scholarly journals Embedded pupil function recovery for Fourier ptychographic microscopy: erratum

2015 ◽  
Vol 23 (26) ◽  
pp. 33027 ◽  
Author(s):  
Xiaoze Ou ◽  
Guoan Zheng ◽  
Changhuei Yang
Keyword(s):  
Pupil Function ◽  
Function Recovery

Effects of illumination on image reconstruction via Fourier ptychography

2017 ◽  
Vol 6 (6) ◽  
Author(s):  
Xinrui Cao ◽  
Stefan Sinzinger
Keyword(s):  
Image Reconstruction ◽  
Phase Retrieval ◽  
Imaging System ◽  
Retrieval Algorithm ◽  
Wavefront Aberrations ◽  
Pupil Function ◽  
Illumination System ◽  
Function Recovery ◽  
Led Array ◽  
High Resolution Images

AbstractThe Fourier ptychographic microscopy (FPM) technique provides high-resolution images by combining a traditional imaging system, e.g. a microscope or a 4f-imaging system, with a multiplexing illumination system, e.g. an LED array and numerical image processing for enhanced image reconstruction. In order to numerically combine images that are captured under varying illumination angles, an iterative phase-retrieval algorithm is often applied. However, in practice, the performance of the FPM algorithm degrades due to the imperfections of the optical system, the image noise caused by the camera, etc. To eliminate the influence of the aberrations of the imaging system, an embedded pupil function recovery (EPRY)-FPM algorithm has been proposed [Opt. Express 22, 4960–4972 (2014)]. In this paper, we study how the performance of FPM and EPRY-FPM algorithms are affected by imperfections of the illumination system using both numerical simulations and experiments. The investigated imperfections include varying and non-uniform intensities, and wavefront aberrations. Our study shows that the aberrations of the illumination system significantly affect the performance of both FPM and EPRY-FPM algorithms. Hence, in practice, aberrations in the illumination system gain significant influence on the resulting image quality.

scholarly journals Embedded pupil function recovery for Fourier ptychographic microscopy

2014 ◽  
Vol 22 (5) ◽  
pp. 4960 ◽  
Author(s):  
Xiaoze Ou ◽  
Guoan Zheng ◽  
Changhuei Yang
Keyword(s):  
Pupil Function ◽  
Function Recovery

Function recovery of the shoulder joint of patients in the acute stroke

2016 ◽  
Vol 18 (9) ◽  
pp. 62-67
Author(s):  
S.N. Kaurkin ◽  
◽  
D.V. Skvortsov ◽  
G.E. Ivanova ◽  
◽  
...  
Keyword(s):  
Acute Stroke ◽  
Shoulder Joint ◽  
Function Recovery
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