How could I convert this henna tattoo to black and white?

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I'm trying to extract the henna tattoo pattern from the image and have tried applying a median filter (despeckle) and detecting the tattoo with Difference of Gaussians, but the detail I get is always way below what seems possible by looking at the image. I could also try tackling this problem with MathMap if I knew a good algorithm. Henna tattoo

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