Function 'getdata' from the Image Acquisition Toolbox very slow

2019 8 21
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更新时间：2020 9 22
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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

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回答（2 个）

Shashwat Bajpai
Shashwat Bajpai 2019-12-10
编辑：Shashwat Bajpai 2019-12-10

1 个投票

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!

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Tutu
Tutu 2019-12-10
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
Shashwat Bajpai 2019-12-11
I believe you'll need to assign cores explicitly because in multi core computers some cores remain idle to save resources.
Tutu
Tutu 2019-12-11
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

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