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A camera fixed to the ceiling watches the activity on the board. It is connected to a computer which uses low-resolution images to detect when the user has stepped aside and so is not obscuring the board. The system then captures a high resolution image, thresholds it, and attempts to recognise the marks that are in the image.
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Details of the marks found, their position, and their type if recognised, are passed to a Prolog engine which can analyse the relationships between them and so determine if the combination of symbols required to constitute, say, a 'Print' command are present on the board. Appropriate actions can then be taken.
There's a two-minute video clip of BrightBoard in use which you can view if you have a recent QuickTime player.
