1. A method comprising: computing, by a computer comprising a processor, a transfer matrix representing a relative influence that each of the respective electrode locations for the measured electrical potentials has on the estimation of electrical potentials for the locations on the surface of interest prior to measuring the plurality of electrical potentials; measuring the plurality of electrical potentials via the plurality of electrodes at respective electrode locations on a patient's body; receiving, by the computer, data corresponding to the plurality of electrical potentials measured via the plurality of electrodes at respective electrode locations; and computing, by the computer, an estimation of electrical potentials for locations on a surface of interest based at least in part on the measured plurality of electrical potentials and the computed transfer matrix, wherein the locations on the surface of interest are different from the electrode locations; and displaying an image of the surface of interest including the estimated electrical potentials for locations on the surface of interest.