ZoneMinder Forums

Posted: **Thu Apr 27, 2006 1:33 pm**

hi,
I need some help with the sensitivity. I have a cam in the driveway facing east. In the Afternoon, sun being from the west, i get a sun reflection from cars passing by on the road. The reflection hits the cam and triggers an alarm in the zone i am watching. What settings would be best to ignore the reflection ?

Units: Percent
Alarm Colour (Red/Green/Blue): 255/0/0
Alarm Check Method: Alarmed pixels
Min/Max Pixel Threshold (0-255): 12
Filter Width/Height (pixels): 7 x 7
Zone Area: 100
Min/Max Alarmed Area: 5 to 65
Min/Max Filtered Area: 0 to 0
Min/Max Blob Area: 0 to 0
Min/Max Blobs: 1

Posted: **Thu Apr 27, 2006 2:38 pm**

I would suggest that the first thing to look at may be the max pixel threashold. With a reflection the pixels will be much changed from their previous values so if you cap the difference at perhaps 60 or so then maybe it will help somewhat. It comes down to experimentation a bit and checking what the stats say for alarms that have already happened. Ther new version 1.22.1 keeps stats on the average pixel difference for alarmed pixels which may well help in your circumstance.

Posted: **Thu Apr 27, 2006 4:13 pm**

Refresh ShowFilterWindow Show Timeline

Id Name Monitor Cause Time Duration Frames Alarm
Frames Total
Score Avg.
Score Max.
Score
380 Event-380 Driveway Motion 04/27 11:35:45 0.00 11 1 6 6 6
381 Event-381 Driveway Motion 04/27 11:43:01 0.00 11 1 7 7 7
382 Event-382 Driveway Motion 04/27 11:50:27 0.00 11 1 8 8 8
383 Event-383 Driveway Motion 04/27 11:50:45 0.00 11 1 6 6 6
384 Event-384 Driveway Motion 04/27 11:52:23 0.41 12 2 14 7 9
385 Event-385 Driveway Motion 04/27 11:53:50 0.00 11 1 8 8 8
386 Event-386 Driveway Motion 04/27 11:55:16 0.00 11 1 6 6 6
387 Event-387 Driveway Motion 04/27 11:55:51 0.44 12 2 12 6 7
388 Event-388 Driveway Motion 04/27 11:56:01 3.33 19 9 123 13 28
389 Event-389 Driveway Motion 04/27 11:56:28 0.00 11 1 23 23 23
390 Event-390 Driveway Motion 04/27 11:56:35 0.00 11 1 12 12 12
391 Event-391 Driveway Motion 04/27 11:58:46 0.00 11 1 15 15 15
392 Event-392 Driveway Motion 04/27 12:02:40 0.00 11 1 13 13 13
393 Event-393 Driveway Motion 04/27 12:08:14 0.00 11 1 6 6 6

Posted: **Thu Apr 27, 2006 9:36 pm**

This is just the events listing. If you have ZM_RECORD_EVENT_STATS on you should gets a 'stats' link when viewing events and event images. This will have more useful information.

ZoneMinder Forums

Sun reflection

Sun reflection