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Today's Topics:
1. IR pass filter test. (Thomas Drebert)
2. Re: IR pass filter test. (Richard Bown)
3. Re: IR pass filter test. (Dave Howorth)
4. Re: IR pass filter test. ([email protected])
5. Re: IR pass filter test. (Thomas Drebert)
----------------------------------------------------------------------
Message: 1
Date: Tue, 31 Dec 2019 17:07:44 +0100
From: Thomas Drebert <[email protected]>
To: Motion discussion list <[email protected]>
Subject: [Motion-user] IR pass filter test.
Message-ID:
<CANn+32i12kLBEKEFZV+Lkue1zdSgFoCmDC4BxSGQBQVB3B=c...@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Hello,
I wanted to tell you the result of an experiment. I use an RPi NoIR
camera with IR lighting at night. But car headlights constantly
trigger motion and that can't be gotten away with the settings. So I
thought I would try a filter that only lets IR lighting through. A
look through the filter showed absolute darkness, but the camera could
still see-through. The idea was good, but it turned out that car
headlights also have a large amount of IR light, so this filter is not
useful for this purpose.
Maybe someone knows where there is spectrum information on car headlights?
regards
ThomasD
------------------------------
Message: 2
Date: Tue, 31 Dec 2019 17:09:39 +0000
From: Richard Bown <[email protected]>
To: [email protected]
Subject: Re: [Motion-user] IR pass filter test.
Message-ID: <[email protected]>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi Thomas
car headlights are a pain, the incandescent type definitely emit IR as
they get hot.
The LED type are a mixed bunch, the white that have a blue tinge to them
emit less than the warmer white which do emit some IR ,
BUT High power modern LEDs still generate heat and as a heat source
generate IR.
Any documentation you find will be under lab conditions, so not useful
in the real world.
You should be able to find a point by altering the trigger threshold
where you can trigger motion from the thermal mass of a human and ignore
smaller thermal sources.
Catch 22 is in the winter humans use more thermal insulation than cars,
so the areas emitting IR could be less, not a problem approaching
summer as humans use less insulation, and its lighter longer so less use
of lights.
I suspect you will end up using a different camera angle to avoid this
problem. Looking down from above the viewed area avoids direct external
light.
not very helpful, but Happy New Year anyway
Richard
On 31/12/2019 16:07, Thomas Drebert wrote:
> Hello,
>
> I wanted to tell you the result of an experiment. I use an RPi NoIR
> camera with IR lighting at night. But car headlights constantly
> trigger motion and that can't be gotten away with the settings. So I
> thought I would try a filter that only lets IR lighting through. A
> look through the filter showed absolute darkness, but the camera could
> still see-through. The idea was good, but it turned out that car
> headlights also have a large amount of IR light, so this filter is not
> useful for this purpose.
>
> Maybe someone knows where there is spectrum information on car headlights?
>
> regards
> ThomasD
>
>
> _______________________________________________
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>
--
Best wishes /73
Richard Bown
Email : [email protected]
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------------------------------
Message: 3
Date: Tue, 31 Dec 2019 17:14:29 +0000
From: Dave Howorth <[email protected]>
To: [email protected]
Subject: Re: [Motion-user] IR pass filter test.
Message-ID: <[email protected]>
Content-Type: text/plain; charset=US-ASCII
On Tue, 31 Dec 2019 17:07:44 +0100
Thomas Drebert <[email protected]> wrote:
> Hello,
>
> I wanted to tell you the result of an experiment. I use an RPi NoIR
> camera with IR lighting at night. But car headlights constantly
> trigger motion and that can't be gotten away with the settings. So I
> thought I would try a filter that only lets IR lighting through. A
> look through the filter showed absolute darkness, but the camera could
> still see-through. The idea was good, but it turned out that car
> headlights also have a large amount of IR light, so this filter is not
> useful for this purpose.
>
> Maybe someone knows where there is spectrum information on car
> headlights?
I'd expect any incandescent lamp (i.e. old-fashioned headlight,
including halogen) to include a lot of IR due to the way they work.
i.e. they heat something up until it glows - black-body radiation. HID,
LED & laser headlamps will have a lot less I expect.
------------------------------
Message: 4
Date: Tue, 31 Dec 2019 20:33:30 +0200
From: [email protected]
To: Motion discussion list <[email protected]>
Subject: Re: [Motion-user] IR pass filter test.
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"
An HTML attachment was scrubbed...
------------------------------
Message: 5
Date: Tue, 31 Dec 2019 20:25:22 +0100
From: Thomas Drebert <[email protected]>
To: Motion discussion list <[email protected]>
Subject: Re: [Motion-user] IR pass filter test.
Message-ID:
<CANn+32h5OwqHtHpr7B=jFT7BTFxyR9x=UdL0pA1=tz+waoj...@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Am Di., 31. Dez. 2019 um 19:36 Uhr schrieb manu.kemppainen--- via
Motion-user <[email protected]>:
>
> Have you considered "lightswitch" setting together with possible mask for
> avoiding headlight alarms?
>
Hello,
Yes, I have, I try all values from 1 to 100, but nothing helped.
All with a static and dynamic mask.
regards
ThomasD
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