Fast increase of quality of optically reconstructed images in digital holography

2020 ◽  
Author(s):  
Pavel A. Cheremkhin ◽  
Nikolay N. Evtikhiev ◽  
Vitaly V. Krasnov ◽  
Vladislav G. Rodin
Keyword(s):  
Digital Holography ◽  
Fast Increase

Improvement of Quality of Reconstructed Images in Multi-Frame Fresnel Digital Holography

2010 ◽  
Vol 27 (10) ◽  
pp. 104209
Author(s):  
Lu Xiao-Wei ◽  
Li Jing-Zhen ◽  
Chen Hong-Yi
Keyword(s):  
Digital Holography

Phase-shifting digital holography with an unknown reference beam

2021 ◽  
Author(s):  
Roghayeh Yazdani ◽  
Hamidreza Fallah
Keyword(s):  
Digital Holography ◽  
Phase Retrieval ◽  
Reference Beam ◽  
Phase Shifting ◽  
Retrieval Algorithm ◽  
Reference Field ◽  
Digital Holograms ◽  
Noisy Conditions ◽  
Phase Retrieval Algorithm

In digital holography, errors of the reference field degrade the quality of the reconstructed object field. In this paper, we propose an effective method in phase-shifting digital holography in which the reference field does not need to be known and perfect. The unknown complex amplitudes of both reference and object fields are derived simultaneously. The method employs only five digital holograms and a single execution of a phase retrieval algorithm. So, the required measurements and algorithm executions in this method are fewer than those in other methods; it suggests a simpler and faster method. The effectiveness of the suggested method is indicated by simulation, under noise-free and noisy conditions. Moreover, the capability of the method to extract full information about the phase singularities in both fields is demonstrated.

Using a Digital Filter in Incoherent Digital Holography to Improve the Quality of Reconstructed Images

2020 ◽  
Author(s):  
Tetsuhiko Muroi ◽  
Teruyoshi Nobukawa ◽  
Yutaro Katano ◽  
Nobuhiro Kinoshita ◽  
Norihiko Ishii
Keyword(s):  
Digital Filter ◽  
Digital Holography

scholarly journals Wavelength-Selective Phase-Shifting Digital Holography: Color Three-Dimensional Imaging Ability in Relation to Bit Depth of Wavelength-Multiplexed Holograms

2018 ◽  
Vol 8 (12) ◽  
pp. 2410 ◽  
Author(s):  
Tatsuki Tahara ◽  
Reo Otani ◽  
Yasuhiro Takaki
Keyword(s):  
Digital Holography ◽  
3D Imaging ◽  
Dynamic Range ◽  
Three Dimensional ◽  
Image Sensor ◽  
Phase Shifting ◽  
3D Images ◽  
Wavelength Resolution ◽  
The Relationship

The quality of reconstructed images in relation to the bit depth of holograms formed by wavelength-selective phase-shifting digital holography was investigated. Wavelength-selective phase-shifting digital holography is a technique to obtain multiwavelength three-dimensional (3D) images with a full space-bandwidth product of an image sensor from wavelength-multiplexed phase-shifted holograms and has been proposed since 2013. The bit resolution required to obtain a multiwavelength holographic image was quantitatively and experimentally evaluated, and the relationship between wavelength resolution and dynamic range of an image sensor was numerically simulated. The results indicate that two-bit resolution per wavelength is required to conduct color 3D imaging.

Paper No S7.2: Spatial Light Modulator on Glass for High Display Quality of Digital Holography

2015 ◽  
Vol 46 (S1) ◽  
pp. 30-30
Author(s):  
Chun-Won Byun ◽  
Jae-Eun Pi ◽  
Chi-Sun Hwang ◽  
Yong-Hae Kim ◽  
GiHeon Kim ◽  
...  
Keyword(s):  
Spatial Light Modulator ◽  
Digital Holography ◽  
Light Modulator ◽  
Display Quality

Two-Step Phase-Shifting Iterative Algorithm of Improving Quality of Reconstructed Image in Digital Holography

