On Wed, 25 Aug 1999 18:42:01 -0400, Andy Kunz wrote:

>>How do you know that the CCD is seeing a laser dot and not some other bright
>>dot of light?
>
>With a CCD, you can measure the dot.  If it's not the size of the laser
>(within reason), you got the wrong dot.  Also, the color would be a good clue.
>

Not to mention that you can turn the laser off, take a frame, and if the
dot is still there, it wasn't the laser.  Actually, you could just take
two frames. One with lasers on and the other with lasers off.  Subtract
them.  What's left are only the laser dots and some noise, which could be
easily filtered.  Motion in the video between frames might be
a bit more work to deal with, but you can still use the afformentioned
techniques to filter it even further.

Learned this from a fellow at our local robotics club.

Dan