Who Can Track An Individual Across Multiple Cameras?

Often people ask about tracking a person across a large area, including handing off to multiple PTZ cameras. What manufacturers claim to do so? Anyone have any experience with how well it works in the field? How expensive it is?

Btw, I fully understand that lots of manufacturers claim / offer autotracking on a single PTZ. Do not recommend them. I am specifically asking about a solution that tracks across Camera 1 and then programs / 'tells' Camera 2 to take over and continue tracking and then on the Camera 3, etc.

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**** ***** ***** ***** ***** ******* ***** ********* ** *******.

**** ***** **** **********.

* **** *** ********** *** **** ******** ***** ******* **** to * ****** ***. *'* ****** **** ******* *** ** well.

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**** ******* **** ** *** ******* *****. *** ******** ****** implied ** ****** ** ****** * ****** ********** ****** ******* PTZ *******. ******* ********** *** ******* *** *** ******* ** uniquely ******** * ******, ******** ** **** **** *** **** person (** *** *******) ** ***** ****.