ROI

[hayg25]

Dear All,
I need to get the beam characteristics at Yag screen with noise (Dark current).
Is there a way to select region of interest from the Lima Device server ?
My problem is that BPM failed sometimes to locate the beam position, when we have background.

Thanks

[laurent-claustre]

Hi Hayg,
yes you can set an ROI by using the attribute image_roi and set an crop on your detector. ROI parameters is a list of value as:
X, Y, WIDTH, HEIGHT in pixel unit.

[hayg25]

Hi Laurent,
many thanks. By the way I am looking information concerning the methods behind BPMs, how it calculates the beam position. Where could I find some notes on that?

[laurent-claustre]

Hi Hayg,
There is an article somewhere which describes the algorithm I will send you the file if can find it. In the mean time you may have a look on the Bpm C++ code, not so complicated, there are some comments into the code. The main file is:
third-party/Processlib/tasks/src/Bpm.cpp

[laurent-claustre]

Hi Hayg,
I will send you a "paper" which explains the principle and partially the algorithm choosen.

[hayg25]

Great !
Thx

[hayg25]

Hi Laurent,
do you have the article you were talking about ?
Thanks
H

[laurent-claustre]

Hi @hayg25 , we are still looking for a pertinent paper or what ever which can describe well the algorithm.