Optimal synthetic aperture radar image correlation using enhanced scattering centers in holographic data storage

We prove that for gray-level or binarized synthetic aperture radar (SAR) im ages with enhanced scattering centers, the DC-blocked phase-only filter is the optimal, as well as the most practical, solution for SAR image recognit ion. Our correlation algorithm, which employs various power laws to enhance the scattering centers, was examined for images with different complexity using the moving and stationary target acquisitions and recognition (MSTAR) data base. For standard recognition problems, which represent 95% of the c ases (intermediate level of noise and sufficient number of scattering cente rs on the target), we found that our proposed approach improves the correla tion even when utilizing binary templates extracted from the region of inte rest and binary inputs. For more complex problems (representing nearly 5% o f the cases), a further improvement in our correlation recognition approach is needed. (C) 2001 Society of Photo-Optical Instrumentation Engineers.