Resolution-enhanced digital in-line holography by extension of the computational bandwidth

Zhang, Wenhui; Zhang, Hao; Jin, Guofan

doi:10.1016/j.optcom.2020.126038

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…Many applications necessitate a wide field of view to visualize and analyze larger areas in a scanning process while maintaining the resolution of the reconstructed information [12]. Several methodologies have been suggested to enhance resolution and broaden the field of view within digital holography, some of these approaches are synthetic wavelength holography [13], multiple-angle illumination [14], spectrum multiplexing based on retro-reflector [15], image stitching approach [16], by the effectiveness of numerical aperture [17].…”

Section: Introductionmentioning

confidence: 99%

Enhanced wide-field off-axis holography based on intensity correlation

Yadav,

Sheoran,

Suzuki

et al. 2024

Three-Dimensional Imaging, Visualization, and Display 2024

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We present an off-axis holography with intensity correlation of the randomly scattered light and initial experimental results are presented. The hologram is recorded in the intensity correlations rather than the intensity and subsequently numerical reconstruction is applied to reconstruct the complex fields encoded into the hologram. Performance of this technique is examined in the off-axis hologram recording from the intensity correlation of the laser speckles and results in better reconstruction quality and field of view. This technique may find applications in wide-field imaging and microscopy with randomness.

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Section: Introductionmentioning

confidence: 99%

Enhanced wide-field off-axis holography based on intensity correlation

Yadav,

Sheoran,

Suzuki

et al. 2024

Three-Dimensional Imaging, Visualization, and Display 2024

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show abstract

“…Resolution in a digital holographic setup is influenced by factors such as; the numerical aperture, detector pitch, and diffraction. In the past, various techniques have been proposed to improve the resolution in the DH, and some of these techniques are lowering the wavelength 21 , down-sampling the detector pitch 22 , increasing the effective numerical aperture 23 , 24 , expanding computational bandwidth 25 . Recently, some advancements have been made to develop high SBP imaging using spatial light modulator 26 , Kramers-Kronig relation 27 , 28 , and off-axis digital holographic multiplexing 29 .…”

Section: Introductionmentioning

confidence: 99%

Randomness assisted in-line holography with deep learning

Manisha

Mandal

Rathor

et al. 2023

Sci Rep

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We propose and demonstrate a holographic imaging scheme exploiting random illuminations for recording hologram and then applying numerical reconstruction and twin image removal. We use an in-line holographic geometry to record the hologram in terms of the second-order correlation and apply the numerical approach to reconstruct the recorded hologram. This strategy helps to reconstruct high-quality quantitative images in comparison to the conventional holography where the hologram is recorded in the intensity rather than the second-order intensity correlation. The twin image issue of the in-line holographic scheme is resolved by an unsupervised deep learning based method using an auto-encoder scheme. Proposed learning technique leverages the main characteristic of autoencoders to perform blind single-shot hologram reconstruction, and this does not require a dataset of samples with available ground truth for training and can reconstruct the hologram solely from the captured sample. Experimental results are presented for two objects, and a comparison of the reconstruction quality is given between the conventional inline holography and the one obtained with the proposed technique.

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Frequency sampling strategy for numerical diffraction calculations

Zhang

Jin

2020

Opt. Express

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Diffraction calculations play an essential role in Fourier optics and computational imaging. Conventional methods only consider the calculation from the perspective of discrete computation which would either cause error or sacrifice efficiency. In this work, we provide a unified frequency response analysis from the joint physics-mathematics perspective and propose corresponding adaptive frequency sampling strategies for five popular diffraction calculation methods. With the proposed strategies, the calculation correctness is guaranteed and the calculation efficiency is improved. Such an idea of unified frequency response study would help researchers make a do-it-yourself analysis for various diffraction calculation tasks and choose or develop a method for accurate and efficient computations of the diffraction fields.

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Resolution-enhanced digital in-line holography by extension of the computational bandwidth

Cited by 4 publications

References 27 publications

Enhanced wide-field off-axis holography based on intensity correlation

Enhanced wide-field off-axis holography based on intensity correlation

Randomness assisted in-line holography with deep learning

Frequency sampling strategy for numerical diffraction calculations

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