hmm that flickering is much more than I received with my projector..
Which cam res do you use? What happens if you use a 2pixel wide line?(to be set in my GUI)
I did my fingerprintscan using this linescan application (with a Projection res of 1024X768) and a logitech Pro 9000 at 960x720 which gives about 15fps.
I added some lenses in front of the projector optics . You can use normal "close-up" lenses as used for photo optics (I recommend to combine a +10 and a +4 lens to get a size to scan a fingerprint)
Do you run the code via processing or do you use the exe ( I could post a exe with a smaller projection)?