Find closed loop after using bwboundaries

First, I'm sorry for my English. And my problem is I have use bwboundaries and receive matrix B. Now I want to find all boundaries in B that every dots have at least 2 neighbours (that I think is a closed loop). Can you show me the way to do so?

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提问:

2017-12-18

编辑:

2017-12-18

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