How to smooth edges of polygons?

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m975
m975 il 12 Ott 2017
Commentato: m975 il 19 Ott 2017
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!

Risposte (2)

Andrew Chen
Andrew Chen il 12 Ott 2017
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!
  3 Commenti
Andrew Chen
Andrew Chen il 13 Ott 2017
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
m975 il 13 Ott 2017
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
Image Analyst il 13 Ott 2017
You can smooth the edges with a filter. See attached.
  8 Commenti
m975
m975 il 13 Ott 2017
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
m975 il 19 Ott 2017
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!

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