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Re: Minimum area ellipse - quadratic optimisation? [message #47606 is a reply to message #47561]

Tue, 21 February 2006 07:56

greg michael
Messages: 163
Registered: January 2006

Senior Member

Thinking some more, I think I'd not pick the furthest point to choose
the axis, but find the direction with greatest moment (is that what
it's called?) - i.e. maximise sigma (r.cos(th-phi)), varying ph, with
r, th defining the point position from your centre. You might then pick
radii which enclose some sensible proportion of the points (90%) to get
better representative ellipses.

greg

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[Message index]

		Minimum area ellipse - quadratic optimisation? By: Olivia on Thu, 16 February 2006 06:19
		Re: Minimum area ellipse - quadratic optimisation? By: greg michael on Tue, 21 February 2006 07:56
		Re: Minimum area ellipse - quadratic optimisation? By: Paolo Grigis on Mon, 20 February 2006 09:41
		Re: Minimum area ellipse - quadratic optimisation? By: Olivia on Mon, 20 February 2006 08:48

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