Computer graphics processing and selective visual display system – Computer graphics processing – Three-dimension
Patent
1996-09-03
1999-05-18
Fetting, Anton W.
Computer graphics processing and selective visual display system
Computer graphics processing
Three-dimension
345427, G06T15/50
Patent
active
059055030
ABSTRACT:
A 3-D image synthesis apparatus maintains an "object database" (OBJ) defining a 3-D world to be represented on a 2-D display screen (DIS). The object database includes light sources (LS) which have non-uniform distributions of illumination. To simplify calculations of the illumination of an object surface (P.sub.O), the apparatus pre-stores (606) one or more look-up tables. The look-up table (606) is then addressed by polar coordinates (.theta.,.phi.) calculated per pixel of the output image, to incorporate the dependency of illumination on direction. Several tables may be stored for each light source, each representing the illumination pattern at a different distance (D) from the light source. Smooth variations can be achieved by interpolation between integer values of .theta.,.phi. and D.
REFERENCES:
patent: 4709231 (1987-11-01), Sakaibara et al.
patent: 4943938 (1990-07-01), Aoshima et al.
patent: 4953107 (1990-08-01), Hedley et al.
patent: 4982342 (1991-01-01), Moribe et al.
"Using the Video Lookup Table for Reflectivity Calculations: Specific Techniques and Graphic Results" Computer Graphics and Image Processing vol. 17, No. 3, Nov. 1981 pp. 249-261.
"A Comprehensive Light-Source Description for Computer Graphics" Verbeck et al, IEEE CGEA , Jul. 1984, pp. 66-75.
"Lighting Controls for Synthetic Images" Warn, Computer Graphics, vol. 17, No. 3, (Jul. 1993) pp. 13-21.
Computer Graphics: Principles and Practice, Foley et al, pp. 741-744.
"Shading Models for Point and Linear Sources" Nishita et al, ACM Translations on Graphics, vol. 4, No. 2, Apr. 1985, pp. 124-146.
"Pyramidal Parametrics" L. Williams, Computer Graphics, vol. 17, No. 3, (Jul., 1983), pp. 1-11.
"Texture and Reflection in Computer Generated Images" J.F. Blinn et al, Communications of the ACM, vol. 19, No. 10, Oct. 1976, pp. 542-547.
Fetting Anton W.
Slobod Jack D.
U.S. Philips Corporation
LandOfFree
Rendering an image using lookup tables giving illumination value does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rendering an image using lookup tables giving illumination value, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rendering an image using lookup tables giving illumination value will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1763387