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.
© 2009 Optical Society of America
Full Article | PDF ArticleMore Like This
Arkadiusz Sagan, Slawomir Nowicki, Ryszard Buczynski, Marek Kowalczyk, and Tomasz Szoplik
Appl. Opt. 42(29) 5816-5824 (2003)
Robert A. Sprague and Brian J. Thompson
Appl. Opt. 11(7) 1469-1479 (1972)
Tomasz Szoplik, Vicent Climent, Enrique Tajahuerce, Jesús Lancis, and Mercedes Fernández-Alonso
Appl. Opt. 37(23) 5472-5478 (1998)