Coded multi-angular illumination for Fourier ptychography based on Hadamard codes

Sun, Jiasong; Zhang, Yuzhen; Zuo, Chao; Chen, Qian; Feng, Shijie; Hu, Yan; Zhang, Jialin

doi:10.1117/12.2189655

Cited by 4 publications

(4 citation statements)

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“…By illuminating multiple LEDs at a time for each captured image, it was shown that the incoherent superposition of the contribution of each LED could be separated within a novel reconstruction algorithm. After this demonstration, several strategies were proposed to choose alternative multiplexing LED patterns [128][129][130][131][132], and similar approaches were also later suggested for spectral multiplexing [79,133]. One of the fastest FP systems to date was demonstrated using this multiplexing concept [26].…”

Section: High-speed Fourier Ptychographymentioning

confidence: 99%

Fourier ptychography: current applications and future promises

et al. 2020

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Traditional imaging systems exhibit a well-known trade-off between the resolution and the field of view of their captured images. Typical cameras and microscopes can either "zoom in" and image at high-resolution, or they can "zoom out" to see a larger area at lower resolution, but can rarely achieve both effects simultaneously. In this review, we present details about a relatively new procedure termed Fourier ptychography (FP), which addresses the above trade-off to produce gigapixel-scale images without requiring any moving parts. To accomplish this, FP captures multiple low-resolution, large field-of-view images and computationally combines them in the Fourier domain into a high-resolution, large field-of-view result. Here, we present details about the various implementations of FP and highlight its demonstrated advantages to date, such as aberration recovery, phase imaging, and 3D tomographic reconstruction, to name a few. After providing some basics about FP, we list important details for successful experimental implementation, discuss its relationship with other computational imaging techniques, and point to the latest advances in the field while highlighting persisting challenges.

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Section: High-speed Fourier Ptychographymentioning

confidence: 99%

Fourier ptychography: current applications and future promises

et al. 2020

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“…Fourier ptychography imaging draws on the idea of synthetic aperture [1] , using LED arrays of different positions for imaging. Acquiring multiple low-resolution images containing different spectrum components, Fourier ptychography use the phase recovery technology, and finally obtains a high-resolution, large field of view imaging results [2][3][4][5][6][7][8] . The phase recovery process is essentially an inverse problem solved optimally.…”

Section: Introductionmentioning

confidence: 99%

Sparsely sampled Fourier ptychography in diffuse reflection

2023

J. Phys.: Conf. Ser.

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Fourier ptychography microscopy combines the idea of aperture synthesis, which enables the synthesis of multiple low-resolution images in the frequency domain to achieve large field-of-view and high-resolution imaging results. The Fourier ptychography imaging technique applied to the field of far-field diffuse reflectance imaging needs to consider the impact of diffuse reflectance speckle formed by the object’s rough surface on the imaging results. Therefore, far-field diffuse reflectance Fourier ptychography often requires more than microscopic imaging of low-resolution images to achieve super-resolution. In response, we design a sparse sampling method that can reduce the number of required low-resolution images to one-fourth of the original sampling, and does not affect the imaging resolution. Experimental results show that our method can significantly improve imaging efficiency and achieve super-resolution far-field imaging with fast sampling.

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“…The final reconstruction resolution is determined by the sum of the objective lens and illumination NAs [20]. In order to exceed the limitations of the original FPM technique, several studies have been reported to further improve FPM and FP [21][22][23][24][25][26][27][28] lately. Some of them correct the system aberrations of FPM and improve its reconstruction accuracy and recovery resolution significantly [21,22,24,28].…”

mentioning

confidence: 99%

“…Some of them correct the system aberrations of FPM and improve its reconstruction accuracy and recovery resolution significantly [21,22,24,28]. The others reduce the measuring time of FPM imaging process and remarkably improve its data acquisition efficiency [23][24][25][26][27]. However, similar to conventional ptychography, FP suffers from a positional misalignment problem, which is rarely mentioned in those developed FP techniques.…”

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confidence: 99%

Efficient positional misalignment correction method for Fourier ptychographic microscopy

Sun¹,

Chen

Zhang

et al. 2016

Biomed. Opt. Express

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159

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Fourier ptychographic microscopy (FPM) is a newly developed super-resolution technique, which employs angularly varying illuminations and a phase retrieval algorithm to surpass the diffraction limit of a low numerical aperture (NA) objective lens. In current FPM imaging platforms, accurate knowledge of LED matrix's position is critical to achieve good recovery quality. Furthermore, considering such a wide field-of-view (FOV) in FPM, different regions in the FOV have different sensitivity of LED positional misalignment. In this work, we introduce an iterative method to correct position errors based on the simulated annealing (SA) algorithm. To improve the efficiency of this correcting process, large number of iterations for several images with low illumination NAs are firstly implemented to estimate the initial values of the global positional misalignment model through non-linear regression. Simulation and experimental results are presented to evaluate the performance of the proposed method and it is demonstrated that this method can both improve the quality of the recovered object image and relax the LED elements' position accuracy requirement while aligning the FPM imaging platforms.

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Coded multi-angular illumination for Fourier ptychography based on Hadamard codes

Cited by 4 publications

References 10 publications

Fourier ptychography: current applications and future promises

Fourier ptychography: current applications and future promises

Sparsely sampled Fourier ptychography in diffuse reflection

Efficient positional misalignment correction method for Fourier ptychographic microscopy

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