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学者姓名：江竹青
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Abstract ：
An adaptive filtering method for off-axis digital holographic reconstruction is presented. The spatial spectrum distribution of an off-axis digital hologram is clustered based on the K-means clustering algorithm of unsupervised machine learning . The spatial-spectrum filtering can be carried out by the quantitative comparison of different filtering interception windows. The first-order spectrum including the object information can be automatically located and intercepted after clustering the spatial spectrum distribution of the hologram. The experiment results demonstrate that the reconstruction images with better resolution and imaging quality can be achieved by the adaptive filtering algorithm. This adaptive filtering reconstruction based on K-means clustering provides a new way of automatic reconstruction imaging for off-axis digital holography. (c) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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| GB/T 7714 | SUN, Q. I. U. Y. A. , LIU, Y. I. W. E. I. , CHEN, H. A. O. et al. Adaptive reconstruction imaging based on K-means clustering in off-axis digital holography [J]. | OPTICS CONTINUUM , 2022 , 1 (3) : 475-486 . |
| MLA | SUN, Q. I. U. Y. A. et al. "Adaptive reconstruction imaging based on K-means clustering in off-axis digital holography" . | OPTICS CONTINUUM 1 . 3 (2022) : 475-486 . |
| APA | SUN, Q. I. U. Y. A. , LIU, Y. I. W. E. I. , CHEN, H. A. O. , JIANG, Z. H. U. Q. I. N. G. . Adaptive reconstruction imaging based on K-means clustering in off-axis digital holography . | OPTICS CONTINUUM , 2022 , 1 (3) , 475-486 . |
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Abstract ：
Reconstructing super-resolution images typically requires three or four phase-shift holograms for spectrum decomposing and combination. In the process of recording holograms, the phase shift accuracy of the instrument and environmental vibration will affect the spectrum decomposing results, resulting in reconstruction artifacts. In the simulation, with respect to two kinds of phase shift biases, the digital holographic reconstruction results with three-step and four-step phase-shift methods are compared. All the phase shift methods are much dependent on the accuracy of phase shift values. The four-step phase shift method needs to record more holograms, so its ability to cope with bias is poor, and its spectrum decomposing results is inferior to that with the three-step phase shift method. In a structured-illumination off-axis digital holographic system, the super-resolution imaging for amplitude and phase reconstructions is performed in experiment by using three-step phase shift processing. The results demonstrate that the resolution of the reconstructed images is improved.
Keyword ：
phase-shift phase-shift super-resolution super-resolution off-axis digital holographic microscopy off-axis digital holographic microscopy structured illumination structured illumination
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| GB/T 7714 | Han, Yang , Huang, Meng , Jiang, Zhuqing . Phase-shift reconstruction imaging analysis in off-axis digital holographic microscopy with structured illumination [J]. | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XII , 2022 , 12318 . |
| MLA | Han, Yang et al. "Phase-shift reconstruction imaging analysis in off-axis digital holographic microscopy with structured illumination" . | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XII 12318 (2022) . |
| APA | Han, Yang , Huang, Meng , Jiang, Zhuqing . Phase-shift reconstruction imaging analysis in off-axis digital holographic microscopy with structured illumination . | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XII , 2022 , 12318 . |
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Abstract ：
A measurement method of liquid's refractive index by means of single-shot dual-wavelength off-axis digital holographic microscopy system and a microfluidic chip is presented. The refractive index of liquid filled in the microchannel of a microfluidic chip can be calculated directly with the unwrapped phase map obtained at the synthetized wavelength, without requirement of knowing another liquid's refractive index as a measurement reference. Moreover, it also avoids the influence of the accuracy of the known refractive index on the refractive index to be measured. The refractive indices of salt solutions and sucrose solutions in the several concentrations are achieved in the experiments, which verifies that the measurement of liquid's refractive index is accurate and reliable. With the merit of accurate measurement of liquid's refractive index based on the one-frame dualwavelength hologram, it is expected that this approach will be employed to detect in real-time the fluid's parameters related to its refractive index.
