I want to make a "virtual keyboard" like the type you can buy from best buy, but instead of using a laser projection of the keyboard template I want to use a micro projector to project a more realistic version of the keyboard (and other screens). See this diagram:
When put your fingers in the infrared linear laser the camera detects the light being reflected off of them. Id replace the "keyboard pattern projector" with an actual projector (with some rearranging I'm sure). Would the be able to differentiate the visible light hitting your fingers (or even before it hits your fingers) and the laser light hitting your fingers? I'd think they'd operate on different wavelengths but my physics knowledge is ̶n̶o̶n̶e̶ very limited so I'm unsure.