An imaging algorithm for vertex reconstruction for ATLAS Run-2

The reconstruction of vertices corresponding to proton--proton collisions in ATLAS is an essential element of event reconstruction used in many performance studies and physics analyses. During Run-1 of the LHC, ATLAS has employed an iterative approach to vertex finding. In order to improve the flexibility of the algorithm and ensure continued performance for very high numbers of simultaneous collisions in future LHC data taking, a new approach to seeding vertex finding is being developed inspired by image reconstruction techniques. This note provides a brief outline of how reconstructed tracks are used to create an image of likely vertex collisions in an event and presents some preliminary results of the performance of the algorithm in simulation approximating early Run-2 conditions.