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How to extract boundary of binary image in a fixed sequence ?

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Yihan Ma
Yihan Ma le 10 Déc 2019
If I have a binary image like this, how to extract boundary in a certain order. For instance, I can extract boundary from left to right side, or from top to bottom side ?
When I use boundaries function, it gives me disordered sequences ? I really confused about how to solve this problem.
Testx.png

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