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Today's Topics:
1. Re: motion triggering on white pixels? (Joerg Weber)
2. Re: motion triggering on white pixels? (Ted Timmons)
3. Re: motion triggering on white pixels? (Joerg Weber)
----------------------------------------------------------------------
Message: 1
Date: Fri, 10 Mar 2017 22:39:11 +0000
From: "Joerg Weber" <mot...@alcatraz.ath.cx>
Subject: Re: [Motion-user] motion triggering on white pixels?
To: "Motion discussion list" <motion-user@lists.sourceforge.net>
Message-ID: <346a9ca987f6de22f293caf571aa8219@10.1.1.1>
Content-Type: text/plain; charset="utf-8"
Hi Ted,
I can see that you have enabled 'noise_tune'. This feature was developed at a
time, when the typical camera was hooked up to a capture card, producing
different levels of noise depending on the actual light condition. With modern
H.264 streams, noise is efficiently suppressed by the codec, so that the
noise_tune algo comes up with a noise level of 12 maybe. This is way too
sensitive, triggering lots of false positives.
I recommend to turn noise_tune off and set a noise level of 20. Have a look at
the debug videos to see if that cures the problem.
Brgds Joerg.
9. M?rz 2017 22:10 Uhr, "Ted Timmons" schrieb:
Here's the relevant conf bits:
https://gist.github.com/tedder/7181a73ca05736d0b5da0bd6c94f2094
(https://gist.github.com/tedder/7181a73ca05736d0b5da0bd6c94f2094)
I enabled debug video, I'll post it when it happens again.
On Thu, Mar 9, 2017 at 11:20 AM Ted Timmons wrote: I'm seeing this
occasionally- motion thinks the whitest part of a camera's image is motion.
Here are samples:
http://tedder-motion.s3-website-us-west-2.amazonaws.com/wm/m/12-20170309111216.avi.webm
(http://tedder-motion.s3-website-us-west-2.amazonaws.com/wm/m/12-20170309111216.avi.webm)
http://tedder-motion.s3-website-us-west-2.amazonaws.com/wm/m/13-20170309111526.avi.webm
(http://tedder-motion.s3-website-us-west-2.amazonaws.com/wm/m/13-20170309111526.avi.webm)
I have switch filters and some other automatic stuff on but it's still
happening- any tips? The size of the motion detection is large enough that I
can't simply increase the "min pixels changed", and it seems strange to mask
the center of an image.
PS: getting back into the 'motion' world, I ran it a bunch in 2005-2007. Now I
can use s3 and elastic transcoder and wifi cameras, which is handy!
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Message: 2
Date: Sat, 11 Mar 2017 18:13:50 +0000
From: Ted Timmons <t...@perljam.net>
Subject: Re: [Motion-user] motion triggering on white pixels?
To: Motion discussion list <motion-user@lists.sourceforge.net>
Message-ID:
<cak7gbh-ba9s0j91ca_8zudmccxzmaryk53tzfsvboh+cl3k...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
thanks Joerg, done. I don't know when I'll have the same light conditions,
but so far it hasn't happened again.
What does the noise level represent?
On Fri, Mar 10, 2017 at 3:23 PM Joerg Weber <mot...@alcatraz.ath.cx> wrote:
Hi Ted,
I can see that you have enabled 'noise_tune'. This feature was developed at
a time, when the typical camera was hooked up to a capture card, producing
different levels of noise depending on the actual light condition. With
modern H.264 streams, noise is efficiently suppressed by the codec, so that
the noise_tune algo comes up with a noise level of 12 maybe. This is way
too sensitive, triggering lots of false positives.
I recommend to turn noise_tune off and set a noise level of 20. Have a look
at the debug videos to see if that cures the problem.
Brgds Joerg.
9. M?rz 2017 22:10 Uhr, "Ted Timmons" <t...@perljam.net
<%22ted%20timmons%22%20%3c...@perljam.net%3E>> schrieb:
Here's the relevant conf bits:
https://gist.github.com/tedder/7181a73ca05736d0b5da0bd6c94f2094
I enabled debug video, I'll post it when it happens again.
On Thu, Mar 9, 2017 at 11:20 AM Ted Timmons <t...@perljam.net> wrote:
I'm seeing this occasionally- motion thinks the whitest part of a camera's
image is motion. Here are samples:
http://tedder-motion.s3-website-us-west-2.amazonaws.com/wm/m/12-20170309111216.avi.webm
http://tedder-motion.s3-website-us-west-2.amazonaws.com/wm/m/13-20170309111526.avi.webm
I have switch filters and some other automatic stuff on but it's still
happening- any tips? The size of the motion detection is large enough that
I can't simply increase the "min pixels changed", and it seems strange to
mask the center of an image.
