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Connect pixels to form the boundary of an object

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TY
TY 2016-9-17
评论： Kimo Kalip 2018-7-3
Hi,
I want to connect disjoint pixels to form the boundary of the object. What are the necessary commands/procedures to do so?
It is quite urgent. Thanks so much if anyone can answer it.

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回答（1 个）

Image Analyst
Image Analyst 2016-9-17
You can use activecontour(), demo attached.
Or you can use edge linking. http://www.peterkovesi.com/matlabfns/#edgelink
Or maybe convhull(), bwconvhull(), contour(), bwboundaries(), bwperim(), etc. depending on what your image looks like.
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Image Analyst
Image Analyst 2016-9-18
You might try normalized cross correlation, done by normxcorr2(). See attached demo.
Kimo Kalip
Kimo Kalip 2018-7-3
Two questions:
  1. Is this a literal recognition, where given the photo at subplot (2,2,2) will only recognize in that particular orientation in this particular image, or could you rotate the onion, or have two such onions in the photo and you'd still get matches?
  2. How exactly does normalizing the original image work for you in subplot (2,2,3)? Like I don't understand how it tells you where the onion is.

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