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Subject: Re: Web cam access in Matlab
Date: Wed, 1 Oct 2008 21:24:01 +0000 (UTC)
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I was wondering if anyone else had attempted to adapt this to AXIS webcams (207MW).  I am having difficulty and was hoping to get a real-time image through matlab to do some image processing.  If you have any advice it would be appreciated.


"Michele " <denber.nospam@mindspringNOSPAM.com> wrote in message <g6nje5$m9a$1@fred.mathworks.com>...
> > I was wondering if you could list out the steps needed to
> > access the wireless IP camera. Seem to have missed some
> > steps in getting the images from the camera. Is there any
> > difference in the code for determining the code for a
> > password and non-password protected camera.
> 
> OK, quick review: this applies to Trendnet webcams, models
> 100, 200, and 400, both the wired and wireless versions. 
> I've also tested it successfully with a DLink DCS-2000
> webcam.  It may work with other types too - I suspect all
> these cameras use the same chip from some giant factory in
> Malaysia.
> 
> If your camera is not password-protected, the job is easy. 
> The following line will grab one frame from the camera and
> store it in a variable:
> 
> img = imread ('http://192.168.0.109/image.jpg') ;
> 
> (Obviously, you substitute the URL of your own camera there,
> but the file name on the server is always "image.jpg")
> 
> If your camera requires a password, imread will not work
> because there is no provision to supply one there.  You need
> to modify the urlwrite function to support the Basic
> authentication these cameras use.  You'd think that you want
> to modify urlread but there's a confusing relationship
> between imread, imwrite, urlread, and urlwrite.  That's what
> I was trying to untangle last year and you can read about it
> in my previous posts.  Anyway...
> 
> Step 1: Open up your copy of urlwrite and find the line that
> says
> 
> urlConnection = url.openConnection;
> 
> Right after that, add this:
> 
> % The following line added as per
> http://www.mathworks.com/matlabcentral/newsreader/view_thread/52859
> urlConnection.setRequestProperty('Authorization','Basic xxx') ;
> 
> Save this modified imread as imreadauth.
> 
> (Thanks again to Matthew Simoneau for that wonderful piece
> of code)
> 
> Step 2: Perform a Base64 encoding of your user name and
> password and put the resulting string in place of "xxx"
> above.  I use:
> 
> pw = base64encode ('username:password') ;
> 
> Step 3: Modify your copy of imread to call imreadauth
> instead of imread.  Now, as I mentioned in my last post, you
> can call
> 
> cam103 = imreadauth ('http://192.168.0.103/image.jpg') ;
> 
> This will log you in and retrieve the current frame to the
> variable cam103.
> 
> Obviously, there's other ways of getting your username and
> password in there, or having one function handle both
> password and non-password webcams, but this is the gist of
> it, and it works.  Cheers.
> 
> Now if only I could get some kind soul to help me figure out
> how to keep Matlab from hanging if the requested url is not
> answering...
> 
> 
>