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hand mouse patent

I'm working with opencv on a system to detect and track a user's hand and use its movements as it was a mouse.
So far so good, but then I found this patent: patent.
Did I understand it correctly? Has this obvious idea been patented?
Please tell me that it is not like that.

BTW it would really a shame; patents should be a way to encourage people creativity, not to put them in minefield.

hand mouse patent

I'm working with opencv on a system to detect and track a user's hand and use its movements as it was a mouse.
So far so good, but then I found this patent: patent.
Did I understand it correctly? Has this obvious idea been patented?
Please tell me that it is not like that.

BTW it would really be a shame; patents should be a way to encourage people creativity, not to put them in minefield.