How can I make contour lines smoother?
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How can I make contour lines smoother?
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Answers (3)
Kelly Kearney
on 20 Jun 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.
Image Analyst
on 20 Jun 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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