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
Full Article | PDF ArticleMore Like This
Dan Cojoc, M. Teresa Molina, Javier García, and Carlos Ferreira
Appl. Opt. 36(20) 4812-4815 (1997)
David Casasent, Shao-Feng Xia, Andrew J. Lee, and Jian-Zhong Song
Appl. Opt. 26(5) 938-942 (1987)
David Mendlovic, Naim Konforti, and Emanuel Marom
Appl. Opt. 28(23) 4982-4986 (1989)