close lines after edge detection

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Elad 2012-5-28

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评论： Stelios Fanourakis 2019-8-21

Hi all, After edge detection and adding some circular object, I like to close the lines and fill each area. this is an example : http://i48.tinypic.com/35hq0cg.jpg

is there a way to close the lines without dilation or morfological operations? those would modify the accuracy of the detection.

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Stephen 2012-5-29

what was the original image?

Elad 2012-5-30

Its fungi on a leaf , but this image is after a few manipulations allready.

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回答（2 个）

Image Analyst 2012-5-28

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You can try edge linking: http://www.csse.uwa.edu.au/~pk/Research/MatlabFns/#edgelink

Other options would be convex hull or restricted convex hull, or Sean's shrink wrap: http://www.mathworks.com/matlabcentral/fileexchange/29175-shrinkwrap

Using a convex hull may not always be a good choice - it won't give the right shape in some situations. For a banana shape, it convex hull would give a D-shape. One must really look at the image and not just make blanket generalizations.

Stelios Fanourakis 2019-8-21

Image Analyst. I want to apply convex hull to a closed contour shape. Thus, the convex hull shape is more or less defined when applied to a closed contour. Isn't it?

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Walter Roberson 2012-5-28

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https://ww2.mathworks.cn/matlabcentral/answers/39600-close-lines-after-edge-detection#answer_49240

在 MATLAB Online 中打开

imfill( YourBWArray, 'holes' )

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Walter Roberson 2012-5-28

The example where the line leaves a gap: where should it attach to the main body? If the "accuracy of the detection" is an issue, every choice is wrong, unless there is external information available.

Elad 2012-5-29