Ohad.Levy | 1 Aug 08:58 2007

RE: webcam security software

What about motion detection?

I think the whole point is to be able to record only when something is different in the frame…..

 

Ohad

 

From: linux-il-bounce-NSemkxREmS1YZAO8hgG6+w@public.gmane.org [mailto:linux-il-bounce-NSemkxREmS1YZAO8hgG6+w@public.gmane.org] On Behalf Of Erez D
Sent: Tuesday, July 31, 2007 7:19 PM
To: linux-il-NSemkxREmS1YZAO8hgG6+w@public.gmane.org
Subject: Re: webcam security software

 

vidcat
(probably with a 2 line cgi script)

cheers,
erez.

On 7/31/07, Alon Altman <alon-nZnUDuwb5ds@public.gmane.org> wrote:

I second the recommendation on "motion". It works great with cheap
webcams, and is higly customizable.

On 7/31/07, Ohad.Levy-d0qZbvYSIPpWk0Htik3J/w@public.gmane.org <Ohad.Levy-d0qZbvYSIPpWk0Htik3J/w@public.gmane.org> wrote:
> Try zoneminder (might be an over kill) or motion (has a builtin web
> server)
>
> Works both quite well
>
> Ohad
>
> -----Original Message-----
> From: linux-il-bounce-NSemkxREmS27zVTa1ElGIQ@public.gmane.orgil
> [mailto: linux-il-bounce-NSemkxREmS27zVTa1ElGIQ@public.gmane.orgil] On Behalf Of Hetz Ben Hamo
> Sent: Sunday, July 22, 2007 10:57 AM
> To: gsm-I8pGow6HJUGaMJb+Lgu22Q@public.gmane.org
> Cc: Israel Linux Mailing list
> Subject: Re: webcam security software
>
> It really depends how do you access this webcam.
> If it had a V4L/V4L2 interface, then the v4l userspace application
> package has a program which is called "webcam" which just exactly what
> you want.
>
> If you access it through http for example, then you can use wget in a
> cron and be done with it.
>
> Thanks,
> Hetz
>
> On 7/22/07, Geoffrey S. Mendelson <gsm-I8pGow6HJUGaMJb+Lgu22Q@public.gmane.org> wrote:
> > I'm looking for a program that runs under Linux that will once a
> minute
> > connect to a webcam and save a frame. It can be just the single
> > frame saver as I can run it in a loop or with cron.
> >
> > The Webcam is a stand alone device, not a V4L device.
> >
> > I need it for a home grown security system.
> >
> > Thanks, Geoff.
> > --
> > Geoffrey S. Mendelson, Jerusalem, Israelgsm-I8pGow6HJUGaMJb+Lgu22Q@public.gmane.org
> N3OWJ/4X1GM
> > IL Voice: (07)-7424-1667 U.S. Voice: 1-215-821-1838
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>
>
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Amos Shapira | 1 Aug 10:00 2007
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Re: webcam security software

On 01/08/07, Ohad.Levy-d0qZbvYSIPpWk0Htik3J/w@public.gmane.org <Ohad.Levy-d0qZbvYSIPpWk0Htik3J/w@public.gmane.org> wrote:

What about motion detection?

I think the whole point is to be able to record only when something is different in the frame…..


There are apparently many such solutions. A quick google for "linux webcam motion detect" came up with Gspy ( http://gspy.sourceforge.net/) as the first link, with many others.

--Amos

Geoffrey S. Mendelson | 1 Aug 10:18 2007

Re: webcam security software

On Wed, Aug 01, 2007 at 08:58:48AM +0200, Ohad.Levy@... wrote:

> I think the whole point is to be able to record only when something is
> different in the frame.....

Actually in my case, not. Being able to record one frame a minute
is good enough. It's just to catch people doing things they should
not be doing, such as eating in the library. Motion detection would
be a waste, during school hours the cameras always see motion. 

After hours would be different, but again just a record of someone
being there would be enough.

Geoff.

--

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Amos Shapira | 1 Aug 11:02 2007
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Re: webcam security software

On 01/08/07, Geoffrey S. Mendelson <gsm-I8pGow6HJUGaMJb+Lgu22Q@public.gmane.org> wrote:

Actually in my case, not. Being able to record one frame a minute
is good enough. It's just to catch people doing things they should
not be doing, such as eating in the library. Motion detection would
be a waste, during school hours the cameras always see motion.

