Re: Linux Cash Idea - Facility Security
From: Jan Panteltje (pNaonStpealmtje_at_yahoo.com)
Date: 03/31/05
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Date: Thu, 31 Mar 2005 16:11:42 GMT
On a sunny day (31 Mar 2005 05:59:33 -0800) it happened googlemike@hotpop.com
wrote in <1112277573.107994.54260@l41g2000cwc.googlegroups.com>:
>The web cam is a great idea if you can figure out (a) how to wire it
>long distances in an environment where you may have 400 employees or
>more; (b) how to funnel the web cam output from more than one web cam
>into a single Linux PC for collection; (c) how to get Linux to read the
>video data in time slices that use less disk space, rather than the raw
>video stream, and to store it with some kind of lossy compression; (d)
>how to split this so that not only are you recording, but you're
>providing real-time screens to security personnel.
I think yo ushould forget about USB and wireless for reasons you mention.
USB is a 1 meter solution.
Use ethernet, use an embedded board with the webcam to send the data as for
example mpeg4 over ethernet cabel.
Use switches.
That said, somebody (maybe reading this?) had my old mcam up on a building
site (http://panteltje.com/panteltje/mcam/ ) with a PC in Mexico, now
remote controlled, but his PC was not that stable, but not exactly next door
either....
Somebody did a FPGA board for that webcam too as study project.
If you cannot do hardware design you will have to buy something.
>
>This is what Zoneminder can do to some degree.
>
>Now you might say, okay, go wireless, but the problem with that is that
No, not wireless.
>
>For wired video streams on ordinary web cams, the problem comes down to
>getting USB to transfer the signal far enough. I don't think ordinary
>USB can do that, so one might need to do a USB extender via CAT 5
>Ethernet. This will probably require hardware at either end of the CAT
exactly.
>5 to translate the signal back to USB. Is this possible? I don't know.
No, you could use a switch and give each camera has an IP number.
Your PC input is say 100 Mbps ethernet.
This will also facilitate soem guard at home to do checks.
You need passwords / access control (cameras should not be in any way public).
>The way my office has this wired up is that they have what looks like
>old Ethernet BNC connectors in the back of the central server. I guess
>that means coaxial.
Yuk, use RJ 45 connectors / cable, with that Ethernet cable you can use 2
wires to power the embedded board / camera! There are chips specially for
that!
>Sounds like you did some project like this a very long time ago with
>286 ASM wireless cards. I don't know what that is per se, but it would
>be great if you could share how this worked.
The wireless was some XX GHz systen where you held your ID card in front of
a sensor.
It was an US made unit, that interfaced to the PC via serial port.
All IO for controlling the building automation (doors + lights etc), I
designed and was in a large double height 19 inch rack, connected to PC via
par IO cards (say flat cable).
There were also hardware components as watchdog, audio system (announcements),
sensor for light and temperature (to control sunshades) and what not.
A calling system, a clock in every office etc etc.. all controlled from the
central PC, remote burglar alarm signalling....
Ahead of time then.
'Zoneminder' as a word I dunno.
Most of these building applications I know are custom made to specs...
- Next message: Jeff: "Porting Linux to new CPU"
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- In reply to: googlemike_at_hotpop.com: "Linux Cash Idea - Facility Security"
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