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From: Mark Jones <mark.jones@mathworks.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Image Acquisition - winvideo device 'disappears'
Date: Fri, 30 Oct 2009 15:05:27 -0400
Organization: The MathWorks, Inc.
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To: Borys Golik <boris.golik@gmx.de>
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Hi Boris,

If you only have the frame grabber plugged in, does it still fail to 
show up again after an IMAQRESET?  If it does then appear after an 
IMAQRESET then it may be an interaction between the two drivers.

We have not currently know of any issues of this nature with other 
drivers and it is possible that it is a bug in the driver or our own 
code.  You may wish to open a technical support request at:

http://www.mathworks.com/support/

Mark

Borys Golik wrote:
> Hi,
> 
> I'm using MATLAB R2008b and the Image Acquisition Toolbox. I've got a MATRIX VISION framegrabber. After starting MATLAB it's found correctly by winvideo adaptor, this means imaqhwinfo('winvideo') lists it in the DeviceIDs and I can see a preview with videoinput and preview functions. So far... But if I then call the imaqreset function the winvideo adaptor doesn't show me my framegrabber anymore, I only see my webcam. The only way to create a videoinput object I've figured out is to close MATLAB and start it again. Other devices (e.g. my webcam) are not affected by this issue, which means they are still there after imaqreset. it's only about this particular framegrabber. This behaviour is reproducible within imaqtool GUI, which is probably just a frontend for IMAQ functions, so it's not surprising me.
> 
> Does anybody know a solution? I don't get any errors or warnings which might help... The framegrabber is just not there...
> 
> Thanks a lot in advance!
> Boris