RE: NDTransform Image Delay

[<nick.rees@diamond.ac.uk>]

Hi Mike,

 

I suspect you will also see your queue build up, and I presume the depth of the image queue is about 50 images, and this is what is giving the 5 second delay. If you want to see an image without delay, you need a short queue and have to accept the dropped frames.

 

Cheers,

 

Nick Rees

Principal Software Engineer           Phone: +44 (0)1235-778430

Diamond Light Source                  Fax:   +44 (0)1235-446713

 

From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of ulrik.pedersen@diamond.ac.uk
Sent: 06 August 2015 11:53
To: Slade, Michael (STFC,RAL,AST); tech-talk@aps.anl.gov
Subject: RE: NDTransform Image Delay

 

Hi Mike,

 

What version of areaDetector are you using? In areaDetector 1-NN this plugin performed rather unimpressively. However in areaDetector 2 (ADCore); Chris Roehrig did an “Extensive re-write” (May 2014) which increased performance e19490e.

 

Cheers,

Ulrik

 

From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of michael.slade@stfc.ac.uk
Sent: 06 August 2015 11:21
To: tech-talk@aps.anl.gov
Subject: NDTransform Image Delay

 

I am using the NDTransform plugin for AreaDetector, so I am able to rotate images acquired by a camera. This works completely fine, unless the acquire time of the camera is 0.1 or smaller (reading in images at 10Hz or faster).

At these rates, there is a delay applied to the camera, i.e, if the camera sees something different, the image the AreaDetector software returns won’t show the change for around 5 seconds. I assumed that the rotation was just taking a long time to process, but the overlays I apply after the transformation have no delay at all. I have also noticed that when this delay occurs, the ‘DroppedArrays’ PV for the NDTransform plugin increases.

Is there a way to stop this delay from happening?

 

Thanks,

Mike

 

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Diamond Light Source Ltd. cannot guarantee that this e-mail or any attachments are free from viruses and we cannot accept liability for any damage which you may sustain as a result of software viruses which may be transmitted in or with the message.
Diamond Light Source Limited (company no. 4375679). Registered in England and Wales with its registered office at Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom