How To Smooth The Image Edge

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behnam emami 2015-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/219803-how-to-smooth-the-image-edge

评论： Harshan Desu 2020-5-1

采纳的回答： Salaheddin Hosseinzadeh

>>i use : image=imread('hand.png'); e=edge(image,'canny'); imshow(e);

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Salaheddin Hosseinzadeh 2015-5-27

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编辑：Salaheddin Hosseinzadeh 2015-5-27

Salam Behnam!

I guess by smoothing you mean getting rid of the jagged edges.

What do you think of performing a dilation with a huge radial element and then perform thining?

I just did this here is the result

I hope this is good enough. I did it with a disk of 10 pixels radious you maybe reduce/increase the disk size and get a better smoothing.

Good Luck!

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Salaheddin Hosseinzadeh 2015-5-27

编辑：Salaheddin Hosseinzadeh 2015-5-27

在 MATLAB Online 中打开

Dear Behnam,

You can search MATLAB help for the keywords in my answer. Please also have a look at Image Analyst response, that is far more scientific.

dilatedImage = imdilate(image,strel('disk',10));
thinedImage = bwmorph(dilatedImage,'thin',inf);

Good luck!

behnam emami 2015-5-27

Thank You Mr Salaheddin Hosseinzadeh

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Image Analyst 2015-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/219803-how-to-smooth-the-image-edge#answer_180730

编辑：Image Analyst 2016-1-27

savitzky_golay_filter_smooth_outline.m

One way is to blur the image with imfilter() or conv2() before you do the edge detection. Another way is to smooth the outline coordinates with a Savitzky-Golay filter, sgolayfilt() in the Signal Processing Toolbox.

See demo and image in the comment below - tell it to show the older comments because it's collapsed now.

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Image Analyst 2020-4-9

I don't know the resolution. Maybe those jaggies are just one pixel big? If so, you'd have to increase the number of pixels then blur and threshold.

Harshan Desu 2020-5-1

I have tired working on it for the past two weeks sir, I couldnt still get what I want. Let me explain my project clearly.. Please suggest me how I can work on it.

Project: Finding the edges of a door and used those edges as a trajectory for a sensor that checks edges for Gap/Flush.

Problem: I used Savitzky Golay, Edge Linking and Line Segment Fitting from your blog:

(https://www.peterkovesi.com/matlabfns/#step2line). After all this I am not able to get good edges, its either not smooth or has a lot of unnecessary edges.

Method I used: Image Analyst's Savitzky filter smoothening at three diffrent thresholds, obtain three images and blend them. The output is again processed to Edge linking and line segmenting program which I got from ur blog.

Questions: