixel value, (f) to scale the first pixel value by an intensity correction value which depends on the first virtual pixel position in the 2-D viewport, and (g) to provide the scaled first pixel value as output to a first projection device;

    wherein the intensity correction value is configured to correct for a non-uniformity in the perceived distribution of light by the viewer.

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