Abstract
A shift-and-scale-invariant elliptic coordinate-transformed phase-only filter in proposed. The filter is built in three steps: the complex conjugate of a basic-size target spectrum is calculated, its phase-only part is taken, and then the elliptic coordinate transformation is made. In the extreme case the scale ratio of recognizable objects equals 1:1.5, permitting good recognition of object sizes S within the range 0.83 ≤ S ≤ 1.25. Discrimination abilities and relative Horner efficiencies of a few versions of the filter are calculated.
© 1992 Optical Society of America
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