The influence of hologram aperture on speckle noise in the reconstructed image of digital holography and its reduction

Based on the whole process of the recording and reconstruction of digital holography, we study the formation cause of speckle noise in its reconstructed image and acquire the conclusion that the small size of hologram aperture diffraction aggravates the speckle noise of reconstructed image and the s...

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Bibliographic Details
Published in:Optics communications 2008-01, Vol.281 (2), p.232-237
Main Authors: Cai, Xiao-ou, Wang, Hui
Format: Article
Language:English
Subjects:
Deconvolution process
Digital holography
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Hologram aperture
Hologram recording and read-out methods
Holography
Image reconstruction
tomography
Imaging and optical processing
Optics
Physics
Speckle and moire patterns
Speckle noise
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Summary:Based on the whole process of the recording and reconstruction of digital holography, we study the formation cause of speckle noise in its reconstructed image and acquire the conclusion that the small size of hologram aperture diffraction aggravates the speckle noise of reconstructed image and the speckle noise has been one of primary noise sources in the reconstruction process. In order to reduce the speckle noise resulting from little hologram aperture diffraction, we set an appropriate aperture function matching the recording parameter and aperture size of hologram and deconvolve the reconstructed image with it. The validity has been proved in theory and experiment. Therefore, it offers a brand-new thought and practical way to reduce the speckle noise in the reconstructed image of digital holography.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2007.09.030