Crave privacy? New tech knocks out digital cameras

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Give it a rest and try working your brain

The use of digital or film jamming technology will not jeapordize our borders. First, if a security guy or even a program is monitoring the video feeds, the jammed image is very easily recognized (a very simple algorithm just looking at the image histogram could do it) and can be used to trigger the very security response that the "bad guy" hopes to avoid. It's like sending up a flair and saying "here I am."

Secondly, it's very easy to frustrate the IR return which actually comes from the window over the CCD chip. Silicon CCDs are sensitive to all of the Near Infa-Red (NIR) spectral range in addition to the visible. A glass filter with a coating that reflects the NIR is used to suppress the invisible light and achieve good color balance. The "Nightshot" option is just a mechanical device that removes this filter from the light path (Note that the GT guys are using a Sony HandyCam with a Nightshot capability to find the cameras). Removing the IR filter removes the optical return needed to find the camera. Most surveilance camera (especially those in low light conditions) have no NIR filter already. Thus those camera will be very difficult to find.

You sound like Henny Penny with "the sky is falling" and doom and gloom. Try understanding the technology and how things really work before sounding the alarm and looking "stupid," to quote your own self.

Posted by: jacarter3   Posted on: 09/19/05 You are currently: a Guest | Members login | Terms of Use

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