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How can I make contour lines smoother?

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Sandy
Sandy le 14 Juin 2013
Commenté : Konstantin le 3 Avr 2017
How can I make contour lines smoother?

Réponses (3)

Kelly Kearney
Kelly Kearney le 20 Juin 2013
The easiest way to do this is to interpolate your data to a higher resolution using an interpolation scheme that will result in smoother transitions between points, such as a spline.
[x,y,z] = peaks(10);
[xnew, ynew] = meshgrid(linspace(-3,3,100));
znew = interp2(x,y,z,xnew,ynew, 'spline');
subplot(2,1,1);
hold on;
scatter(x(:), y(:), [], z(:), 'filled');
contour(x,y,z, -6:7);
subplot(2,1,2);
hold on;
scatter(x(:), y(:), [], z(:), 'filled');
contour(xnew, ynew, znew, -6:7);
Be careful with this, though, since it might introduce some artifacts. Even though it may not be as visually pleasing, the low-res, less-smooth version is a more accurate depiction of the underlying data.
  1 commentaire
Konstantin
Konstantin le 3 Avr 2017
Thanks. Very useful example.

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Andrew Reibold
Andrew Reibold le 14 Juin 2013
Is it something you can try "binning"?
  1 commentaire
Sandy
Sandy le 17 Juin 2013
Modifié(e) : Sandy le 17 Juin 2013
Well the data has already been binned (hist3()).

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Image Analyst
Image Analyst le 20 Juin 2013
Please post an image or screenshot. For example, one way could be to blur your image with conv2() or imfilter() before you call contour().

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