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A multi-touch platform based on four corner cameras and methods for accurately locating contact points

机译：基于四个角相机的多点触摸平台以及精确定位接触点的方法

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摘要

This paper presents a low-cost and scalable multi-touch platform which uses four cameras to reduce occlusion. Three methods are provided for locating contact points on this platform, including the lookup table, vanishing point, and 3D reconstruction. With each of these methods, respectively, the contact point is located using the projection center and the reference point, the projection center and the vanishing point, and the back-projected rays of epipolar geometry. If the four directing lines of a contact point intersect, the contact point is considered to be real; if the lines do not intersect, the point is rejected. Experimental results indicate that all three methods are capable of locating contact points even under conditions of occlusion. The lookup table and vanishing point methods are, respectively, best suited to small and large platforms, while the accuracy of 3D reconstruction method has been found to be sensitive to the physical setup. The approach proposed here can be directly installed on existing display platforms and thus should be of practical applicability in the near future.
机译：本文提出了一种低成本且可扩展的多点触摸平台，该平台使用四个摄像头来减少遮挡。提供了三种在此平台上定位接触点的方法，包括查找表，消失点和3D重建。分别使用这些方法中的每一个，都使用投影中心和参考点，投影中心和消失点以及对极几何体的反投影射线来定位接触点。如果接触点的四条直线相交，则认为该接触点是真实的；如果线不相交，则该点被拒绝。实验结果表明，即使在遮挡条件下，这三种方法也都能够定位接触点。查找表和消失点方法分别最适合小型平台和大型平台，而3D重建方法的精度已发现对物理设置敏感。这里提出的方法可以直接安装在现有的显示平台上，因此在不久的将来应具有实用性。

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