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i am new to image segmentation.i am studying chanvese ACWE paper1.This is level set equation of chan vese paper ACWE.

Above, μ,ν,λ1,λ2 are real parameters, c1,c2 are constants determined for segmentation, −1≤φ(x)≤1 is the level-set function in which φ(x)=0 specifies the interface, f is the original image, H is the heavyside function.

i just want to know how they derive the following equation of C1 , C2 and evoving phi.

enter image description here enter image description here

it will be very kind if anyone can help me or provide me the derivation of these equations . Thank you

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