On Aug 31, 10:36 pm, DeanB <deanbrow...@yahoo.com> wrote:
> Hello all - I am trying to work out what this means: On my internet
> camera you can trigger the camera to take pics before and after the
> trigger event. Here are the options:
>
> Image Buffer Frequency
>
> [check] Enable Pre-trigger Image Buffer
> Every N seconds, buffer B images, Total T images.
>
> [check] Enable Post-trigger Image Buffer
> Every N seconds, buffer B images, Total T images.
>
> I don't understand from the manual what the post-trigger "buffer
> images" can be. How is this field used?
Without even researching it, I'll take a stab.
Cams and Digital Video Recorders (DVR) will have a recording buffer of
say ten to thirty minutes that is constantly overwritten.
When an event is detected by a contact opening or closing, or by a
change of the pixels in a specified area of the viewed image, it will
start archiving the video from some point of the the imagery stored in
the buffer that was stored during the pre-triggered event time.
Recording imagery based on movement has the advantage of conserving
hard drive space and spending time reviewing hours of video to look
for an event.
For example, a self storage company may have a camera that points to
the front gate and the driveway off the highway (with lots of movement
from cars driving by) is still visible in the background. You would
set the detection area to look for movement at the gate and when
movement is detected, its starts storing the imagery of a car exiting
the highway and turning into the drive during the prior thirty
seconds.
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