After hours would be different, but again just a record of someone
being there would be enough.

I might be wrong but I got the impression that at least some of those "motion detection" programs are geared more towards "change in frame" - i.e. if the current frame contains exactly the same info as the previous one then toss it. It saves both space/bandwidth (e.g. the English guy who caught a burglar a few years ago by streaming webcam over the net from his apartment) as well as your time looking for the interesting frames.

--Amos

Geoffrey S. Mendelson | 1 Aug 11:55 2007

Re: webcam security software

On Wed, Aug 01, 2007 at 07:02:26PM +1000, Amos Shapira wrote:
> I might be wrong but I got the impression that at least some of those
> "motion detection" programs are geared more towards "change in frame" - i.e.
> if the current frame contains exactly the same info as the previous one then
> toss it. It saves both space/bandwidth (e.g. the English guy who caught a
> burglar a few years ago by streaming webcam over the net from his apartment)
> as well as your time looking for the interesting frames.

For the case I need, it would be only useful part of the time.

Most of the time there is activity, it is normal activity and does
not need to be recorded except for historical purposes, such as
finding a crust of bread under a chair and trying to find out
who was eating it. Determining that it was someone eating and not
someone reading, or doing their homework or moving their hands while
talking is probably far beyond anything available,

During off hours, it would be useful to record at one frame a second,
so that would give you 2 minutes of video an hour. Not a lot to watch
if it was needed to determine who was present. There is no need for
detailed videos of someone emptying trash cans, washing the floor,
etc, and even if something nefarious was commited a video record of
their presence is enough.

IMHO the knowledge that the cameras are active 24/7 and recorded would
be enough to prevent pranks or minor vandalism.

Geoff.
--

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Shachar Shemesh | 1 Aug 12:27 2007

Re: webcam security software

Geoffrey S. Mendelson wrote:
>
> IMHO the knowledge that the cameras are active 24/7 and recorded would
> be enough to prevent pranks or minor vandalism.
>
> Geoff.
>   
I suggest you read http://blog.shemesh.biz/?p=453

Shachar

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Geoffrey S. Mendelson | 1 Aug 12:39 2007

Re: webcam security software

On Wed, Aug 01, 2007 at 01:27:22PM +0300, Shachar Shemesh wrote:
> I suggest you read http://blog.shemesh.biz/?p=453

Thanks, but I can't. :-(

Geoff.
--

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Shachar Shemesh | 1 Aug 13:00 2007

Re: webcam security software

Geoffrey S. Mendelson wrote:
> On Wed, Aug 01, 2007 at 01:27:22PM +0300, Shachar Shemesh wrote:
>   
>> I suggest you read http://blog.shemesh.biz/?p=453
>>     
>
> Thanks, but I can't. :-(
>
> Geoff.
>   
In a nutshell, it talks about the importance of both resolution and
frames per second in order to actually identify who the ! <at> #($! <at>  is in
that picture.

Shachar

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Orr Dunkelman | 1 Aug 17:16 2007
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[HAIFUX Lecture] Introduction to Sockets Programming by Guy Keren

Next Monday, 6th of August, at 18:30 the Haifa Linux Club, will gather to
hear Guy Keren's inspiring talk about

                       Introduction to Socket Programming

The lecture will cover the basic ideas behind sockets, TCP/IP, and all
that needed to understand the basics of programming applications that
run over the net.

Slides are available online at http://www.haifux.org/lectures/171/

======================================================================

We meet in Taub building, room 3. For instructions see:
http://www.haifux.org/where.html

Attendance is free, and you are all invited!

======================================================================

Future Lectures:

172  	Linux Kernel Networking Overview 	Rami Rosen  	20/8/2007  	
173 	An overview of Haskell part II               Haggai Eran 	3/9/2007

We are always looking for interesting lectures. If you wish to contribute  a
lecture to the 2007 lecture season - drop us a line at webmaster@...

--

-- 
Orr Dunkelman,
Orr.Dunkelman@...

"Any human thing supposed to be complete, must for that reason infallibly
be faulty" -- Herman Melville, Moby Dick.

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Geoffrey S. Mendelson | 1 Aug 17:16 2007

Stupid question about Fedora mirrors

According to http://mirrors.fedoraproject.org/publiclist

There are no public mirrors of Fedora in Israel. Is that true?

Thanks, Geoff.
--

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Gmane