Today I read a paper titled “Laser Actuated Presentation System”
The abstract is:
We present here a pattern sensitive PowerPoint presentation scheme.
The presentation is actuated by simple patterns drawn on the presentation screen by a laser pointer.
A specific pattern corresponds to a particular command required to operate the presentation.
Laser spot on the screen is captured by a RGB webcam with a red filter mounted, and its location is identified at the blue layer of each captured frame by estimating the mean position of the pixels whose intensity is above a given threshold value.
Measured Reliability, Accuracy and Latency of our system are 90%, 10 pixels (in the worst case) and 38 ms respectively.