Texture mapping with improved technique for selecting an appropr

Details Texture mapping with improved technique for selecting an appropr Texture mapping with improved technique for selecting an appropr

1997-11-17

2000-11-21

Zimmerman, Mark K.

Computer graphics processing and selective visual display system

Computer graphics processing

Adjusting level of detail

345430, G06T 1700

Patent

active

061510297

ABSTRACT:
A device is provided for generating output signals representing an image comprising a plurality of pixels, each pixel having a respective location within the image. The device comprises one or more signal paths adapted to receive a first signal representing position of a surface to be displayed in an image and a second signal representing texture of at least a portion of the surface. A processing circuitry is adapted to determine a correspondence between a respective pixel in the image and an area of the texture. The correspondence is determined according to the first and second signals and position of the respective pixel within the image, and wherein the correspondence includes a homogeneous coordinate. The processing circuitry further generates a third signal representing the respective pixel. The third signal is generated by interpolating a plurality of filtered representations of the texture according to a level obtained from a function of the homogeneous coordinate, and generates a respective output signal representing information conveyed by the third signal. The second signals represent texture of a portion of the surface that is triangular and has three vertices with corresponding homogeous coordiates w.sub.0, w.sub.1 and w.sub.2, respectively, and the function d of the homogeneous coordiate w is d=d+2 log(q)-2 log(q), where d is a constant representing an average level across the triangular portion, q=1/w, q.sub.0 =1/w.sub.0, q.sub.1 =1/w.sub.1, q.sub.2 =1/w.sub.2, and q=.sup.3 .sqroot.(q.sub.0 q.sub.1 q.sub.2).

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