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How to extract contour line from my image

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Kwanghun Choi
Kwanghun Choi 2017-10-18
编辑： Kwanghun Choi 2017-10-18
'I delete picture after getting answer. Thanks for answer'
Hello! I really want big help of your intelligence.
I want to extract contour from inserted image. But I cannot delete unnecessary figures like mark, word etc. I try to do some example in matlab answers of other question, but it is not applied to my image. How can I extract contourline? please help me.

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Image Analyst
Image Analyst 2017-10-18
Why? What's the "use case"?
All I can suggest is bwselect() but your contour lines are very very broken so you may just get part of one.

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