Image watermarking by using phase retrieval algorithm in gyrator transform domain

2010 ◽  
Vol 283 (24) ◽  
pp. 4923-4927 ◽  
Author(s):  
Zhengjun Liu ◽  
Lie Xu ◽  
Qing Guo ◽  
Chuang Lin ◽  
Shutian Liu
Keyword(s):  
Phase Retrieval ◽  
Image Watermarking ◽  
Retrieval Algorithm ◽  
Transform Domain ◽  
Gyrator Transform ◽  
Phase Retrieval Algorithm

scholarly journals Multi-stage phase retrieval algorithm based upon the gyrator transform

2010 ◽  
Vol 18 (2) ◽  
pp. 1510 ◽  
Author(s):  
José A. Rodrigo ◽  
Hamootal Duadi ◽  
Tatiana Alieva ◽  
Zeev Zalevsky
Keyword(s):  
Phase Retrieval ◽  
Retrieval Algorithm ◽  
Multi Stage ◽  
Gyrator Transform ◽  
Phase Retrieval Algorithm

scholarly journals Complex Wavefront Shaping through a Multi-Core Fiber

2021 ◽  
Vol 11 (9) ◽  
pp. 3949
Author(s):  
Jiawei Sun ◽  
Nektarios Koukourakis ◽  
Jürgen W. Czarske
Keyword(s):  
Phase Retrieval ◽  
Light Field ◽  
Discrete Distribution ◽  
Cell Manipulation ◽  
Retrieval Algorithm ◽  
Optical Cell ◽  
Loop Control ◽  
Wavefront Shaping ◽  
Core Fiber ◽  
Phase Retrieval Algorithm

Wavefront shaping through a multi-core fiber (MCF) is turning into an attractive method for endoscopic imaging and optical cell-manipulation on a chip. However, the discrete distribution and the low number of cores induce pixelated phase modulation, becoming an obstacle for delivering complex light field distributions through MCFs. We demonstrate a novel phase retrieval algorithm named Core–Gerchberg–Saxton (Core-GS) employing the captured core distribution map to retrieve tailored modulation hologram for the targeted intensity distribution at the distal far-field. Complex light fields are reconstructed through MCFs with high fidelity up to 96.2%. Closed-loop control with experimental feedback denotes the capability of the Core-GS algorithm for precise intensity manipulation of the reconstructed light field. Core-GS provides a robust way for wavefront shaping through MCFs; it facilitates the MCF becoming a vital waveguide in endoscopic and lab-on-a-chip applications.

Hidden projection tomography via phase retrieval algorithm

2021 ◽  
Author(s):  
Daniele Ancora ◽  
Diego Di Battista ◽  
Asier Marcos Vidal ◽  
Stella Avtzi ◽  
Giannis Zacharakis ◽  
...  
Keyword(s):  
Phase Retrieval ◽  
Retrieval Algorithm ◽  
Phase Retrieval Algorithm
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