How can I get the angle between centroid of a binary object and a point on it's boundary?

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Casio Uploader
Casio Uploader 2019-11-26
回答： KSSV 2019-11-26
How to calculate angle between centroid of a binary object and a point on it's boundary?
For example as in attached figure I want the angle between 'a' and centrioid is near to "0 degree" and for 'b' it will be near to "45 degree (maybe 42 or 40)"

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KSSV
KSSV 2019-11-26
Get the centorid of the image by using mean. So I assume you know all the points A,B,C,D and O. You have (x,y) in hand. If you want angle w.r.t x-axes..simply find slope and get tan inverse of it.
th = atan((y2-y1)/(x2-x1)) ;
If you want angle between two lines...say OA and OB, ude dot product.
cos(th) = oa.ob/(|oa|*|ob|) ;

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