Track the edge of a blob

Question

KuroWings 2021-11-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1577855-track-the-edge-of-a-blob

评论： KuroWings 2021-11-9

采纳的回答： Image Analyst

Sequence.zip

Hello everyone!!.

I have the following problem, where I need to track these 2 blobs

the point is that it is an iterative and extremely variable problem.

SO

things like this could happen (when it could lose blob 1, losing a little but not all of its contour)

So I'm looking for a tracking method that doesn't rely on detecting specific objects.

If I could track edges that would be awesome.

Here is an example of 2 consecutive images

here is the view of the whole blob in its step 1 and 2

In other words, I only need to recognize when these 2 blobs (borders) are "inside" the large border.

specifically when the boundary between them is broken

if someone could give me some guidance it would be great!!!

Many thanks in advice!!!

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Answer 1

Image Analyst 2021-11-7

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https://ww2.mathworks.cn/matlabcentral/answers/1577855-track-the-edge-of-a-blob#answer_825699

Look into bwboundaries() -- it will show you what boundaries are nested inside other boundaries. Or you can use inpolygon() to determine if a point is inside a polygon.

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Image Analyst 2021-11-9

If your boundaries are broken, you can try to connect them using imclose(). Your image is of very low resolution and imclose will change the shape a little bit (of course it has to if it's going to close that gap).

Otherwise you can look at more sophisticated techniques like "edge linking".

KuroWings 2021-11-9

imclose won't work because that would close all the little blobs that are present in some cases, due to the variability of their shapes.

edge linking sounds good, I will check it out, Thank you very much!

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Answer 2

yanqi liu 2021-11-5

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sir, the zip file contains 5 png file

what is the target? such as the right seperate?

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KuroWings 2021-11-7

编辑：KuroWings 2021-11-7

Hi, the goal is to follow the inner line, even if it breaks, in order to track the blob.

the zip file is an example where in image 5, blobs 1 and 2 are separated, and i just need to recognize that without using a conventional object detector like vision.BlobAnalysis

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