四路摄像头分组重建的多触点定位方法

针对多重触控技术中的多触点遮挡难题，该文提出一种基于4路摄像头协同的多触点定位方法。该方法利用矩形交互区4顶点处的4路摄像头同步获取交互区图像，检测目标触点，根据立体视觉中的极线约束和3维重建原理，将4路摄像头分组进行标定和3维重建，得到4条代表触点方向的直线，最后利用双阈值拟合4条直线交点定位出触点位置。实验证明该方法能有效解决多触点遮挡问题，可支持任意多个触点的精确定位，且成本低廉，便于安装和移植。

Multi-touch Locating Method Based on Reconstruction of Four Cameras in Groups

To solve the occlusion of multi touch, this paper presents a multi-touch locating method based on the collaboration of four cameras. It uses four cameras fixed at each corner of the frame to capture images synchronously, detects objects in each camera, builds lines directing the object according to epipolar geometry and 3D reconstruction, and finally calibrated with the four cameras to locate each object. The experiment result shows that this method can locate multi touch precisely even under occlusion and it is low cost, easy to install and transplant.