remove outliers from a circumference

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luca antonioli
luca antonioli 2019-10-16
评论： darova 2019-10-17
hi guys.. I have a series of points, those points generates a sort of circumference/ellipse in the 3d space ( intersection between a shpere and a cone).. i want to get rid of the outliers....I've tried using rmoutliers, but nothing.. can you help me?

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darova
darova 2019-10-16
Here is an idea:
x0 = mean(x); % Choose some center point (maybe approximately)
y0 = mean(y);
[t,r] = cart2pol(x,y); % convert your data to polar system
[~,ix] = sort(t); % sort your data by angle
tol = 0.4; % some tolerance
ix1 = find(diff(r(ix) > tol); % find values where difference of radius is too big
ind = ix(ix1); % indices of outlier points
plot3(x(ind),y(ind),z(ind),'or')
321.png
  2 个评论
luca antonioli
luca antonioli 2019-10-17
yes, it is a good idea..but how to consider the center of the circumference?
you calculate x0 and y0 but you dont use these points!
darova
darova 2019-10-17
Opps! Data should be replaced to 'origin'. Try:
[t,r] = cart2pol(x-x0,y-y0); % convert your data to polar system

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