Phase retrieval in 4f optical system: background compensation and sparse regularization of object with binary amplitude

2012 ◽  
Vol 52 (1) ◽  
pp. A269 ◽  
Author(s):  
Artem Migukin ◽  
Mostafa Agour ◽  
Vladimir Katkovnik
Keyword(s):  
Optical System ◽  
Phase Retrieval ◽  
Sparse Regularization ◽  
Background Compensation

A New Method for Phase Retrieval in the Optical System

1998 ◽  
Vol 15 (1) ◽  
pp. 24-26 ◽  
Author(s):  
Wen-xiang Cong ◽  
Nan-xian Chen ◽  
Ben-Yuan Gu
Keyword(s):  
Optical System ◽  
Phase Retrieval ◽  
New Method

Design of an Optical System for Phase Retrieval based on a Spatial Light Modulator

2010 ◽  
Author(s):  
Claas Falldorf ◽  
Mostafa Agour ◽  
Christoph von Kopylow ◽  
Ralf B. Bergmann ◽  
Pramod K. Rastogi ◽  
...  
Keyword(s):  
Optical System ◽  
Spatial Light Modulator ◽  
Phase Retrieval ◽  
Light Modulator

A Field Emission System For Transmission Electron Microscopy

1973 ◽  
Vol 31 ◽  
pp. 298-299
Author(s):  
Michel Troyonal ◽  
Huei Pei Kuoal ◽  
Benjamin M. Siegelal
Keyword(s):  
Electron Microscope ◽  
Field Emission ◽  
Optical System ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Objective Lens ◽  
Electron Optical System ◽  
Cross Sectional ◽  
Transmission Electron ◽  
Emission System

A field emission system for our experimental ultra high vacuum electron microscope has been designed, constructed and tested. The electron optical system is based on the prototype whose performance has already been reported. A cross-sectional schematic illustrating the field emission source, preaccelerator lens and accelerator is given in Fig. 1. This field emission system is designed to be used with an electron microscope operated at 100-150kV in the conventional transmission mode. The electron optical system used to control the imaging of the field emission beam on the specimen consists of a weak condenser lens and the pre-field of a strong objective lens. The pre-accelerator lens is an einzel lens and is operated together with the accelerator in the constant angular magnification mode (CAM).

Information and estimation in image processing

1987 ◽  
Vol 45 ◽  
pp. 14-17
Author(s):  
B. Roy Frieden
Keyword(s):  
Image Processing ◽  
Optical System ◽  
Large Amplitude ◽  
Communication Theory ◽  
Image Data ◽  
Direct Approach ◽  
Ill Posed

Despite the skill and determination of electro-optical system designers, the images acquired using their best designs often suffer from blur and noise. The aim of an “image enhancer” such as myself is to improve these poor images, usually by digital means, such that they better resemble the true, “optical object,” input to the system. This problem is notoriously “ill-posed,” i.e. any direct approach at inversion of the image data suffers strongly from the presence of even a small amount of noise in the data. In fact, the fluctuations engendered in neighboring output values tend to be strongly negative-correlated, so that the output spatially oscillates up and down, with large amplitude, about the true object. What can be done about this situation? As we shall see, various concepts taken from statistical communication theory have proven to be of real use in attacking this problem. We offer below a brief summary of these concepts.

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