Image quality improvement of digital holography by superposition of reconstructed images obtained by multiple wavelengths

Abstract. Digital holography is an emerging field of new paradigm in general imaging applications. We present a review of a subset of the research and development activities in digital holography, with emphasis on microscopy techniques and applications. First, the basic results from the general theory of holography, based on the scalar diffraction theory, are summarized, and a general description of the digital holographic microscopy process is given, including quantitative phase microscopy. Several numerical diffraction methods are described and compared, and a number of representative configurations used in digital holography are described, including off-axis Fresnel, Fourier, image plane, in-line, Gabor, and phase-shifting digital holographies. Then we survey numerical techniques that give rise to unique capabilities of digital holography, including suppression of dc and twin image terms, pixel resolution control, optical phase unwrapping, aberration compensation, and others. A survey is also given of representative application areas, including biomedical microscopy, particle field holography, micrometrology, and holographic tomography, as well as some of the special techniques, such as holography of total internal reflection, optical scanning holography, digital interference holography, and heterodyne holography. The review is intended for students and new researchers interested in developing new techniques and exploring new applications of digital holography. C 2010 Society of Photo-Optical Instrumentation Engineers.

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“…In Ref. 209, several holograms using different wavelengths are superposed to observe the reduction in speckle noise.…”

Section: Low-coherence Holographymentioning

confidence: 99%

Principles and techniques of digital holographic microscopy

2010

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“…Let g(x 0 , y 0 ) denote a complex field of an object wave at the object plane (x 0 , y 0 ).Atadistance of d from an object, the complex field is given by (Nomura et al, 2008) …”

Section: Speckle Size In Digital Holographymentioning

confidence: 99%

Image Quality Improvement of Digital Holography by Multiple Wavelengths or Multiple Holograms

Nomura¹

2011

Holography, Research and Technologies

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“…Also in 2006, Baumbach et al [18] added together reconstructions from laterally shifted holograms of an object to reduce the speckle content. Nomura et al [19] proposed reducing speckle in reconstructions of DHs by superposing reconstructed DHs recorded at different wavelengths. Using a wavelengthtunable laser, they added together reconstructions from each of the captured DHs on an intensity basis, thus reducing the speckle content.…”

Section: Introductionmentioning

confidence: 99%

“…Speckle is suppressed by adding together reconstructions from these DHs on an intensity basis. Nomura et al [19] proposed a different method of reducing speckle by superposing the intensities of reconstructed DHs recorded at different wavelengths. They used a wavelength-tunable laser and they captured their DHs in the range 567 nm to 624 nm, with an interval of 8 nm.…”

Section: Introductionmentioning

confidence: 99%

Speckle reduction of reconstructions of digital holograms using three dimensional filtering

Maycock

McDonald

Hennelly

2013

Optics Communications

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We report on a new digital signal processing technique that reduces speckle in reconstructions of digital holograms. This is achieved by convolving the three dimensional intensity pattern (the intensity of the propagated DH at a series of different distances) with a 3D point spread function in all three dimensions (x,y,z ). It is based on the fact that the addition of different independent speckle images on an intensity basis reduces the speckle content. We provide quantitative results in terms of speckle index and resolution, and show that filtering in the z direction has the added benefit of an increase the depth of focus of the digital hologram reconstruction.

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Image quality improvement of digital holography by superposition of reconstructed images obtained by multiple wavelengths

Cited by 106 publications

References 17 publications

Principles and techniques of digital holographic microscopy

Principles and techniques of digital holographic microscopy

Image Quality Improvement of Digital Holography by Multiple Wavelengths or Multiple Holograms

Speckle reduction of reconstructions of digital holograms using three dimensional filtering

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