Page 32 - Security Today, March 2017

“With new federal regulation it is of utmost important for campus police and security departments to be able to monitor and record crime events in real time, and to retrieve the footage for re- view. Having clear video is the first step
in creating a departmental memory which can serve as a foundation for compliance. As camera resolutions sky rocket with the advent of 4K resolution, 360-de- gree cameras, and high-power laser PTZ systems, the ability to capture and record criminal acts becomes a daily part of tracking and recording events.”
—Matt Sailor is the CEO of IC Realtime.
Professional Photography Lenses in Video Surveillance
Designed for sport and bird photography the newest professional lens- es integrate high resolution and long zoom with excellent light sensi-
tivity. When used with a state-of-the-art DSLR they can easily outper- form most traditional security cameras for long-distance targets. This opens up surveillance opportunities that we’ve not seen before.
Like PTZ cameras, most modern DSLR lenses come with a mo- torized focus feature that automatically selects the best focus. But DSLR lenses need to set focus much more accurately than lower reso- lution camera lenses. And there are a few caveats. Though they can be mounted on large pan/tilt heads the autofocus needs to be started manually. It’s also important to avoid continuous operator use to avoid motor wear out. Furthermore, image stabilization is available in many lenses.
The advantage of longer DSLR lenses is that they provide a very different perspective from a wide angle lens mounted close to the tar- get. Even if both lenses perfectly capture the target and fill the whole image area the amount of captured background will differ greatly and affect how the image is perceived.
The Eyes Have It
Pairing the right lens with the right camera begins with establishing a goal. What do you want to monitor? What field of view do you want to establish? How much detail do you need to capture? What envi- ronmental challenges do you need to overcome?
Once you know the particulars, it’s a matter of selecting the best camera and lens for the job. Be sure to examine their strengths and limitations with respect to your goals. Surveillance, after all, is a matter of keeping your eyes on the prize.
Fredrik Nilsson is the vice president, Americas, at Axis Communications, Inc.
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