4pcs registration method ...

...as proposed by Aiger et al. (2007, 4-Points Congruent Sets for Robust Surface Registration) and Theiler et al. (2014, Keypoint-based 4-Points Congruent Sets – Automated marker-less registration of laser scans).

Commit is together with a fast transformation estimation method to speed up the calculation using a minimum number of 3 points. This method simplifies the calculation of transformation parameters when dealing with a 3 point planar case.

I do realize, that a comparable contribution (fpcs by stheg) was done in June 2014, but since the additional method k-4pcs is inheriting a lot from its parent 4pcs, this commitment is only useful in combination.
Our contributing guide allows to add universities/organizations of the authors to the copyright as long as Open Perception is also present. So I guess what you want to do is fine.

Personally, I think that the copyright section is for legal stuff. If you want to properly acknowledge the authors, you better mention them in the doxygen comments (this is what most people will read, not the copyrights). But this is just my understanding, I am not a lawyer or anything.