Application of Complex Filter in Digital Hologram Processing
Chen Jin-biao, Yong Li · Optics & Optoelectronic Technology · 2009
The digital hologram has widespread application prospect in the measurements of objects with small aperture and small field of view,such as examination of micro electric circuit,analysis of granularity,measurement of transparent field and the cell observation.A complex filter is proposed to process digital hologram with computer and corresponding algorithm, according to the frequency spectrum characteristics of the off-axis digital hologram.With this method,the zero order and twin image of hologram can be eliminated and the phase distribution of hologram can be obtained at the same time.This method facilitates the compression and reconstruction of digital hologram,and the manufacture of kinoform.The design of complex filter is discussed in this paper and the experimental results are presented as well.