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how do you get the centroid of an irregular shape using OpenCV?
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So, if you hang a shape from two different points (one at a time) and draw a line straight down from each point, the center of mass is where those lines intersect. This technique can be used for any irregular two-dimensional shape.
I'd recommend looking at the cv::Moments (C++) or cvMoments (C) function.
This StackOverflow thread gives some example code for a problem very similar to yours.
This post goes into some of the theory related to finding object center-points.
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