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Today's Topics:
1. Re: despeckle filter (David Bate)
2. Re: despeckle filter (Joerg Weber)
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Message: 1
Date: Sat, 26 May 2018 20:14:05 +0100
From: "David Bate" <[email protected]>
To: "'Motion discussion list'" <[email protected]>
Subject: Re: [Motion-user] despeckle filter
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"
Harlan,
Thanks for your reply. I have been using Motion on this Pi for over a year. It
is set up as a CCTV on the front of our house.
I bought another sd card yesterday and installed motion from"
https://jarlowrey.com/blog/rpi-with-motion.html"; today
Same problem.
Eventually found that the video cable is faulty
I now have a spare pi setup sd.
My original Motion set up was using
"http://www.joakimlahtinen.se/2016/installing-motion-on-raspberry-pi-2-jessie/";
which still works fine since I changed the video cable.
Best Regards
David Bate
1 Belgrave Place
Birkdale
Southport
Merseyside
PR8 2EF
01704 564 132
07836 328 614
From: Harlan Daneker <[email protected]>
Sent: 26 May 2018 17:09
To: Motion discussion list <[email protected]>
Subject: [Motion-user] despeckle filter
Hi:
I have some understanding of the despeckle filter, but I don't understand the
(l) labeling. It labels an area, but for how long? Is it until motion is
restarted?
If your looking at a shadow from a tree blowing in the wind it moves all day
with the sun, so if the label is permanent my entire back yard would be labeled
until I restart motion.
I don't see anything here about this.
http://emit.demon.co.uk/motion/
Thanks,
Harlan
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Message: 2
Date: Sat, 26 May 2018 21:51:08 +0000
From: "Joerg Weber" <[email protected]>
To: "Motion discussion list" <[email protected]>
Subject: Re: [Motion-user] despeckle filter
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"
Hello Harlan,
despeckle (and labeling) is done on a per frame basis only. Despeckle (eEdD) is
kind of a de-noiser. Next level of eliminating false positive pixels is
labeling. Areas of contiguous motion pixels are identified and 'labeled'. After
identifying all possible labels in a frame, the label containing the largest
number of motion pixels (or was it the top 2 or 3 altogether? Can't remember
actually.) wins the race. Only the motion pixels of that label are counted as
motion pixels for that entire frame. That's why you have to set a slightly
lower threshold when enabling labeling to get the same sensitivity. For the
next frame, the same procedure starts from scratch.
Brgds Joerg.
26. Mai 2018 18:11 Uhr, "Harlan Daneker" schrieb:
Hi:
I have some understanding of the despeckle filter, but I don't understand the
(l) labeling. It labels an area, but for how long? Is it until motion is
restarted?
If your looking at a shadow from a tree blowing in the wind it moves all day
with the sun, so if the label is permanent my entire back yard would be labeled
until I restart motion.
I don't see anything here about this.
http://emit.demon.co.uk/motion/ (http://emit.demon.co.uk/motion/)
Thanks,
Harlan
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