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Create a mask with a roi

I have an image

Mat image; //(size: 300x300)

And I have a roi:

Rect ROI(50,50,100,100);  //(start from 50,50 and has size 100x100)

I would like to create a mask so keypoints inside of this roi don't get extracted.

//> create mask with 0s inside the ROI and 1s outside
OrbFeatureDetector.detect(image,kps,mask);

Which would be a good way to create this mask?