Experimental Physics and
Industrial Control System

Hi Mark,

thanks for the tips. I will give that a try. The first step is to do an FFT on the image data.

Am Donnerstag, 24. September 2020, 18:29:07 CEST schrieb Mark Rivers:

> Hi J�

>

> > One solution would be to implement all the magic math we use as plugins

> > for areaDetector

> >

> > and combine them to the necessary chain.

> >

> > But the machine we use to read the camera is not powerful enough (Odroid

> > XU1) to do that.

> >

> > What would be the performance if we would run the plugins on a separate

> > machine?

> What you propose is quite reasonable.  The camera IOC would need to run the

> NDPluginPva, which is quite efficient.  Here is a screen shot where it is

> processing 784 frames/s of 1024x1024 Float32 images = 3.2 GB/s.

>

> [cid:[email protected]]

>

> You can then run an IOC on a more powerful machine with the pvaDriver.  Here

> is a screen shot when it is processing 303 frame/s of 1024x1024 Float32

> images = 1.2 GB/s.

>

> [cid:[email protected]]

>

> Of course you need to make sure the network link between the machines can

> handle the required bandwidth.

> > And how to make sure that they all are in sync?

>

> Can you explain what you mean by that?

I would need to make sure that all the post processed images are based on the live image that is displayed. I guess that if one of the processes takes some time (more time then the trigger rate of the camera) EPICS-QT will update the live image before the post process is finished and the data displayed. The reason is, that we want to store all the data in a common file at the end..

J�/p>

>

> Mark

>

> ________________________________

> From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of J�Dreyer via

> Tech-talk <tech-talk at aps.anl.gov> Sent: Thursday, September 24, 2020 8:53

> AM

> To: tech-talk at aps.anl.gov

> Subject: EPICS QT question

>

>

> Hi,

>

>

> I'm currently developing an application based on EPICS QT. This toolkit

> makes things so much easier than using PyQwt which I have used before for

> the first version of the app. The app reads a picture from a camera,

> displays the original and does some processing of the image like

> fouriertransforms,  peak finding and fitting etc.

>

>

> To make sure the analyzed pictures and the camera image are in sync, I

> wanted to read the image data from a PvaClient and display it in an

> QEImage.Then do all the math and display the results in other QEImage

> widgets.

>

> But unfortunately the set(Pva)Image function is private.

>

>

> One solution would be to implement all the magic math we use as plugins for

> areaDetector and combine them to the necessary chain. But the machine we

> use to read the camera is not powerful enough (Odroid XU1) to do that. What

> would be the performance if we would run the plugins on a separate machine?

> And how to make sure that they all are in sync?

>

>

> Are there any experiences with such a scenario?

>

>

> Regards

>

>

> J�Dreyer

Replies:

Re: EPICS QT question Mark Rivers via Tech-talk

References:

EPICS QT question Jörn Dreyer via Tech-talk

Re: EPICS QT question Mark Rivers via Tech-talk

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