Keyword ：
Dual-wavelength Dual-wavelength Digital holography Digital holography Liquid Liquid Refractive index measurement Refractive index measurement Single-shot Single-shot
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| GB/T 7714 | Huang, Meng , Sun, Chan , Qin, Hongpeng et al. Measurement of liquid refractive index by quantitative phase reconstruction of single frame dual-wavelength digital hologram [J]. | MEASUREMENT , 2022 , 206 . |
| MLA | Huang, Meng et al. "Measurement of liquid refractive index by quantitative phase reconstruction of single frame dual-wavelength digital hologram" . | MEASUREMENT 206 (2022) . |
| APA | Huang, Meng , Sun, Chan , Qin, Hongpeng , Jiang, Zhuqing . Measurement of liquid refractive index by quantitative phase reconstruction of single frame dual-wavelength digital hologram . | MEASUREMENT , 2022 , 206 . |
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Abstract ：
A single-shot dual-wavelength digital holographic microscopy with an adjustable off-axis configuration is presented, which helps realize real-time quantitative phase imaging for living cells. With this configuration, two sets of interference fringes corresponding to their wavelengths can be flexibly recorded onto one hologram in one shot. The universal expression on the dual-wavelength hologram recorded under any wave vector orientation angles of reference beams is given. To avoid as much as possible the effect of zero-order spectrum, we can flexibly select their carry frequencies for the two wavelengths using this adjustable off-axis configuration, according to the distribution feature of object's spatial-frequency spectrum. This merit is verified by a quantitative phase imaging experiment for the microchannel of a microfluidic chip. The reconstructed phase maps of living onion epidermal cells exhibit cellular internal life activities, for the first time to the best of our knowledge, vividly displaying the progress of the nucleus, cell wall, cytoskeleton, and the substance transport in microtubules inside living cells. These imaging results demonstrate the availability and reliability of the presented method for real-time quantitative phase imaging. (C) 2021 Optical Society of America
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| GB/T 7714 | Huang, Meng , Qin, Hongpeng , Jiang, Zhuqing . Real-time quantitative phase imaging by single-shot dual-wavelength off-axis digital holographic microscopy [J]. | APPLIED OPTICS , 2021 , 60 (15) : 4418-4425 . |
| MLA | Huang, Meng et al. "Real-time quantitative phase imaging by single-shot dual-wavelength off-axis digital holographic microscopy" . | APPLIED OPTICS 60 . 15 (2021) : 4418-4425 . |
| APA | Huang, Meng , Qin, Hongpeng , Jiang, Zhuqing . Real-time quantitative phase imaging by single-shot dual-wavelength off-axis digital holographic microscopy . | APPLIED OPTICS , 2021 , 60 (15) , 4418-4425 . |
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Abstract ：
In this paper, automatic filtering for amplitude and phase reconstruction in off-axis digital holography is developed. A user-friendly interface for automatic filtering is given via program design with MATLAB. The hologram to be processed is input at the front end, and automatic spectrum filtering in Fourier spectrum domain of digital holograms is realized by using clustering algorithm at the back end. The amplitude and phase images are reconstructed from the intercepted spatial-frequency spectrum by using the reconstruction algorithm. This automatic filtering program has high robustness, which can achieve reconstruction imaging for off-axis holograms correctly and effectively in the case of different off-axis angles or different image sizes. For the user interface, upon inputting an off-axis digital hologram and confirming the operation, the reconstructed amplitude and phase images can be quickly output. This user interface has the advantages of simple operation, adjustable parameters and clear feedback. Since K-means clustering is used, this filtering algorithm increases the efficiency in processing experimental data and the reliability of reconstruction imaging. The digital hologram computer-generated is used to simulate filtering processing. The results show that the quality of reconstructed images by using the presented automatic filtering is not inferior to that by conventional manual filtering.
