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Apparatus and method for mip-map generation using low-pass filtering based on resolution ratio

  • US 5,566,284 A
  • Filed: 12/21/1994
  • Issued: 10/15/1996
  • Est. Priority Date: 12/22/1993
  • Status: Expired due to Term
First Claim
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1. An apparatus for MIP-map image generation, which receives an original image of texture and reduces the original image in size in accordance with a size of a polygon to which the texture is mapped, the apparatus comprising:

  • image dividing means for receiving the original image and for dividing the original image, to generate image blocks;

    a spatial transformation means for transforming each of the image blocks in a spatial domain into spatial frequency image block in a spatial frequency domain;

    image storing means for storing the spatial frequency image data block;

    MIP-map resolution calculating means for calculating a size of a polygon to be displayed on a display, and for calculating a resolution corresponding to the size of the polygon;

    low-pass filter means for removing, from the spatial frequency image data block, components having higher frequencies which are higher than a predetermined frequency corresponding to the resolution obtained by the MIP-map resolution calculating means, to generate a filtered spatial frequency image data block; and

    inverse spatial transformation means for receiving the filtered spatial frequency image data block, and for transforming the filtered spatial frequency image data block into a filtered image block in the spatial domain.

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