Numerical reconstruction and twin-image suppression using an off-axis Fresnel digital hologram

Chen, G.L.; Lin, Ching-Yang; Kuo, Ming-Kuei; Chang, Chi Ching

doi:10.1007/s00340-007-2910-5

Cited by 20 publications

(7 citation statements)

References 16 publications

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“…where k and k are the two components of the wave number k, and hðzÞ represents the impulse response through the distance z. Note that k and k can be expressed as 12) k…”

Section: Working Principlementioning

confidence: 99%

“…5) To eliminate zero-order and conjugate images, a spatial filtering method was proposed by Cuche et al, 6) the phase-shifting method was proposed by Yamaguchi and Zhang 7) and arbitrary DH phase steps were proposed by many researchers. [8][9][10][11] Recently, our group 12) has used a single off-axis digital hologram and introduced an additional reconstruction plane so that zero-order, object, and conjugate images can be well separated after numerical reconstruction.…”

Section: Introductionmentioning

confidence: 99%

“…2,13) The reconstructed amplitude and phase distributions of the object wavefront will still include a quadratic phase term, the so-called defocus aberration, produced by an MO. In this work, we will use a spatial filtering algorithm 12) with a confocal scheme to experimentally compensate for defocus aberration and numerically improve the reconstructed magnitude and phase-contrast images that use only a single off-axis digital hologram. This simple and effective approach can be used to inspect micro-devices with DHM.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Confocal Scheme to Compensate for Defocus Aberration in Digital Holographic Microscopy

Chang

Hsieh

Chen

et al. 2009

Jpn. J. Appl. Phys.

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By means of two typical sets of nuclear parton distribution functions, meanwhile taking account of the energy loss of the beam proton and the nuclear absorption of the charmonium states traversing the nuclear matter in the uniform framework of the Glauber model, a leading order phenomenological analysis is given in the color evaporation model of the E866 experimental data on J/ψ production differential cross section ratios R Fe/Be (xF). It is shown that the energy loss effect of beam proton on R Fe/Be (xF) is more important than the nuclear effects on parton distribution functions in the high Feynman variable xF region. It is found that the J/ψ-nucleon inelastic cross section depends on the Feynman variable xF and increases linearly with xF in the region xF > 0.2.No. 9 DUAN Chun-Gui et al: The dependence of J/ψ-nucleon inelastic cross section on the Feynman variable 805

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“…where k and k are the two components of the wave number k, and hðzÞ represents the impulse response through the distance z. Note that k and k can be expressed as 12) k…”

Section: Working Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Confocal Scheme to Compensate for Defocus Aberration in Digital Holographic Microscopy

Chang

Hsieh

Chen

et al. 2009

Jpn. J. Appl. Phys.

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show abstract

“…Off-axis digital Fresnel holography is an important branch of DH. 42,43) The digital hologram can be acquired via interference of a reference wave and an object wave at a certain angle. When the object wave distribution on the holographic recording plane (the position of the CCD or CMOS plane) can be described by the Fresnel diffraction formula, the Fresnel hologram can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Autofocusing in off-axis digital Fresnel holography using S-th power weighted neighborhood correlation coefficient

Zhang,

Song,

Qiu

2023

Jpn. J. Appl. Phys.

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Accurately determining the focus plane of the reconstructed image is crucial for obtaining high-quality reconstructed images in the process of digital hologram reconstruction. In this paper, a focusing evaluation function based on S-th power weighted neighborhood correlation coefficient (SPWNCC) is proposed to realize automatic focusing of the reconstructed image in off-axis digital Fresnel holography. The Fresnel transform method is utilized as the off-axis digital holographic reconstruction algorithm. Both the numerical simulation and optical experiment results are given to verify the validity of the proposed autofocusing method. The obtained focusing curve can maintain good unimodality and noise immunity performance over a large search range (approximately 800 mm). The proposed SPWNCC based focusing evaluation function has a certain guiding significance on the automatic focusing of off axis digital holographic reconstructed images of long distance recorded objects.

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“…Optical digital holography applications are manifold and include biological microscopy [2][3][4][5][6][7], metrology of microstructures [8][9][10], and deformation and vibration analysis [11][12][13]. Previously identified advantages of optical wavelength off-axis digital holography over in-line holography include the separation of amplitude and phase information [14], noise reduction [15], and object focusing [16], as well as the ability to quantify optical thickness and refractive index variations of an object with sub-wavelength accuracy [17].…”

Section: Introductionmentioning

confidence: 99%

Terahertz digital holography using angular spectrum and dual wavelength reconstruction methods

Heimbeck¹,

Kim²,

Gregory³

et al. 2011

Opt. Express

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Terahertz digital off-axis holography is demonstrated using a Mach-Zehnder interferometer with a highly coherent, frequency tunable, continuous wave terahertz source emitting around 0.7 THz and a single, spatially-scanned Schottky diode detector. The reconstruction of amplitude and phase objects is performed digitally using the angular spectrum method in conjunction with Fourier space filtering to reduce noise from the twin image and DC term. Phase unwrapping is achieved using the dual wavelength method, which offers an automated approach to overcome the 2π phase ambiguity. Potential applications for nondestructive test and evaluation of visually opaque dielectric and composite objects are discussed.

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Numerical reconstruction and twin-image suppression using an off-axis Fresnel digital hologram

Cited by 20 publications

References 16 publications

Confocal Scheme to Compensate for Defocus Aberration in Digital Holographic Microscopy

Confocal Scheme to Compensate for Defocus Aberration in Digital Holographic Microscopy

Autofocusing in off-axis digital Fresnel holography using S-th power weighted neighborhood correlation coefficient

Terahertz digital holography using angular spectrum and dual wavelength reconstruction methods

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