How to measure angle of laths with respect to vertical axis

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Shan Kapoor
Shan Kapoor 2012-3-19
Hi all,
I have images like below, where I am interested to measure angle each black needle makes with the vertical axis and to have a distribution something like needles with angle < 15 degree, 15-90 degree etc. Please give me some insights.
https://picasaweb.google.com/116243239493929305987/Ti5553Ti17#5721501025869642898 https://picasaweb.google.com/116243239493929305987/Ti5553Ti17#5721501293674326034
Thanks in advance
Shan Bala

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