Yes you can use the Arabic morphological analizer Alkhalil. It free and open source.

link for downlowd: http://sourceforge.net/projects/alkhalil/

Dear Ibrahim,

There is the following patent:

http://www.google.com.lb/patents/US20100185436

And paper I am attaching below.

You can also find on Google some application to do the task, but I did not test it.

I hope this helps.

Regards,

Thank you. This seems to be more complex as these references talk about the meter. My question is more simple. I want just to extract the scheme of a word i.e. the scheme of "استخرج" is"استفعل".

Yes you can use the Arabic morphological analizer Alkhalil. It free and open source.

link for downlowd: http://sourceforge.net/projects/alkhalil/

alkhalil is certainly a good tool. Perhaps it needs to be adpated for vocalized texts.

Is there any other tools?

You can use MADA (free) or SAMA (Not free)

To the best of my knowledge, MADA does not provide the scheme

Yes, its true, and there is the same case where you use SAMA

To the best of my knowledge, only Alkhalil provide the scheme and there is no problem with vocalized texts.