title: Three filters for visualization of phase objects with large variations of phase gradients.
abstract: We propose three amplitude filters for visualization of phase objects. They interact with the spectra of pure-phase objects in the frequency plane and are based on tangent and error functions as well as antisymmetric combination of square roots. The error function is a normalized form of the Gaussian function. The antisymmetric square-root filter is composed of two square-root filters to widen its spatial frequency spectral range. Their advantage over other known amplitude frequency-domain filters, such as linear or square-root graded ones, is that they allow high-contrast visualization of objects with large variations of phase gradients.
authors.affiliation: Faculty of Physics, University of Warsaw, Warsaw Poland. asagan@igf.fuw.edu.pl
authors.forename: Arkadiusz
authors.initials: A
authors.lastname: Sagan
authors.forename: Tomasz J
authors.initials: TJ
authors.lastname: Antosiewicz
authors.forename: Tomasz
authors.initials: T
authors.lastname: Szoplik