How can remove all regions outside roi?

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Fellows I have a image with small coin, I want maintain the coin and remove all object's around the coin, I thought maybe implementing a Roi was possible to do that someone can help me

Accepted Answer

Image Analyst
Image Analyst on 26 Jun 2015
See my attached masking demos. They show a variety of different ways you can mask an image, such as to blacken outside an ROI.

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