Dynamic shadow removal from front projection displays

Jaynes,; Webb,; Steele,; Brown,; Seales,

doi:10.1109/visual.2001.964509

Cited by 38 publications

(35 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The problem of existence of multiple light sources is considered in the literature [14,15,16], but there was not any solution that could be applied independently of number of light sources, or could be efficient and cheap at the same time. Also, the possibility of moving the light sources was not considered.…”

Section: Related Workmentioning

confidence: 99%

Real-time shadows in OpenGL caused by the presence of multiple light sources

et al. 2017

View full text Add to dashboard Cite

Preliminary communicationIn modern computer graphics, the emphasis is on the details of the scene, and taking into account the improvements in hardware performances, it is not allowed to make compromises when it comes to the reality of scenes. Each reflection, shadow, rounded corner and transparency must be brought to perfection and presented in order to make a depicted scene more realistic. In one of the most widely used API for rendering 3D objects, OpenGL, there is nothing similar to a library for adding those phenomena that exist in reality. If the possibility of existence of multiple light sources is considered, rendering all these details becomes a real challenge. The aim of this paper is to provide a method for generating shadows in an efficient way, for the objects commonly used as components of complex 3D objects, in conditions of the presence of moving light sources. Keywords Sjene u realnom vremenu u OpenGL-u uzrokovane prisutnošću više izvora svjetlostiPrethodno priopćenje U suvremenoj računalnoj grafici naglasak je na detaljima prizora, a uzimajući u obzir poboljšanja hardverskih svojstava, nije dopušteno raditi kompromise kada je riječ o stvarnosti scena. Svaki odraz, sjena, zaobljeni kut ili prozirnost mora biti doveden do savršenstva i prikazan u cilju da se scena koja se oslikava učini što realističnijom. U jednom od najšire rabljenih API-ja za renderiranje 3D objekata, OpenGL-u, ne postoji nešto poput knjižnice za dodavanje ovih pojava koje postoje u stvarnosti. Ako se razmatra mogućnost postojanja više izvora svjetlosti, renderiranje svih ovih detalja postaje pravi izazov. Cilj ovog rada je obezbjeđivanje metoda za generiranje sjene na efikasan način, za objekte često rabljene kao komponente složenih 3D objekata, u uvjetima prisutnosti više svjetlosnih izvora s mogućnošću kretanja.

show abstract

Section: Related Workmentioning

confidence: 99%

Real-time shadows in OpenGL caused by the presence of multiple light sources

et al. 2017

View full text Add to dashboard Cite

show abstract

“…In order to compute the color transfer function between the projector and the camera a technique described in [11] is used. Essentially this involves projecting uniform color images of increasing intensity and observing the corresponding intensity in the corresponding observed image.…”

Section: System Calibrationmentioning

confidence: 99%

The Smart Bookshelf: A Study of Camera Projector Scene Augmentation of an Everyday Environment

Crasto

Kale

Jaynes

2005

2005 Seventh IEEE Workshops on Applications of Computer Vision (WACV/MOTION'05) - Volume 1

Self Cite

View full text Add to dashboard Cite

Recent research in projector-camera systems has overcome many of the obstacles to deploying and using intelligent displays for a wide range of applications. In parallel with these developments, projector costs continue to decline with corresponding increase in resolution, brightness and contrast ratio. In light of this trend, we are exploring the unique capabilities that camera-projector systems can offer to intelligent environments and ubiqutous computing.Our initial step towards environments that are intelligently augmented by projector-camera devices, is a smart bookshelf application. The system utilizes a camera pair and a projector to monitor the state of a real world library shelf. As books are added to the shelf a foreground detection algorithm which takes into account the projected information yields new pixels in each view that are then verfied using a planar parallax constraint across both cameras to yield the book spine. Using a simple calibration scheme, the homography induced by the world plane in which book spines approximately lie is estimated. Users are then able to query for the presence of a book through a user interface and book spines are highlighted by transforming image pixels to their corresponding points in the projector's frame via the known homography. The system also can display the state of the bookshelf at any time in the past. Projected information can also be used to enhance the image-processing tasks at hand and we briefly explore this in this work.

show abstract

“…The earlier system described in [11], as well as the related approach of [5], can compensate for shadows but is incapable of suppressing projected light falling on the occluder. Shadow compensation does not require the ability to distinguish between the contributions of individual projectors.…”

Section: Iterative Photometric Compensationmentioning

confidence: 99%

“…Two previous papers [11,5] presented solutions to the shadow elimination problem for forward-projection systems. However, we are not aware of any work on the problem of occluder light suppression.…”

Section: Related Workmentioning

confidence: 99%

See 1 more Smart Citation

Shadow elimination and occluder light suppression for multi-projector displays

Cham

Rehg

Sukthankar

et al.

2003 IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 2003. Proceedings.

View full text Add to dashboard Cite

The Cambridge Research Laboratory was founded in 1987 to advance the state of the art in both core computing and human-computer interaction, and to use the knowledge so gained to support the Company's corporate objectives. We believe this is best accomplished through interconnected pursuits in technology creation, advanced systems engineering, and business development. We are actively investigating scalable computing; mobile computing; vision-based human and scene sensing; speech interaction; computer-animated synthetic persona; intelligent information appliances; and the capture, coding, storage, indexing, retrieval, decoding, and rendering of multimedia data. March 2002Abstract Two related problems of front projection displays which occur when users obscure a projector are: (i) undesirable shadows cast on the display by the users, and (ii) projected light falling on and distracting the users. This paper provides a computational framework for solving these two problems using multiple overlapping projectors and cameras. The overlapping projectors are automatically aligned to display the same dekeystoned image. The system detects when and where shadows are cast by occluders and is able to determine the pixels which are occluded in different projectors. Through a feedback control loop, the contributions of unoccluded pixels from other projectors are boosted in the shadowed regions, thereby eliminating the shadows. In addition, pixels which are being occluded are blanked, thereby preventing the projected light from falling on a user when they occlude the display. This can be accomplished even when the occluders are not visible to the camera. The paper presents results from a number of experiments demonstrating that the system converges with low steady-state errors.

show abstract

Dynamic shadow removal from front projection displays

Abstract: Foundatlon, Lexlngton, KY (Us) 2001; this document Was available on-line for viewing on Dec. 4, 2001 and printed on that date. This document identi?ed Attachment (*) Notice: Subject to any disclaimer, the term of this D of prov. app. patent is extended or adjusted under 35 C .

Cited by 38 publications

References 11 publications

Real-time shadows in OpenGL caused by the presence of multiple light sources

Real-time shadows in OpenGL caused by the presence of multiple light sources

The Smart Bookshelf: A Study of Camera Projector Scene Augmentation of an Everyday Environment

Shadow elimination and occluder light suppression for multi-projector displays

Contact Info

Product

Resources

About