2008 ◽  
Vol 28 (12) ◽  
pp. 2292-2295
Author(s):  
吴友朋 Wu Youpeng ◽  
刘祥萱 Liu Xiangxuan ◽  
王红霞 Wang Hongxia
Keyword(s):  
Iterative Algorithm ◽  
Digital Holography ◽  
Phase Shifting ◽  
Reconstructed Image

scholarly journals Three-Dimensional Reconstruction of Mechanical Parts Based on Digital Holography

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yaohui Dai ◽  
Haiyu Wu ◽  
Gang Zhu ◽  
Yan Yang
Keyword(s):  
Digital Holography ◽  
Optimization Problems ◽  
Three Dimensional ◽  
3D Display ◽  
Mechanical Parts ◽  
First Order ◽  
Reconstruction Image ◽  
Dimensional Reconstruction ◽  
Order Image

In reconstruction of the off-axis digital hologram of diffuse reflection objects, the position of the positive first-order image cannot be accurately obtained because of the low quality of the reconstruction image. This paper focuses on the above problem and proposes a method for marking the first-order image of the 1-FFT surface based on the fast Fourier transform (1-FFT). The parameters of angle of illumination light were investigated, and the maximum relative measurement error is 5.6% by standard objects. The multiaperture stitching technique in cylindrical coordinates is applied to digital holography technology, and the particle swarm optimization algorithm is used to transform the nonlinear equations into optimization problems to solve the splicing parameters. Finally, the 3D display of a typical rotary three-dimensional mechanical part is successfully realized with holography stitching using the above method.

scholarly journals Improving image quality of parallel phase-shifting digital holography

2008 ◽  
Vol 139 ◽  
pp. 012009 ◽  
Author(s):  
Yasuhiro Awatsuji ◽  
Tatsuki Tahara ◽  
Atsushi Kaneko ◽  
Takamasa Koyama ◽  
Kenzo Nishio ◽  
...  
Keyword(s):  
Image Quality ◽  
Digital Holography ◽  
Phase Shifting

scholarly journals Physicochemical and Nutritional Characterization of Brebas for Fresh Consumption from Nine Fig Varieties (Ficus caricaL.) Grown in Extremadura (Spain)

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Cristina Pereira ◽  
Margarita López Corrales ◽  
Alberto Martín ◽  
María del Carmen Villalobos ◽  
María de Guía Córdoba ◽  
...  
Keyword(s):  
Fruit Size ◽  
Mineral Elements ◽  
Ripening Stage ◽  
Highest Weight ◽  
Ripening Stages ◽  
Major Nutrient ◽  
Early Ripening ◽  
Fast Increase

The quality characteristics of brebas for fresh consumption from nine fig varieties at different commercial ripening stages were determined. Physicochemical and nutritional parameters were analyzed for both skin and flesh, and the findings were compared among varieties and ripening stages. The results revealed that the major nutrient components in brebas are sugars, such as glucose and fructose, and mineral elements, including K, Ca, P, and Mg. Most nutrients evaluated are important elements that contribute to the commercial quality of brebas. “Brown Turkey” and “Banane” varieties showed the highest weight and width. The concentrations of the monomer sugars studied were higher in flesh than skin, and the “Cuello Dama Blanco” and “Colar Elche” varieties showed the highest content of these sugars. The early ripening stage, coinciding with a fast increase in fruit size, was also associated with a higher fiber and protein contents, TA, and firmness for “Banane,” “Brown Turkey,” and “Blanca Bétera” varieties. Conversely, the later ripening stage was related to a significant increase of TSS, MI, and color intensity. Finally, no clear changes in the concentrations of organic acids were observed between different varieties and commercial ripening stages.

Improving Reconstruction Image Quality of Digital Holography Using Median Filter and Intensity Subtraction

2011 ◽  
Vol 48 (12) ◽  
pp. 120901
Author(s):  
王存帅 Wang Cunshuai ◽  
张引科 Zhang Yinke ◽  
郝劲波 Hao Jinbo ◽  
吴艳 Wu Yan
Keyword(s):  
Image Quality ◽  
Digital Holography ◽  
Median Filter ◽  
Reconstruction Image
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