Ensemble Kalman Filter and 4D-Var Intercomparison with

filter4dModeling the Imaging System#. We’ll model two different imaging systems here: an idealized imaging system, and a true SPECT imaging system. We’ll show that filtered back projectionFILTER THROUGH SOMETHING definition: 1. to appear or happen gradually or to a limited degree through something: 2. to appear or happen…. Learn more.