*********** *** ****** ********** ** ****** using **** ***, **** **** * few ******** **** *********** *** ***********:

Multiple ***** ********* *******
*** **** ****** *********** *********** **** was************* ******* ******* ** ****. ****'* some ****** ********:
- "** ********* ******* *-* ********* ******* in ***** ** *** ***"
- "**** ** *** *** ****** ******* more ***** **** ** ******* ******* of ***."
- "**** ********* **** ********* ******* ******** fixed ******* **** ***** ***"
- "** ** *** ** ******* *** PTZs, **** ** **** ***** ** no ***** ** ********** ****. ********** when *** *** ******* *-* ***** cameras *** *** ***** ** *** one ***."
- "** **** **** *** *** ******* install **** ***** **** ** ***** if *** *** *** **** **** POVs ** **** ***. *** **** premium **** * *** **** ***'* logical."
- "********* ****** **** ********** *** ********* *** **** ** *-* *****."
********** **** *** ******* ** ***** MP *******, *** *** ****** *** 3 ** **** * ***** ******* for *** ***** ** * ****** PTZ. ****, **** ********* *** ***** ******, the ******** **** ** * ********** fixed ******* ** *** ******* **** the *********** ** / ****** ************.
** ******, *** ***** ***** ******* is **** ***** ***** ******* ****** their ****** *** ************ ***** * moving *** **** ******** ***** ** is ***** ** *** ***** ****.
** *** **** ****, *********** ********* ******* replacing * ****** *** **** * single ** ***** ******, ** * fixed **** *** ****** *** ****** capture *** ******* **** **** ** meters away (*.*., * ***** ****** **** an ** *** ******** ***** **** up ** ** **** **** **** the ******).
********, *********** *** ***** *** * key ***** ***** **** *** ***** valuable:
Large *****
**** *********** ********** *** **** *** PTZ, *** *** ************* *********** ** even ** ***** *******, **** ******** large *****:
- "**'** *** * *** ************** ** schools **** ** ** **** ** pan *** **** ****** ** *** very ***** ***** ** ** * 270deg ***."
- "******* ******** *** ******* ***** ***** user ***** ** ** **** ** view ****** ****."
- "*********, ** *** **** ******* *** to ***** ***** ***** ** *** away *********, **** ** ******* ****."
- "***** ***** ***** * **** **** detail ** *** **** ** *** large, *** ********* ** ********** ******** with ***** *******. ********** ** ********** Station *********."
*** ********, **** ** *** *** (3) *** ******* **** ** **** covering ****** ** ****** **** ****, you ***** **** ***** ~** ***** distance **** *****. ** ********, *** users ********* ***** **** ***+ ****** away **** * ******.
Live *********
** *** **** ****, ********** ***** integrator ********** ***, **** **** ***** areas, ***** ***** **** ** **** dedicated ********* ** **** *** *** of ****:
- "** ***'* ********* **** ** ******* end-users ** **** ***'* **** ** operator ** ******** **** *** ****** around."
- "*** *** ********* *** ** *** work ****** **** ** ********** ***** cameras *** **** ******* ********* **** 24/7."
- "**** ***** ***** ** * ***** station **** ** ******* **/*."
- "****** **** *** **** ** *** site *** * ******* **** **** manned *********"
- "*** *** ******* *** **** ********* only ** ******* ** **** ** manipulate ****."
- "** *** ****** **** ****** *** manned ******* ** * **** ** access ****** *** ******."
- "**** ** *** ******* ** *** have ********* ********* ** ******* * PTZ ***********."
************/ *******
****** **** ********* ******* *** *** cases **** ******** *******, ******* ****, airports, ********, ***., *** **** ****** use **** *** ********* **********:
- "***** *** ********* ********* ******** ** construction ***** ***** *** ** ***** to *** *** *** ******* ** progressing *** ** **** ** *** on **** *** *********."
- "*** **** ** **** ****** ** construction ***** ** ******* ******** *** safety *******."
- "** *** *** ************ ***** *** time ***** ********."
- "** **** **** **** *** ****** owners **** ** ******* **** ** have **** ** **** * ******** PTZ. **** *** **** ** **** at *** ***** ** *********/****** ***** ***** *****."
********
******** ** **** *** **********, **** estimates **** *** ***** ** **** from ~**% ** *** ******* ** ~10. **** ** * *********** ** more ***** ******* ***** **** ***********.
** ******** ** *** ********* ** fixed *********, * *** *********** ***** that ***** ******** ** ************ ********** has **** **** *** ***:
- "**** *** ******** **** *** ***** as ********* *** *** ***** *** the ******* ******* ************ ****** *** **** ****."
- "**** ****** *** **** *** ****. Not * **** ****** ****."
*******
***** ** ****** ********* ******* *** *** decline, ********** ** ** *** *** PTZs ***** ********** **** ******. ********* resolution ****** ** ******* *** ** would **** ***+ ** ********** ******* to ********* ********* *** *** ********** large ***** **** **** *********.
Comments (38)
Carl Lindgren
John,
You didn't mention casinos - one of the largest users of PTZs. We use them to zoom in on areas that are also covered by fixed cameras. Also, outdoors where it would take a much larger number of fixed cameras to cover the same area. In fact, approximately 15% of our cameras are PTZs.
Of course, casino systems are usually manned 24/7.
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Michael Peele
I am not a fan of PTZ for anything other than active monitoring, and even then, they can be an issue.
(External to casinos...)
For non-active monitoring, PTZ cameras are often not pointed in the direction needed, and/or if they have an automated path, may not stay on target long enough.
They also seem to be less reliable than fixed cameras. I have several old PTZ cameras that no longer P, T, or Z, but otherwise work.
I believe that most cameras are installed somewhere where the video will never be looked at...
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Jeffrey Hinckley
For the first time in many years, I am starting to sell and install more PTZ cameras.
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Jim Elder
PTZs make a guards time on the console more interesting. Operators could conduct active "video patrol tours" to ensure the operator is alert and of course, make sure the masking is turned on where private spaces are involved.
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Claudio Almeida
John,
You wrote: "Megapixel resolution growth is slowing and it would take 100+ MP resolution cameras to seriously challenge PTZ use monitoring large areas with live operators."
I totally agree and I've maid this calculation: It will be needed at least a 423 Megapixels camera to replace a VGA PTZ with a 35 X optical zoom.
You can check how I've got this number here: http://www.cctvinstitute.com.br/megapixel-or-speed-dome.html
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Horace Lasell
IPVM is really great because there's always so much to learn here :)
I followed the definition of zoom as a ratio of focal lengths, at min and max zoom.
I also followed the cctvinstitute analysis which implies that a ratio of focal lengths should equate to a ratio of linear distance between a pair of pixels, at min and max zoom.
After independently replicating Claudio's analysis (you know, "as an exercise for the student" :), it seemed to me that both definitions are right. So, am I missing something?
Thanks!
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Claudio Almeida
Yes, both are right, Horace
But, depending on who is reading, one can be easier to understand than the other...
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