This paper describes optical flow-based person tracking using multiple cameras in an indoor environment. There are usually several objects in indoor environments which may obstruct a camera view. If we use only one camera, tracking may fail when the target is occluded by the objects. By using multiple cameras, this problem can be solved. In our method, each camera tracks the target person independently. By exchanging information among cameras, the three dimensional position and the velocity of the target are estimated. When a camera loses the target by occlusion, the target position and the velocity in the image are estimated using information from other cameras which are tracking the target.

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