Function 'getdata' from the Image Acquisition Toolbox very slow

Hello,

I am using the function 'getdata' from the Image Acquisition Toolbox in a project. However, the data transfer speed is about 1.5 GB/s. It is my understanding that the data are logged in a Buffer localized on the CPU RAM. Hence, when using 'getadata' to bring the data to the CPU RAM as a variable, the speed should live up to the RAM speed - in my case 21,3 GB/s.

How can I increase this speed?

Any help will be appreciated, please.

Thanks

Answer 1

[Shashwat Bajpai]

Hey,

getdata supports multicore.If you have multiple cores you can try using them to increase the speed.

Please refer the following documentation on getdata for further assistance:

https://www.mathworks.com/help/imaq/getdata.html?searchHighlight=getdata&s_tid=doc_srchtitle

Hope this helps!

[Tutu]

Hi Shashwat Bajpai,

Thank you very much for your answer.

Forwarding the structure 'videoinput' to a 'parfeval' execution - with a 'getdata' executed in it - does not seem to be working for me.

Are you rather suggesting that a multiple call of getdata will be automatically executed on different cores? Do I need to extend the number of pools accordingly?

The link you gave to me does not talk about multicore.

Thanks,

Tual

[Shashwat Bajpai]

I believe you'll need to assign cores explicitly because in multi core computers some cores remain idle to save resources.

[Tutu]

Great! Could you point toward ressources to dig this matter, and check that this suggestion is working for my issue, please?

Or better, if you could write a bit of code to demonstrate the methodology with 'getdata', I would be very grateful.

Thanks,

Tual

Answer 2

[Suzanne Onstwedder]

Is there an answer already?