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Author Topic: PIR Too Many False Positives  (Read 13028 times)

JDAM

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PIR Too Many False Positives
« on: July 30, 2013, 07:11:49 AM »

Is there any way to adjust the PIR sensors sensitivity on the DCS-2332L?
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rstark18

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Re: PIR Too Many False Positives
« Reply #1 on: December 08, 2013, 03:48:58 PM »

Is there?
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rstark18

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Re: PIR Too Many False Positives
« Reply #2 on: December 11, 2013, 10:26:37 AM »

I tried out PIR for a day and it just wasn't working out. Too bad. I have gone back to motion detection and found a setting that seems to work pretty good. I'm using Sensitivity 40 and Percentage 15 but I only have half the image area detected because of some xmas lights I have up right now. As soon as the holidays are over and I can detect the image are then I might bump the Percentage up a little.
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rstark18

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Re: PIR Too Many False Positives
« Reply #3 on: January 09, 2014, 06:47:19 PM »

Now that the christmas lights are down I decided to try PIR again. So far so good. All day without any false positives. With my previous motion detect settings I would get a few false positives a day. This would happen when there was a color or tone shift in the camera. It was slightly annoying but I could deal with it.
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cmontyburns

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Re: PIR Too Many False Positives
« Reply #4 on: June 12, 2014, 08:27:05 PM »

BUMP!

I've been experimenting with the PIR sensor on my 2332L's.  It's amazing how variable it is, depending on location.  (Or maybe it depends on the camera?)  One of my cameras, which looks at my back yard, is spot-on perfect with PIR sensing.  Almost no false positives -- maybe a few each day; no big deal -- and catches human movement everywhere in the field of view quite reliably, day or night.   

A second camera, which watches a side gate to my yard, varies between being under sensitive -- it almost never sees me if I walk into the field after dark -- and over, with a few false positives each hour.  Still usable overall, but barely.

And a third, which watches my front yard, basically senses motion constantly through the day, and maybe for 20 minutes each hour after dark.  To be fair, there is more motion in this field generally than for the other two, with flowers and shrubs waving in the breeze, and shadows on the lawn.  But nothing where the IR field should change.  Too, the other two cameras both have those things at least somewhat, and handle them much better.  This one is useless for motion sensing via the PIR.

(I'm trying out a new 2330L in a different location, and it behaves much like that third camera -- basically thinks it sees motion every minute during the day.)

It's unfortunate the results vary so much.
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rstark18

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Re: PIR Too Many False Positives
« Reply #5 on: June 17, 2014, 04:08:53 AM »

Does your cams that are giving you false positives pointed toward any light sources? I had issues with PIR when I first got mine because of my swaying Xmas lights.
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cmontyburns

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Re: PIR Too Many False Positives
« Reply #6 on: June 17, 2014, 02:48:46 PM »

Does your cams that are giving you false positives pointed toward any light sources? I had issues with PIR when I first got mine because of my swaying Xmas lights.

Not man-made light sources, no.  The one that is particularly useless for PIR sensing probably sees more sunlight on the ground than the other ones do.
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RYAT3

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Re: PIR Too Many False Positives
« Reply #7 on: June 17, 2014, 05:05:29 PM »

Not man-made light sources, no.  The one that is particularly useless for PIR sensing probably sees more sunlight on the ground than the other ones do.

Are these cams outdoor or against a window?  You would probably only pick up inside PIR behind a window.
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cmontyburns

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Re: PIR Too Many False Positives
« Reply #8 on: June 17, 2014, 07:15:31 PM »

Are these cams outdoor or against a window?  You would probably only pick up inside PIR behind a window.


They're outside.
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RYAT3

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Re: PIR Too Many False Positives
« Reply #9 on: June 25, 2014, 05:31:42 AM »

They're outside.

Hard to say. What are you looking at? Sunlight on the ground?
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cmontyburns

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Re: PIR Too Many False Positives
« Reply #10 on: June 25, 2014, 08:03:38 PM »

Hard to say. What are you looking at? Sunlight on the ground?

Mostly.

I've gotten things resolved to my satisfaction.  The cameras that are good with the PIR still use the PIR.  Those that are not now use the regular software motion sensing (I borrowed a Windows laptop from a friend to configure it). 
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