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From: Navigateur on 3 Aug 2010 17:26
I'm a beginner but I'm determined to do this.

How, in a nutshell, do I make a driver that is automatically installed
upon plugging in 2 specific webcams, that when called upon does some
real-time vision-based detection on the images (using OpenCV, my own
code) and then exposes custom-fired events and variables based on what
is found in the detection, which can be accessed system-wide by any
application, but which does not expose the images from the cameras, or
automatically install default drivers for webcams.

In other words, a vision-based user interface.

I'm aware of UVC, and AvStream.

Any ideas for ANY part of this are welcome. I'll take all ideas you
have very seriously.

Many thanks,
N
From: Maxim S. Shatskih on 4 Aug 2010 01:12
Just read the video stream off the camera (ANY camera) using DirectShow, and do your detection there.

--
Maxim S. Shatskih
Windows DDK MVP
maxim(a)storagecraft.com
http://www.storagecraft.com

"Navigateur" <naveen.chwl(a)gmail.com> wrote in message news:86408c5d-c888-4395-98c4-af3fcdf86d2a(a)l14g2000yql.googlegroups.com...
> I'm a beginner but I'm determined to do this.
>
> How, in a nutshell, do I make a driver that is automatically installed
> upon plugging in 2 specific webcams, that when called upon does some
> real-time vision-based detection on the images (using OpenCV, my own
> code) and then exposes custom-fired events and variables based on what
> is found in the detection, which can be accessed system-wide by any
> application, but which does not expose the images from the cameras, or
> automatically install default drivers for webcams.
>
> In other words, a vision-based user interface.
>
> I'm aware of UVC, and AvStream.
>
> Any ideas for ANY part of this are welcome. I'll take all ideas you
> have very seriously.
>
> Many thanks,
> N
From: Navigateur on 5 Aug 2010 17:48
What's your recommended overall architecture for this?

How would I make the 2 specific cameras be recognized and registered
as one (specific) device? Could I still use UVC drivers + a custom KS
proxy DirectShow plug-in? For events/variables, should I use
DirectShow events, CORBA or something else? (given that I want the
events/variables to be easily available to multiple applications
running on all platforms, not only by native Windows apps).

I want to make it as simple as possible for end-users to use and for
third-party application developers to develop with. Given this, how
would you design its overall architecture?

On Aug 4, 6:12 am, "Maxim S. Shatskih"
<ma...(a)storagecraft.com.no.spam> wrote:
>     Just read the video stream off the camera (ANY camera) using DirectShow, and do your detection there.
>
> --
> Maxim S. Shatskih
> Windows DDK MVP
> ma...(a)storagecraft.comhttp://www.storagecraft.com
>
> "Navigateur" <naveen.c...(a)gmail.com> wrote in messagenews:86408c5d-c888-4395-98c4-af3fcdf86d2a(a)l14g2000yql.googlegroups.com...
> > I'm a beginner but I'm determined to do this.
>
> > How, in a nutshell, do I make a driver that is automatically installed
> > upon plugging in 2 specific webcams, that when called upon does some
> > real-time vision-based detection on the images (using OpenCV, my own
> > code) and then exposes custom-fired events and variables based on what
> > is found in the detection, which can be accessed system-wide by any
> > application, but which does not expose the images from the cameras, or
> > automatically install default drivers for webcams.
>
> > In other words, a vision-based user interface.
>
> > I'm aware of UVC, and AvStream.
>
> > Any ideas for ANY part of this are welcome. I'll take all ideas you
> > have very seriously.
>
> > Many thanks,
> > N
>
>

From: Maxim S. Shatskih on 6 Aug 2010 02:28
>How would I make the 2 specific cameras be recognized and registered
>as one (specific) device?

You need to design a way to merge the 2 video streams first.

Then, this "merger" should be implemented as one more DirectShow filter.

>Could I still use UVC drivers + a custom KS
>proxy DirectShow plug-in?

Yes.

>DirectShow events, CORBA

How is this related? isn't this a Linux replacement for SOAP and similar things? how is it related to video?

Surely DirectShow supports properties on filters.

--
Maxim S. Shatskih
Windows DDK MVP
maxim(a)storagecraft.com
http://www.storagecraft.com

From: Tim Roberts on 6 Aug 2010 02:44
Navigateur <naveen.chwl(a)gmail.com> wrote:
>
>What's your recommended overall architecture for this?
>
>How would I make the 2 specific cameras be recognized and registered
>as one (specific) device?

You wouldn't. You would have an APPLICATION connect to those two cameras
in standard DirectShow graphs, and have the application expose services to
clients. Perhaps as a COM server, or a network server, or some other
interprocess communication stream.

>Could I still use UVC drivers + a custom KS proxy DirectShow plug-in?

Well, if you don't want to provide streaming data from these cameras, why
would you consider combining the two in KS?

Really, that's a bad idea to begin with.

>For events/variables, should I use
>DirectShow events, CORBA or something else? (given that I want the
>events/variables to be easily available to multiple applications
>running on all platforms, not only by native Windows apps).

To go cross-platform, you're pretty much locked in to sockets.
--
Tim Roberts, timr(a)probo.com
Providenza & Boekelheide, Inc.
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