# LAG CAMERA: A MOVING MULTI-CAMERA ARRAY FOR SCENE ACQUISITION

### Daniel G. Aliaga, Yi Xu, Voicu Popescu

#### 2006

#### Abstract

Many applications, such as telepresence, virtual reality, and interactive walkthroughs, require a three-dimensional (3D) model of real-world environments. Methods, such as lightfields, geometric reconstruction and computer vision use cameras to acquire visual samples of the environment and construct a model. Unfortunately, obtaining models of real-world locations is a challenging task. In particular, important environments are often actively in use, containing moving objects, such as people entering and leaving the scene. The methods previously listed have difficulty in capturing the color and structure of the environment while in the presence of moving and temporary occluders. We describeF a class of cameras called lag cameras. The main concept is to generalize a camera to take samples over space and time. Such a camera, can easily and interactively detect moving objects while continuously moving through the environment. Moreover, since both the lag camera and occluder are moving, the scene behind the occluder is captured by the lag camera even from viewpoints where the occluder lies in between the lag camera and the hidden scene. We demonstrate an implementation of a lag camera, complete with analysis and captured environments.

#### References

- A. Agarwala, C. Zheng, C. Pal, M. Agrawala, M. Cohen, B. Curless, D. Salesin, R. Szeliski. Panoramic Video Textures. ACM Transactions on Graphics (Proceedings of SIGGRAPH 2005), pp. 821-827, 2005.
- C. Buehler, M. Bosse, L. McMillan, S. Gortler, and M. Cohen. Unstructured Lumigraph Rendering. Proc. ACM Conference on Computer Graphics (SIGGRAPH), pp. 425-432, 2001.
- J. Davis, D. Nehab, R. Ramamoorthi, and S. Rusinkiewicz, Spacetime Stereo: A Unifying Framework for Depth from Triangulation, IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. 27, No. 2, February 2005.
- S. Gortler, R. Grzeszczuk, R. Szeliski, and M. Cohen. The Lumigraph. Proc. ACM Conference on Computer Graphics (SIGGRAPH), pp. 43-54, 1996.
- M. Levoy and P. Hanrahan. Lightfield rendering. Proc. ACM Conference on Computer Graphics (SIGGRAPH), pp. 31--42, 1996.
- Y. Li, J. Sun, and H.-Y. Shum, Video Object Cut and Paste, ACM Trans. on Graphics (Proc. of SIGGRAPH 2005), pp. 595-600, 2005.
- W. Matusik and H. Pfister. 3D TV: a Scalable System for Real-time Acquisition, Transmission, and Autostereoscopic Display of Dynamic Scenes. ACM Trans. Graph. (SIGGRAPH Proceeding) 23, 3, pp. 814-824, 2004.
- T. Naemura, J. Tago, and H. Harashima. Realtime videobased modeling and rendering of 3d scenes. IEEE Computer Graphics and Applications, Vol. 22, No. 2, pp. 66-73, March/April 2002.
- A. SchÃ¶dl, R. Szeliski, D. H. Salesin, and I. Essa. Video textures. Proc. ACM Conference on Computer Graphics (SIGGRAPH), pp. 489-498, July 2000.
- R. Tsai, A Versatile Camera Calibration Technique for High-Accuracy 3D Machine Vision Metrology Using Off-the-Shelf TV Cameras and Lenses, IEEE Journal on Robotics and Automation, RA-3:4, pp. 323-344, 1987.
- H. Wang and R. Yang, Towards Space-Time Light Field Rendering, ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games (I3D), 2005.
- J. Wang, P. Bhat, A. Colburn, M. Agrawala and M. Cohen. Interactive Video Cutout. ACM Trans. on Graphics (Proc. of SIGGRAPH), pp. 585-594, 2005.
- J.C. Yang, M. Everett, C. Buehler, and L. McMillian. A Real-time Distributed Light Field Camera. Proceedings of the 13th Eurographics Workshop on Rendering, pp. 77-86, 2002.
- L. Zhang, B. Curless, and S. Seitz, Spacetime Stereo: Shape Recovery for Dynamic Scenes, IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR 7803), Volume 2, pp. 367-374, 2003.

#### Paper Citation

#### in Harvard Style

G. Aliaga D., Xu Y. and Popescu V. (2006). **LAG CAMERA: A MOVING MULTI-CAMERA ARRAY FOR SCENE ACQUISITION** . In *Proceedings of the First International Conference on Computer Graphics Theory and Applications - Volume 1: GRAPP,* ISBN 972-8865-39-2, pages 98-107. DOI: 10.5220/0001356300980107

#### in Bibtex Style

@conference{grapp06,

author={Daniel G. Aliaga and Yi Xu and Voicu Popescu},

title={LAG CAMERA: A MOVING MULTI-CAMERA ARRAY FOR SCENE ACQUISITION},

booktitle={Proceedings of the First International Conference on Computer Graphics Theory and Applications - Volume 1: GRAPP,},

year={2006},

pages={98-107},

publisher={SciTePress},

organization={INSTICC},

doi={10.5220/0001356300980107},

isbn={972-8865-39-2},

}

#### in EndNote Style

TY - CONF

JO - Proceedings of the First International Conference on Computer Graphics Theory and Applications - Volume 1: GRAPP,

TI - LAG CAMERA: A MOVING MULTI-CAMERA ARRAY FOR SCENE ACQUISITION

SN - 972-8865-39-2

AU - G. Aliaga D.

AU - Xu Y.

AU - Popescu V.

PY - 2006

SP - 98

EP - 107

DO - 10.5220/0001356300980107