Abstract
Zero-order and twin images are a serious obstacle in achieving a high-quality
output in in-line digital holography (DH). They decrease the useful bandwidth of the
off-axis DH. Over the years the twin image removal problem was approached both by
instrumental and numerical means. The paper provides an extended survey of the
proposed solutions with their pros and cons as a guide for further advance in this
field. Processing of a single spatial carrier fringe pattern involves spatial
filtering in the frequency domain, spatial phase-shifting (PS) or wavelet transform.
A point source digital holographic microscopy (DHM), introduction of calibration
measurements or various modifications of PS technique are instrumental solutions to
the twin image problem for in-line DH. Numerical solutions to the same problem
include iterative and non-iterative approaches, diffraction-based and inverse
problem solutions, reconstruction of purely real or phase objects and of complex
objects, reconstruction of plane and volume objects. Elimination only of the
zero-order image relies on non-linear filtering or additional calibration
measurements.
© 2014 Chinese Optics Letters
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