I have a 4-channel image (.png, .tif) like this one:
And I would like to add padding of type
BORDER_REFLECT around the flower.
copyMakeBorder is not useful, since it adds padding to the edges of the image.
I can add certain padding if I split the image in bgr + alpha and apply
BORDER_REFLECT option on the bgr image, but that solution spoils all the pixels of the flower.
Is there any way to perform a selective
BORDER_REFLECT padding addition on a ROI defined by a binary mask?