Phase-only circular harmonic filters and binary phase-only circular harmonic filters are proposed. Both filters have full rotation invariance and excellent performance for discrimination between objects and against background noise. Their properties have been studied and implemented for computer applications. The binary filters are appropriate for real-time applications using spatial light modulators.
© 1989 Optical Society of America
Luc Leclerc, Yunlong Sheng, and Henri H. Arsenault, "Rotation invariant phase-only and binary phase-only correlation," Appl. Opt. 28, 1251-1256 (1989)