Boundary smoothing in a shape optimization result using NURBS Toolbox (actually, if you have another suggestion please tell me)

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Felipe vielmo 2017-9-19

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评论： Sharath Chandra Garla Venkatakrishnaiah 2020-8-3

Hello everyone! I am trying to smooth a boundary of a image, which is the result of a shape optimization like the image below

the routine is that: using BWboundaries function I select every contour between black and white then delete the coordinates that didn't changes the direction in x and y at the same time. So when I try to use the function nrbplot (NURBS Toolbox) to do the actually smoothing part of the process, the results doesn't go as expected. Can someone point me the correct direction to solve my problem?

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Image Analyst 2017-9-19

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Either blur the image and then threshold it, or increase the size of the image and interpolate it or blur and threshold.

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Image Analyst 2020-7-29

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No idea on CAD, but to get a smoothed binary image, assuming you have the resolution, you can blur it and then threshold again to get a logical image again.

windowSize = 5; % Whatever, more for a smoother blur and shape.  Odd number starting with 3.
kernel = ones(windowSize);
kernel = kernel / windowSize^2;
blurredImage = imfilter(double(binaryImage), kernel);
binaryImage = blurredImage < 0.5;