Experimental Physics and
Industrial Control System

<[email protected]> · Wed, 16 Dec 2009 21:15:59 -0000

Yes, we are responsible for the edm video widget and use it extensively.
You have to specify a PV for the image array and another two for the
width and height. It only does black and white video streams. The person
to talk to is Steve Singleton.

Streaming video uncompressed is a bit network intensive, so we have also
written an area detector plug-in (Linux only, I'm afraid) which is a
jpeg video server - the basic idea was to produce a video stream
indistinguishable from the Axis Webcams we have all over the place. This
works well but isn't quite ready for prime time yet, and it means that
we can use standard video clients to handle colour video streams. This
seems to be a far better way to go - Channel Access isn't ideal for
everything. Tom Cobb has been doing this work.

Cheers,

Nick Rees
Principal Software Engineer           Phone: +44 (0)1235-778430
Diamond Light Source                  Fax:   +44 (0)1235-446713 

> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of Mark Rivers
> Sent: 16 December 2009 01:18
> To: Kevin Anderson; [email protected]
> Subject: RE: displaying areaDetector Video with EDM or MEDM
> 
> I think the EDM display does work and is being used a Diamond.
>  
> All EPICS waveform records are viewed by EPICS as 1-D, 
> including those used by areaDetector.  There are additional 
> PVs that are used to describe the actual dimensions of the array.
>  
> Mark
>  
> 
> ________________________________
> 
> From: [email protected] on behalf of Kevin Anderson
> Sent: Tue 12/15/2009 4:33 PM
> To: [email protected]
> Subject: Re: displaying areaDetector Video with EDM or MEDM
> 
> 
> 
> There is a "2D Profile Monitor" included in the EDM source, 
> though I don't think it is added to the list of edm objects 
> by default.
> 
> Last time I checked there wasn't much documentation for it, 
> but as I recall it needs to read from a 1D waveform PV, which 
> would seem to make it incompatible with the 2D-array data 
> type used by this ImageJ plugin.
> 
> -Kevin
> 
> > As far as I know there is no way to do this in MEDM. I have 
> not used EDM much but unless an image viewer has been added I 
> don't think that it is possible there either. It should be 
> possible to add one though.
> >
> > John
> 
> 
> 
> 

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System