How to create a mask to segment a color image by activecontour?

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Braiki Marwa
Braiki Marwa 2018-8-7
Hello,
I want to use the function activecontour in matlab to segment a color image buti don't know how to create the mask ("For color and multi-channel images, mask must be a 2-D logical array where the first two dimensions match the first two dimensions of the image A").

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