How to smooth the edges

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Younes Nejahi 2016-2-17

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评论： Francesco Pignatelli 2022-7-26

采纳的回答： Image Analyst

Here is the original picture

I have and I need to smooth edges and get something more like this.

I tried many methods but neither gives me a smooth shape like this.

Anyone else have any idea how to approach this kind of problem?

Thanks in advance.

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Image Analyst 2016-2-17

Huh? Your "this" looks way more craggy and jagged and tortuous than the "original picture". Did you reverse them?

Younes Nejahi 2016-2-18

Yes, sorry I didn't realize I messed it up. I've fixed the images.

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Image Analyst 2016-2-17

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编辑：Image Analyst 2016-2-17

Assuming you reverses your original and output images, I'd start with the one with craggy arms and do an morphological opening on it with imopen(). then, if it's still not smooth enough and you know what you want one smooth curve from top to bottom, I'd use find() to get the edge column and use conv() or sgolayfilt() to smooth the edge to a nice slowly varying curve. Or you could use polyfit() if you want a global curve rather than a locally varying one.

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Image Analyst 2022-7-26

@Francesco Pignatelli the "other issue" should be discussed in a new discussion thread, not here in @Younes Nejahi's question. Attach your original image there (not here) and code for getting the edges. Chances are, you got the edges incorrectly (like using edge function instead of the bwboundary function).

Francesco Pignatelli 2022-7-26

@Image Analyst you are right. I made a new question:

https://se.mathworks.com/matlabcentral/answers/1767990-make-a-continuous-line-from-an-edge

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Brattv 2016-2-17

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Hi,

Did you try to convert to gray and use imgaussfilt?

G = imread('YourImage.png');
grayIm = rgb2gray(G);
test = imgaussfilt(grayIm,4);
imshow(test)

The last parameter in imgaussfilt is the standard deviation. The higher the more blurred.

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Younes Nejahi 2016-2-18

Thanks for your response, but I meant the other way. I reversed the pictures.

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