Advanced in-plane rotation-invariant correlation filters
Ravichandran, G.; Casasent, D.
Pattern Analysis and Machine Intelligence, IEEE Transactions on
Volume 16, Issue 4, Apr 1994 Page(s):415 - 420
Digital Object Identifier   10.1109/34.277595
Summary:Advanced correlation filter synthesis algorithms to achieve rotation invariance are described. We use a specified form for the filter as the rotation invariance constraint and derive a general closed-form solution for a multiclass rotation-invariant filter that can recognize a number of different objects. By requiring the filter to minimize the average correlation plane energy, we produce a multiclass rotation invariant (RI) RI-MACE filter, which controls correlation plane sidelobes and improves discrimination against false targets. To improve noise performance, we require the filter to minimize a weighted sum of correlation plane signal and noise energy. Initial test results of all filters are provided

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