Keyword ：
user interface user interface adaptive filtering adaptive filtering clustering algorithm clustering algorithm off-axis digital holography off-axis digital holography
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| GB/T 7714 | Sun, Qiuya , Liu, Yiwei , Chen, Hao et al. Automatic filtering processing in off-axis digital holography with clustering algorithm [J]. | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XI , 2021 , 11898 . |
| MLA | Sun, Qiuya et al. "Automatic filtering processing in off-axis digital holography with clustering algorithm" . | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XI 11898 (2021) . |
| APA | Sun, Qiuya , Liu, Yiwei , Chen, Hao , Wang, Yibo , Jiang, Zhuqing . Automatic filtering processing in off-axis digital holography with clustering algorithm . | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XI , 2021 , 11898 . |
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Abstract ：
In this paper, we present a method to eliminate the zero-order term in Fourier spectrum of off-axis digital holograms based on the linear change of the hologram. In a typical digital holographic setup, the three off-axis holograms are recorded by the object waves and the reference waves with the different intensity ratios. The three holograms were Fourier transformed, and then the spectra were linearly fitted to obtain two fitting coefficients. Then, the second and third holograms are multiplied by the corresponding coefficients, and the first hologram is subtracted from the hologram that is multiplied by the coefficient to obtain the hologram with the zero-order term eliminated. In the procedure of spectrum filtering, more high-frequency information can be intercepted in this spatial-frequency spectrum after removing the zero-order. The experiment results show that this method can obviously eliminate the zero-order term.
Keyword ：
off-axis digital holography off-axis digital holography spectrum filtering spectrum filtering zero-order elimination zero-order elimination digital holographic imaging digital holographic imaging
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| GB/T 7714 | Chen, Hao , Liu, Yiwei , Sun, Qiuya et al. Elimination of the zero-order term in off-axis digital holography by multiplexing light intensity ratio [J]. | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XI , 2021 , 11898 . |
| MLA | Chen, Hao et al. "Elimination of the zero-order term in off-axis digital holography by multiplexing light intensity ratio" . | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XI 11898 (2021) . |
| APA | Chen, Hao , Liu, Yiwei , Sun, Qiuya , Jiang, Zhuqing . Elimination of the zero-order term in off-axis digital holography by multiplexing light intensity ratio . | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XI , 2021 , 11898 . |
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Abstract ：
We present a spectrum filtering approach for reconstruction of off-axis digital holograms. The high frequency aliasing terms in Fourier spectrum domain of hologram are generated by non-fitting interpolation. After interpolation processing, the zero-order terms in the aliasing spectrum region are obviously suppressed. Accordingly, for the spectrum filtering of high-frequency signal terms, the available range of frequency band will increase significantly, which can result in the improvement of resolution of the reconstructed images. In order to avoid the effect of non-uniform distribution on the aliasing spectrum terms, all the same-order signal terms in the aliasing spectrum (positive or negative first-order spectrum) are intercepted, respectively, and then added together to reconstruct the complex amplitude distribution of the sample. We perform the reconstruction imaging with a conventional method and the presented method from the same hologram in simulation. The imaging results show that such interpolation method can obviously improve the resolution of the reconstructed amplitude and phase images. This method for off-axis digital holographic reconstruction only relies on a single frame acquisition to achieve high resolution reconstruction imaging without additional requirements to the optical setup, which will have a promising application in real-time imaging for living biological cells or moving objects.
