Method and apparatus for space variable texture filtering

Details Method and apparatus for space variable texture filtering Method and apparatus for space variable texture filtering

1998-04-22

2000-03-21

Nguyen, Phu K.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

G06T 1700

Patent

active

060408375

ABSTRACT:
A method and apparatus for space variant texture filtering begins when texture coordinates for a given pixel of an object being rendered are received. From the texture coordinates, first and second axis derivatives are determined. When the first and second axis derivatives have differing degrees of magnitude, a determination is made as to whether the first access derivative or the second axis derivative corresponds to a major axis. Next, a number of samples along the major axis are determined based on a logarithmic function of a ratio between the first and second derivatives. Having obtained the number of samples, a separation between the samples is determined based on derivatives along the major axis. Having obtained the number of samples and separation, one of a plurality of related texture maps (e.g., MIP maps) is referenced based on the derivatives along a minor access to obtain the samples. Having obtained the samples, they are filtered based on the number of samples to obtain a filtered texel for the given pixel.

REFERENCES:
patent: 5889526 (1999-03-01), Hashimoto
patent: 5900882 (1999-05-01), Jee
patent: 5903270 (1999-05-01), Gentry et al.
patent: 5917497 (1999-06-01), Saunders
patent: 5933148 (1999-08-01), Oka et al.

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