The larger the input camera image is, the smaller the markers can be and still be detected, and the less the JPEG artefacts will disturb the detection. Unfortunately the OpenCV cvcam interface that was used in these demos is not able to properly set the camera resolution, it usually defaults to a lower resolution such as 160x120 or 320x240.
The camera resolution should not be confused with the resolution of the graphics window, the demo program window can be 640x480 when the camera resolution is only 160x120. The picture of the background will just appear grainer and more pixelated. The system will work better if the camera can be set to a higher resolution.
Some users have found that if they run another program where you can set the camera resolution first, then it will run with a higher resolution when you run the ARTag demos. For some, the programs downloaded from http://www.shrinkwrapvb.com/ezvidcap.htm seem to do the trick on some computers.
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