a fiducial marker system using digital techniques

In order to embed more information into the marker, people have utilized QR codes as fiducial markers. The disadvantage is that the participant must be able to connect to a network to use the system. There are other potential advantages of a server-based system noted in the text. In this example, in the interest of portability, the participant is using a handheld device to interact with the system, but is taking advantage of the greater computational power and storage of a remote server. A server-based AR system offloads some of the burden of an AR system to a server that may be located remotely from the participant and connected via a wired or wireless network. The landmarks can be natural features in the environment or can be placed artificially into the environment.įigure 2.6.

Thus, there must be cues in the environment that the camera can use as landmarks to aid in determining location and orientation with respect to those landmarks. In order to carry out computer vision, software is needed to analyze the images collected by the camera in order to determine what the camera “sees.” Based on that information the software calculates where the camera must be in order to see that view. The camera “sees” the real world and, based on what it “sees,” can determine where it (the camera) is located and how it is oriented with respect to the scene. In order to enable computer vision, the sensor required is a camera. Hence, even if the table moves, the vase stays in its own location in the world. It has a specific place in X, Y, and Z locations that is independent of the location of anything else. The bottom view shows the vase registered absolutely in the real world. Consequently, if the table moves, the vase moves with the table. In this diagram, the top view shows the vase registered with respect to the table. If it is registered relatively, it is registered with respect to some other object. An object can be registered in an absolute position in the real world or registered relatively.

A fiducial marker system using digital techniques