Vision-based Presentation Control

Vision-based Presentation Control is another small application for smart camera - projector systems.

Vision-based presentation control frees the speaker from standing beside the computer while delivering a talk. The speaker uses a pointing device (typically a laser pointer) to activate virtual buttons on the projected slide to drive the presentation.

This one actually uses the same concept being used by the keystone correction that I talked about in my earlier post. In fact, its much simpler. Just detect the position of the laser pointer in the camera Image CamImg and map it to the original image OrgImg using the inverse of transformation T (discussed in my earlier post). Thats it. Once you know the position of laser pointer in the original image, check if its on some button or not and do appropriate actions. The vision part is this much only. Rest is software, provide different kind of buttons and all.
The author of the paper from where I read this has provided a few extra buttons that makes it easier to go to next and previous slide.