On Thu, 16 Apr 2015 20:21:55 -0700 (PDT),
wrote:

A friend of mine has a neighbor who has stuck a small video camera in his bedroom window to spy on the friend's yard. The problem is in clear view of the camera is the friend's 14 year old daughter's bedroom window. The neighbor claims that the friend is running an illegal business out of his home and the camera is there to try to catch him at it. My friend hasn't tried to get the state police involved yet but the local town cops won't do anything about it.

Anyway I had an idea. I keep a small B&W TV camera in the shop connected to a monitor which I use to check IR remote transmitters. When I hold a suspect remote a few feet from the camera and operate it the camera is essentially "blinded" by the otherwise invisible infrared pulse train. Can something like this be done cost effectively but naturally on a much larger scale to blind Bozo's camera? My friend got ****ed off one night and sat there with a laser pointer directed at this camera for a couple of hours. Although it didn't resolve the problem, it did bring the cops down to advise my friend that he couldn't do that without violating the neighbors privacy! Makes you question the definition of "freedom". The distance looks to be about 200 feet. Thanks, Lenny.

Many of these cameras are VGA resolution (640x480) so the main worry
about the daughter's bedroom window at 200 feet is unlikely to be a
problem. During the day, nothing will be visible through the window
due to how much brighter it is outside. At night, even if she leaves
her curtains open and has the lights on, only a few pixels will
include the window - assuming the camera is 200 feet away and is one
of the common little cameras. (Of course, if the guy is a pervert and
is using a telescopic lens with a high res camera, call the police!)

Back to the original question, most of the newer cameras have an IR
filter to keep daytime IR light from fuzzing up the picture. If the
camera has nighttime IR illumination, then that filter is turned off
at night so your IR scheme would work at night.