How to smooth edges of polygons?

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m975 2017-10-12

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https://ww2.mathworks.cn/matlabcentral/answers/360998-how-to-smooth-edges-of-polygons

评论： m975 2017-10-19

I created a image (uint8) with multiple filled polygons. First, I used the vision.ShapeInserter with 'Antialiasing' but this was not enough. Also insertShape + 'SmoothEdges' produced insufficient smooth edges. Are there any other ways how I can fix that?

Looking forward to your suggestions. Thanks!

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回答（2 个）

Andrew Chen 2017-10-12

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在 MATLAB Online 中打开

Perhaps imopen with a disk structuring element will provide the functionality you are looking for?

Ex:

se = strel('disk',5);
new_img = imopen(original_image,se);

Hope this helps!

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Andrew Chen 2017-10-13

Did Image Analyst's answer get you what you wanted? Otherwise, maybe you could clarify what you mean by "smooth edges". What in your mind constitutes a sufficiently smooth edge?

m975 2017-10-13

For example, in this image polygons show proper edges without these awful "stairs" when the shapes get rotated. By the way, this image was drawn in photoshop. But now I have to create a lot of stimuli in MATLAB by using coordinates for my polygons. Consequently, I am looking for a MATLAB routine to generate images of same quality. I hope this explanation helps. Thanks!

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Image Analyst 2017-10-13

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savitzky_golay_filter_smooth_outline.m

You can smooth the edges with a filter. See attached.

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m975 2017-10-13

在 MATLAB Online 中打开

I processed the image as follows but it did not work.

level = graythresh(I);
BW = im2bw(I, level);

You can still see these toothed edges:

m975 2017-10-19

Finally, the easiest workaround was to create very big images (5000 x 5000 px) and, subsequently, resize them to the favored stimulus size. Now edges look sexy again!