I am running the AKAZE feature detector (python) on an extremely large image, and I want to tile the image. In order to actually get the features on the entire image, I want to overlap the tiles with enough pixels to cover half the patch size, but in order to avoid getting redundant points, I want the overlap to be half the patch width.
I see experimentally that the default descriptor size is 61. I also see experimentally that I am not getting any keypoints within 28 pixels of the edge of the image. However, I don't fully understand the details of the descriptor, and so I don't know how to translate that into the default dimensions of the patch.
How can I find the default width of the patch in pixels?