Computer graphics processing and selective visual display system – Computer graphics processing – Three-dimension
Reexamination Certificate
2005-05-31
2005-05-31
Nguyen, Phu K. (Department: 2671)
Computer graphics processing and selective visual display system
Computer graphics processing
Three-dimension
Reexamination Certificate
active
06900805
ABSTRACT:
The Torrance-Sparrow model of off-specular reflection is recast in a significantly simpler and more transparent form in order to render a spherical-harmonic decomposition more feasible. By assuming that a physical surface consists of small, reflecting facets whose surface normals satisfy a normal distribution, the model captures the off-specular enhancement of the reflected intensity distribution often observed at large angles of incidence and reflection, features beyond the reach of the phenomenological broadening models usually employed. In passing we remove a physical inconsistency in the original treatment, restoring reciprocity and correcting the dependence of reflectance on angle near grazing incidence. It is noted that the results predicted by the model are relatively insensitive to values of its one parameter, the width of the distribution of surface normals.
REFERENCES:
patent: 5495562 (1996-02-01), Denney et al.
patent: 5923334 (1999-07-01), Luken
Oren et al., Generalization of Lambert's Reflectance Model, Jul. 1994, Proceedings on 21st conferences on Computer Graphics, p.p. 1-30.*
Boivin et al., Image-Based Rendering of Diffuse, Specular and Glossy Surfaces from a Single Image, ACM SIGGRAPH 2001 Aug. 2001, pp. 107-116.*
Brelstaff, et al., “Detecting Specular Reflections Using Lambertian Constraints,” International Conference on Computer Vision, pp. 297-302 (1988).
Cabral et al., “Bidirectional Reflection Functions from Surface Bump Maps,” Computer Graphics, vol. 21, No. 4, pp. 273-281 (1987).
Coleman et al., “Obtaining 3-Dimensional Shape of Textured and Specular Surfaces Using Four-Source Photometry,” Physics-Based Vision Principles and Practice, Shape Recovery, pp. 180-199 (1992).
Hallinan, “A Low-Dimensional Representation of Human Faces for Arbitrary Lighting Conditions,” IEEE Conf. on Computer Vision and Pattern Recognition, pp. 995-999 (1994).
Marschner et al., “Image-Based BRDF Measurement Including Human Skin,” In Proceedings of 10th Eurographics Workshop on Rendering, pp. 139-152 (1999).
Ramamoorthi et al., “On the Relationship Between Radiance and Irradiance: Determining the Illumination from Images of a Convex Lambertian Object,” Journal Optical Society of America A, vol. 18, No. 10, pp. 2448-2459 (2001).
Ramamoorthi et al., “A Signal-Processing Framework for Inverse Rendering,” Computer Graphics Proceedings, Annual Conference Series, pp. 117-128 (2001).
Yuille et al., “Determining Generative Models of Objects Under Varying Illumination: Shape and Albedo from Multiple Images Using SVD and Integrability,” International Journal of Computer Vision, pp. 1-35 (1999).
Basri et al., “Lambertian Reflectance and Linear Subspaces,” IEEE International Conference on Computer Vision, II, pp. 282-290 (2001).
Belhumeur, et al., “What is the Set of Images of an Object Under all Possible Illumination Conditions?” International Journal of Computer vision, vol. 28, No. 3, pp. 245-260 (1998).
Hayakawa, “Photemetric Stereo Under a Light Source with Arbitrary Motion,” Journal of Optical Society of America, vol. 11, No. 11, pp. 2079-2089 (1994).
Koenderink et al., “The Generic Bilinear Calibration-Estimation Problem,” International Journal of Optical Computer Vision, vol. 23, No. 3, pp. 217-234 (1997).
Langer, “When Shadows Become Interreflections,” International Journal of Computer Vision, vol. 34, No. 2-3, pp. 193-204 (1999).
Rose, “Elementary Theory of Angular Momentum,” John Wiley & Sons, New York, pp. 228-234 (1957).
Shashua, “On Photometric Issues in 3D Visual Recognition from a Single 2D Image,” International Journal of Computer Vision, vol. 21, No. 1-2, pp. 99-122 (1997).
Blinn, “Models of Light Reflection for Computer Synthesized Pictures,” Computer Graphics, pp. 192-198 (1977).
Rense, “Polarization Studies of Light Diffusely Reflected from Ground and Etched Glass Surface,” Journal of the Optical Society of America, vol. 40, No. 1, pp. 55-59 (1950).
Basri et al., “Lambertian Reflectance and Linear Subspaces,” NEC Research Institute, Inc. Technical Report No. 2000-112 (2000).
Basri et al., “Lambertain Reflectance and Linear Subspaces,” NEC Research Institute, Inc. Technical Report No. 2000-172R (2000).
Jacobs David W.
Thornber Karvel K.
NEC Laboratories America, Inc.
Nguyen Phu K.
LandOfFree
Torrance-sparrow off-specular reflection and linear... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Torrance-sparrow off-specular reflection and linear..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Torrance-sparrow off-specular reflection and linear... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3457316