Keyword ：
imaging resolution imaging resolution Off-axis digital holography Off-axis digital holography Spectrum filtering Spectrum filtering Kronecker production Kronecker production
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| GB/T 7714 | Liu, Yiwei , Wang, Yibo , Sun, Qiuya et al. High resolution reconstruction in off-axis digital holographic imaging by using aliasing-spectrum filtering [J]. | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XI , 2021 , 11898 . |
| MLA | Liu, Yiwei et al. "High resolution reconstruction in off-axis digital holographic imaging by using aliasing-spectrum filtering" . | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XI 11898 (2021) . |
| APA | Liu, Yiwei , Wang, Yibo , Sun, Qiuya , Chen, Hao , Qin, Hongpeng , Jiang, Zhuqing . High resolution reconstruction in off-axis digital holographic imaging by using aliasing-spectrum filtering . | HOLOGRAPHY, DIFFRACTIVE OPTICS, AND APPLICATIONS XI , 2021 , 11898 . |
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Abstract ：
We present a method of single-frame reconstruction in off-axis digital holography with Kronecker-product interpolation to maximize spatial-frequency extraction. The Kronecker-product interpolation operated on a one-frame off-axis digital hologram can generate several aliasing spectra in its Fourier domain, where the zero-order aliasing spectra in the extrapolation region can be suppressed effectively. After adding all aliasing spectrum regions and substituting each aliasing spectrum in place with their sum, spectrum interception with a larger scope for filtering can be made in one of the aliasing spectrum regions. The experimental results demonstrate that the method is valid to improve the resolution in off-axis digital holography. (C) 2020 Optical Society of America
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| GB/T 7714 | Liu, Yiwei , Jiang, Zhuqing , Wang, Yibo et al. Single-frame reconstruction for improvement of off-axis digital holographic imaging based on image interpolation [J]. | OPTICS LETTERS , 2020 , 45 (24) : 6623-6626 . |
| MLA | Liu, Yiwei et al. "Single-frame reconstruction for improvement of off-axis digital holographic imaging based on image interpolation" . | OPTICS LETTERS 45 . 24 (2020) : 6623-6626 . |
| APA | Liu, Yiwei , Jiang, Zhuqing , Wang, Yibo , Sun, Qiuya , Chen, Hao . Single-frame reconstruction for improvement of off-axis digital holographic imaging based on image interpolation . | OPTICS LETTERS , 2020 , 45 (24) , 6623-6626 . |
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Abstract ：
An optimization algorithm is developed to extend the unambiguous range of DWDH, which is suitable for imaging living onion epidermal cells, and meanwhile to reduce the noise. In the experiments, the holograms with two wavelengths can be acquired in a single shot recording by using off-axis dual-wavelength digital holography, resulting to obtain their two sets of spatial spectrum via Fourier transform for these two holograms. The denoised unwrapping phase image of sample is straightforward reconstructed with the optimization algorithm, instead of increasing the noise due to longer synthetic wavelength. As a result, the unwrapped phase images of onion epidermal cells are achieved.
Keyword ：
phase unwrapping phase unwrapping dual-wavelength digital holography dual-wavelength digital holography phase contrast phase contrast onion epidermal cells onion epidermal cells Digital holographic microscopy Digital holographic microscopy
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| GB/T 7714 | Qin, Hongpeng , Qin, Rikang , Jiang, Zhuqing . Improvement and denoising for Dual-Wavelength Digital Holographic Microscopy [C] . 2020 . |
| MLA | Qin, Hongpeng et al. "Improvement and denoising for Dual-Wavelength Digital Holographic Microscopy" . (2020) . |
| APA | Qin, Hongpeng , Qin, Rikang , Jiang, Zhuqing . Improvement and denoising for Dual-Wavelength Digital Holographic Microscopy . (2020) . |
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Abstract ：
In this paper, an off-axis digital holography multi-frame image super-resolution reconstruction method is presented. Each low-resolution hologram will have small displacement in different directions. The obtained low-resolution holograms are processed iteratively with the super-resolution algorithm to obtain the super-resolution hologram, and then the amplitude image is reconstructed from the super-resolution hologram. The imaging results show that the resolution of the reconstructed image after super-resolution processing is obviously improved, because of increase of high-frequency information in the high-resolution hologram.
Keyword ：
imaging resolution imaging resolution phase reconstruction phase reconstruction imaging reconstruction algorithm imaging reconstruction algorithm super-resolution imaging super-resolution imaging Digital holography Digital holography
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| GB/T 7714 | Wang, Yibo , Liu, Yiwei , Chen, Hao et al. Optimization of High-Resolution Reconstruction Algorithm for Off-axis Digital Holographic Imaging [C] . 2020 . |
| MLA | Wang, Yibo et al. "Optimization of High-Resolution Reconstruction Algorithm for Off-axis Digital Holographic Imaging" . (2020) . |
| APA | Wang, Yibo , Liu, Yiwei , Chen, Hao , Sun, Qiuya , Jiang, Zhuqing . Optimization of High-Resolution Reconstruction Algorithm for Off-axis Digital Holographic Imaging . (2020) . |
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