Morphological phase-only correlation

We propose a modified version of morphological correlation (MC), morphological phase-only correlation (MPC), by replacing the JTC operation with phase-only filtering in the common MC implementation. The performance of MPC with noise-corrupted input scene and unknown input-scene illumination are investigated and compared with those of MC and linear correlation (LC). Simulation results show that MPC provides higher discriminability, sharper and higher correlation peaks, and better robustness in the presence of salt-and-pepper noise. MPC loses the illumination-invariant recognition of MC when input scene is brighter than reference, however its high DR is still ensured within a considerable range of illumination. (C) 2004 Elsevier B.V. All rights reserved.