Abstract: A dithered offset correction method wherein, according to a first embodiment, updates are made of the offset correction during each iteration and, after four iterations, the offset for each pixel or detector element is updated from all of its neighbors to provide faster convergence than is obtainable by the prior art. In accordance with a second embodiment, the offset for each detector element is updated for every iteration and, for each update, the update is made with information from an entire row or an entire column of data. After four iterations, each offset has been updated with information from every detector element in the focal plane array. This provides even more rapid convergence compared to the prior art.