Re: CCTV/PC's

[James Derrick <james@xxxxxxx>]

On Thu, 17 Feb 2000 01:49:27 -0800, you wrote:

>Has anybody got any experience of using a PC to record/view the output
>of a CCTV camera that has been triggered by movements outside ?
I capture stills from a WinTV card using Linux to form a time lapse
view of the house being built next to my garden.

The plan is to add a cheap alarm PIR to trigger video to be recorded
as well a turn on a floodlight at night.=20

I have seen a similar idea as a kit for use with a normal video for
about =A3160 (www.Screwfix.com). This has a floodlight, PIR and camera
in one unit and a pseudo-remote control to turn the video on. This
could be modified for the PC, with the advantage of a neat external
unit already waterproofed.

ATM do a clever add on for their PC based video capture card that
connects to 4 cameras, 4 PIRs and relay outputs. The spec looks rather
useful, but it is about =A3200. Maplin have it as TV51F "ATM MovieStar
Security Patch Panel". URL anyone?

It's possible to down sample video images and compare frames to detect
movement directly. My MEng was in image processing so I have books on
this in the loft, but no time to start messing about with 3x3 mask
functions!=20

I vaguely remember a chip camera for the BBC Model B that could do
this- the Beasty perhaps? Anyone still got copies of Acorn User with a
type-in listing of such software ;-)

James
---
James Derrick    james@xxxxxxx, Cramlington, Near Newcastle, Eng=
land
Forwarding Service: jderrick@xxxxxxx
Beyond the Horizon of the place we lived when we were youn=
g,
In a World of Magnets and Miracles. Pink Floyd.

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