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Blurring non-rectangular region of an image, then downsample whole image

Hello,

I am using OpenCV3 to blur and downsample an image, I just want to blur the region inside the area defined by a binary mask like:

enter image description here

After that region is blurred, I would like to downsample the image without blurring the whole image again, so pyrDown is not useful for me.

Any idea?