This paper describes a novel method for measuring the position and orientation of physical tags on a large tabletop display. This method employs a set of photo sensors and accelerometers embedded in a tag to observe fiducial marker patterns shown on the display and to predict the incoming position/orientation of the tag. In this paper, we especially propose a new fiducial marker pattern that is more robust in terms of ambient light, the unevenness of display luminance, and the measurement range than the one previously proposed. The new pattern also makes the physical tags smaller and less obtrusive. We finally show the results of several preliminary experiments that we conducted for each sensor device.
