What can be safely assumed, when authors of a research article do not say/mention/hint anything about how they dealt with neighborhood operations close to image border? 

My question may seem naive as some options are mentioned on <https://en.wikipedia.org/wiki/Neighborhood_operation>.

I am replicating a work reported in a journal article, where a 300x300 neighborhood around the current\_point is used for computations. The authors did not mention how they dealt with border cases.