My Talk (2006/02/08)

1.Description of the calibration parameters
2.Paper:Autocalibration of a Projector-Camera System

Paper abstract:
This paper presents a method for calibrating a projector-camera system that consists of multiple projectors (or multipleposes of a single projector), a camera, and a planar screen. We consider the problem of estimating the homography between thescreen and the image plane of the camera or the screen-camera homography, in the case where there is no prior knowledge regardingthe screen surface that enables the direct computation of the homography. It is assumed that the pose of each projector is unknownwhile its internal geometry is known. Subsequently, it is shown that the screen-camera homography can be determined from only theimages projected by the projectors and then obtained by the camera, up to a transformation with four degrees of freedom. Thistransformation corresponds to arbitrariness in choosing a two-dimensional coordinate system on the screen surface and when thiscoordinate system is chosen in some manner, the screen-camera homography as well as the unknown poses of the projectors can beuniquely determined. A noniterative algorithm is presented, which computes the homography from three or more images. Severalexperimental results on synthetic as well as real images are shown to demonstrate the effectiveness of the method.

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