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.