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The only thing to be wary of is that with a limited number of keypoints detected, it might not find very many in some areas of the image. If you crop it to just that area, then it will find the specified number of keypoints.
You can probably check each bounding box to see if there are enough points, and then lower your threshold/up the number of points until you get enough.
The actual keypoints will have the same descriptors and such though, so no problem there.
