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I have an image. I used Canny edge detector,and then I apply Sift on it.

Here the result :

enter image description here

I don't understand the result. Why have i some interest points on some black areas and not a lot where I expect the more ? Besides, what does the circle size refer to ?

I took a look on the internet but it's not totally clear and I don't find any information about it.

Can anyone explain?

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