Dynamic shadow removal from front projection displays

Details Dynamic shadow removal from front projection displays Dynamic shadow removal from front projection displays

2006-11-07

2006-11-07

Kostak, Victor R. (Department: 2622)

Television

Video display

Projection device

C348S189000, C353S094000

Reexamination Certificate

active

07133083

ABSTRACT:
A technique and system for detecting a radiometric variation/artifacts of a front-projected dynamic display region under observation by at least one camera. The display is comprised of one or more images projected from one or more of a plurality of projectors; the system is preferably calibrated by using a projective relationship. A predicted image of the display region by the camera is constructed using frame-buffer information from each projector contributing to the display, which has been geometrically transformed for the camera and its relative image intensity adjusted. A detectable difference between a predicted image and the display region under observation causes corrective adjustment of the image being projected from at least one projector. The corrective adjustment may be achieved by way of pixel-wise approach (an alpha-mask is constructed from delta pixels/images), or bounding region approach (difference/bounding region is sized to include the area of the display affected by the radiometric variation). Also: a technique, or method, for detecting a radiometric variation of a display region under observation, as well as associated computer executable program code on a computer readable storage medium, therefor.

REFERENCES:
patent: 5506597 (1996-04-01), Thompson et al.
patent: 5871266 (1999-02-01), Negishi et al.
patent: 5923381 (1999-07-01), Demay et al.
patent: 6115022 (2000-09-01), Mayer et al.
patent: 6310650 (2001-10-01), Johnson et al.
patent: 6361438 (2002-03-01), Morihira
patent: 6377269 (2002-04-01), Kay et al.
patent: 6377277 (2002-04-01), Yamamoto
patent: 6456339 (2002-09-01), Surati et al.
patent: 6469710 (2002-10-01), Shum et al.
patent: 6512507 (2003-01-01), Furihata et al.
patent: 6554431 (2003-04-01), Binsted et al.
patent: 6570623 (2003-05-01), Li et al.
patent: 6611241 (2003-08-01), Firester et al.
patent: 6733138 (2004-05-01), Raskar
patent: 2002/0164074 (2002-11-01), Matsugu et al.
patent: 2003/0085867 (2003-05-01), Grabert
Han Chen, R. Sukthankar, G. Wallace, and Tat-Jen Cham, “Calibrating Scalable Multi-Projector Displays Using Camera Homography Trees.” Included here by way of background, only; noting that a corresponding citation of this group was made to [1] Technical Report TR-639-01, Princeton University, dated Sep. 2001; this document was available on-line for viewing on Dec. 4, 2001 and printed on that date. This document identified Attachment D of prov. app.
R. Sukthankar, Tat-Jen Cham, and G. Sukthankar, “Dynamic Shadow Elimination for Multi-Projector Displays,”on-lineCompaq Tech Report CRL Apr. 2001 document dated Jun. 2001.
C. Jaynes, S. Webb, and R. Matt Steele, “Dynamic Shadow Removal from Front Projection Displays.” Abstract from 12thIEEE Visualization 2001 Conference, VIS 2001, San Diego, CA , Oct. 24-26, 2001. Included here by way of background, only, as it is authored by applicants; noting that conference dates are within 1-year prior to provisional app. filing date.
R. Sukthankar, Tat-Jen Cham, and G. Sukthankar, “Dynamic Shadow Elimination for Multi-Projector Displays.” vol. 2, Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, CVPR, Kauai, Hawai'I, Dec. 8-14, 2001. Included here by way of background, only; noting that conference took place after provisional app. filing date granted, although document was available on-line for viewing on Dec. 4, 2001.
R. Samanta, J. Zheng, T. Funkhouser, K. Li and J. Pal Singh, “Load Balancing for Multi-Projector Rendering Systems.” Included here by way of background, only; noting that this document was available on-line for viewing on Dec. 4, 2001 and printed on that date from: http://citeseer.nj.nec.com/update/201288 (listed on cover page).
R. Samanta, and T. Funkhouser, “Dynamic Algorithms for Sorting Primitives Among Screen-Space Tiles in a Parallel Rendering System.” Included here by way of background, only; noting that this document was available on-line for viewing on Dec. 4, 2001 and printed on that date from: http://citeseer.nj.nec.com/.

Affiliated with

Also associated with

Rating

Dynamic shadow removal from front projection displays does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dynamic shadow removal from front projection displays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic shadow removal from front projection displays will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3700379