PS: getting back into the 'motion' world, I ran it a bunch in 2005-2007.
Now I can use s3 and elastic transcoder and wifi cameras, which is handy!
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Message: 3
Date: Sat, 11 Mar 2017 20:05:53 +0000
From: "Joerg Weber" <mot...@alcatraz.ath.cx>
Subject: Re: [Motion-user] motion triggering on white pixels?
To: "Motion discussion list" <motion-user@lists.sourceforge.net>
Message-ID: <62d8cb5c9929d32e2be27c57d451c8f7@10.1.1.1>
Content-Type: text/plain; charset="utf-8"
Now that you're asking this question, let me explain in detail:
Motion detection is done at pixel level. Only brightness level is inspected.
Color information is ignored. There is a reference frame, where the most recent
brightness information - without motion - is stored. Each pixel is stored in
one byte. So each pixel can have a brightness of 0-255. Motion detection algo
compares this reference frame with the current frame pixel by pixel. A pixel is
declared to be a 'motion pixel', when the difference between ref frame and
actual frame is larger than 'noise'.
If you set 'noise' to 20, motion is detected when the brightness change is
larger than 20 (of 255). The lower you (or 'noise tune') set 'noise', the more
sensitive it gets.
An entire frame is a 'motion frame' when the number of changed pixels is above
'threshold' - after the various mask and despeckle operations.
11. M?rz 2017 19:16 Uhr, "Ted Timmons" schrieb:
thanks Joerg, done. I don't know when I'll have the same light conditions, but
so far it hasn't happened again. What does the noise level represent?
On Fri, Mar 10, 2017 at 3:23 PM Joerg Weber wrote:
Hi Ted,
I can see that you have enabled 'noise_tune'. This feature was developed at a
time, when the typical camera was hooked up to a capture card, producing
different levels of noise depending on the actual light condition. With modern
H.264 streams, noise is efficiently suppressed by the codec, so that the
noise_tune algo comes up with a noise level of 12 maybe. This is way too
sensitive, triggering lots of false positives.
I recommend to turn noise_tune off and set a noise level of 20. Have a look at
the debug videos to see if that cures the problem.
Brgds Joerg.
9. M?rz 2017 22:10 Uhr, "Ted Timmons" schrieb:
Here's the relevant conf bits:
https://gist.github.com/tedder/7181a73ca05736d0b5da0bd6c94f2094
(https://gist.github.com/tedder/7181a73ca05736d0b5da0bd6c94f2094)
I enabled debug video, I'll post it when it happens again.
On Thu, Mar 9, 2017 at 11:20 AM Ted Timmons wrote: I'm seeing this
occasionally- motion thinks the whitest part of a camera's image is motion.
Here are samples:
http://tedder-motion.s3-website-us-west-2.amazonaws.com/wm/m/12-20170309111216.avi.webm
(http://tedder-motion.s3-website-us-west-2.amazonaws.com/wm/m/12-20170309111216.avi.webm)
http://tedder-motion.s3-website-us-west-2.amazonaws.com/wm/m/13-20170309111526.avi.webm
(http://tedder-motion.s3-website-us-west-2.amazonaws.com/wm/m/13-20170309111526.avi.webm)
I have switch filters and some other automatic stuff on but it's still
happening- any tips? The size of the motion detection is large enough that I
can't simply increase the "min pixels changed", and it seems strange to mask
the center of an image.
PS: getting back into the 'motion' world, I ran it a bunch in 2005-2007. Now I
can use s3 and elastic transcoder and wifi cameras, which is handy!
------------------------------------------------------------------------------
Announcing the Oxford Dictionaries API! The API offers world-renowned
dictionary content that is easy and intuitive to access. Sign up for an
account today to start using our lexical data to power your apps and
projects. Get started today and enter our developer competition.
http://sdm.link/oxford
(http://sdm.link/oxford)_______________________________________________
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------------------------------------------------------------------------------
Announcing the Oxford Dictionaries API! The API offers world-renowned
dictionary content that is easy and intuitive to access. Sign up for an
account today to start using our lexical data to power your apps and
projects. Get started today and enter our developer competition.
http://sdm.link/oxford
------------------------------
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End of Motion-user Digest, Vol 130, Issue 8
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