Timothy D Hawkins

US Patent:

6685326, Feb 3, 2004

Filed:

Jun 7, 2002

Appl. No.:

10/165371

Inventors:

Paul E. Debevec - Marina del Rey CA
Timothy S. Hawkins - Marina del Rey CA

Assignee:

University of Southern California - Los Angeles CA

International Classification:

G03B 1507

US Classification:

362 11, 362 5

Abstract:

A lighting simulation process for simulating the lighting of a subject at a location in a scene. Scene illumination data is created that specifies the illumination that the scene provides at the location at which the subject is to be simulated from a plurality of spatial directions. Subject illumination data is created that specifies the appearance of the subject when illuminated from a plurality of different spatial directions. The subject is then illuminated as if at the location in the scene by combing the scene illumination data with the subject illumination data.

US Patent:

6888552, May 3, 2005

Filed:

Jun 10, 2002

Appl. No.:

10/170087

Inventors:

Paul E. Debevec - Marina del Rey CA, US
Timothy S. Hawkins - Marina del Rey CA, US

Assignee:

University of Southern California - Los Angeles CA

International Classification:

G09G005/02

US Classification:

345589, 345605

Abstract:

A high dynamic range image editing system for editing an image file having pixels spanning a first range of light intensity levels in an image editing system that only displays differences in the light intensity levels of pixels within a second range of light intensity levels that is less than the first range of light intensity levels, without reducing the range of light intensity levels in the image file.

US Patent:

6919962, Jul 19, 2005

Filed:

Feb 7, 2004

Appl. No.:

10/774173

Inventors:

Paul E. Debevec - Marina del Rey CA, US
Andrew J. Gardner - Marina del Rey CA, US
Timothy S. Hawkins - Marina del Rey CA, US

Assignee:

University of Southern California - Los Angeles CA

International Classification:

G01N021/55

US Classification:

356445

Abstract:

A reflectometry apparatus and method is presented that allow the diffuse and specular reflectance parameters of an object to be independently and reliably measured, and that allow the variations in surface normal and surface height to be estimated. An extended light source having an elongated configuration, for example a linear cylindrical light source such as a neon tube, is moved across the surface of an object while a digital camera detects the reflected light to acquire a series of images of the object surface. A reflectance trace table is synthesized for a range of model parameters using a virtualized rendition of the linear light source. For each pixel, the observed reflectances are compared to the synthesized reflectance trace table, to determine the reflectance parameters that most closely match the observed data.

US Patent:

7486299, Feb 3, 2009

Filed:

Feb 1, 2005

Appl. No.:

11/049834

Inventors:

Paul E. Debevec - Marina del Rey CA, US
Timothy S. Hawkins - Marina del Rey CA, US

Assignee:

University of Southern California - Los Angeles CA

International Classification:

G09G 5/02

US Classification:

345589, 345605, 382162

Abstract:

A high dynamic range image editing system for editing an image file having pixels spanning a first range of light intensity levels in an image editing system that only displays differences in the light intensity levels of pixels within a second range of light intensity levels that is less than the first range of light intensity levels, without reducing the range of light intensity levels in the image file.

US Patent:

7529004, May 5, 2009

Filed:

Jun 17, 2004

Appl. No.:

10/869990

Inventors:

Paul E. Debevec - Los Angeles CA, US
Timothy S. Hawkins - Los Angeles CA, US
Andreas Wenger - Los Angeles CA, US

Assignee:

University of Southern California - Los Angeles CA

International Classification:

H04N 1/46
G06F 15/00
G03B 9/70

US Classification:

358509, 358 19, 358514, 396166

Abstract:

A lighting reproduction apparatus for illuminating a subject includes a reproduction light optical source that generates reproduction light. The optical source includes a plurality of light emitters, each characterized by an individual color channel. There may be nine different color channels. A driver drives the light emitter color channels with intensity values at which a substantial spectral match is achieved between the reproduction light and the desired illuminant, so that the subject appears to be illuminated by the desired illuminant. These channel intensity values may be determined by solving a minimization equation that minimizes a sum of square residuals of the reproduction light spectra to the desired illuminant spectra. The output reproduction light may be metamerically, matched with the desired illuminant, with respect to a particular camera's spectral response. One or more spectral reflectances of the subject may be measured and incorporated into the optimization process.

US Patent:

7978202, Jul 12, 2011

Filed:

Dec 31, 2008

Appl. No.:

12/347782

Inventors:

Paul E. Debevec - Marina Del Rey CA, US
Timothy S. Hawkins - Marina Del Rey CA, US

Assignee:

University of Southern California - Los Angeles CA

International Classification:

G09G 5/02

US Classification:

345589, 345605, 382162

Abstract:

A high dynamic range image editing system for editing an image file having pixels spanning a first range of light intensity levels in an image editing system that only displays differences in the light intensity levels of pixels within a second range of light intensity levels that is less than the first range of light intensity levels, without reducing the range of light intensity levels in the image file.

US Patent:

8134555, Mar 13, 2012

Filed:

Apr 17, 2008

Appl. No.:

12/105141

Inventors:

Paul E. Debevec - Marina del Rey CA, US
Wan-Chun Ma - Taipei, TW
Timothy Hawkins - Marina del Rey CA, US

Assignee:

University of Southern California - Los Angeles CA

International Classification:

G06T 15/00

US Classification:

345426, 345419, 345619

Abstract:

An apparatus for generating a surface normal map of an object may include a plurality of light sources having intensities that are controllable so as to generate one or more gradient illumination patterns. The light sources are configured and arranged to illuminate the surface of the object with the gradient illumination patterns. A camera may receive light reflected from the illuminated surface of the object, and generate data representative of the reflected light. A processing system may process the data so as to estimate the surface normal map of the surface of the object. A specular normal map and a diffuse normal map of the surface of the object may be generated separately, by placing polarizers on the light sources and in front of the camera so as to illuminate the surface of the object with polarized spherical gradient illumination patterns.

US Patent:

8605108, Dec 10, 2013

Filed:

Jun 13, 2011

Appl. No.:

13/159156

Inventors:

Paul E. Debevec - Marina Del Rey CA, US
Timothy S. Hawkins - Marina Del Rey CA, US

Assignee:

University of Southern California - Los Angeles CA

International Classification:

G09G 5/02

US Classification:

345589, 345605, 382162

Abstract:

A high dynamic range image editing system for editing an image file having pixels spanning a first range of light intensity levels in an image editing system that only displays differences in the light intensity levels of pixels within a second range of light intensity levels that is less than the first range of light intensity levels, without reducing the range of light intensity levels in the image file.