Abstract
This Letter presents a novel approach to enhance the fringe contrast (visibility)
in a digital off-axis hologram digitally, which can save several adjustment procedures.
In the approach, we train a pair of coupled dictionaries from a low fringe contrast
hologram and a high one of the same specimen, use the dictionaries to sparse code the
input hologram, and finally output a higher fringe contrast hologram. The sparse
representation shows good adaptability on holograms. The experimental results
demonstrate the benefit of low noise in a three-dimensional profile and prove the
effectiveness of the approach.
© 2016 Chinese Laser Press
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