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Journal of Information Science and Engineering, Vol. 26 No. 5, pp. 1637-1655 (September 2010)

Low-Cost Smart Projector for Home Entertainment*

WUN-YI LEE AND TSORNG-LIN CHIA
Department of Computer and Communication Engineering
Ming Chuan University
Taoyuan, 333 Taiwan

A projector can support a large-screen display at a lower cost than a television which is currently the most useful home entertainment device. Because most families live in small spaces, they cannot easily make full use of the benefits of projectors. This work solves the problem of projecting the largest possible display image in a small space, without limiting the projective distance or area. A camera connected with the projector is adopted to capture information about the screen surface and environment. Plane homographies are then used to correct distortions of the input image caused the projection surface. The display image then seems to be displayed on a virtual screen toward the viewer. The proposed method solves of skewed display image caused by oblique projections. The experimental results demonstrate that the proposed system can change the display environment for home entertainment.

Keywords: plane homography, smart projector, projective geometry, image warping, multiple-plane projection

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Received September 30, 2008; revised February 4, 2009; accepted April 16, 2009.
Communicated by Tyng-Luh Liu.
* This paper was partially supported by the National Science Council of Taiwan, R.O.C., under Grant No. NSC 96-2221-E-130-016-MY2.