scholarly journals Fast phase reconstruction in off-axis digital holography with zero-order term suppression

2020 ◽  
Vol 50 (3) ◽  
Author(s):  
Guangyu Luan ◽  
Mingguang Shan ◽  
Zhi Zhong ◽  
Bai Xia
Keyword(s):  
Digital Holography ◽  
Order Term ◽  
Zero Order ◽  
Light Illumination ◽  
Reconstruction Method ◽  
Phase Reconstruction ◽  
Fast Phase ◽  
Free Sample ◽  
Suppression Method ◽  
White Light Illumination

A fast phase reconstruction method (FPRM) employing a free-sample hologram can improve the efficiency of phase reconstruction in off-axis digital holography. However, the space-bandwidth product is still confined by spectrum aliasing in the hologram owing to the zero-order term. In this paper, we propose an FPRM that features an efficient zero-order term suppression method called the average gray that can eliminate spectrum shifting. We can implement phase reconstruction by considering both speed and the space-bandwidth product. We verified the validity of our approach for off-axis digital holography using laser and white-light illumination.

Iterative approach for zero-order term elimination in off-axis multiplex digital holography

2017 ◽  
Vol 383 ◽  
pp. 513-517 ◽  
Author(s):  
Dongliang Zhao ◽  
Dongzhuo Xie ◽  
Yong Yang ◽  
Hongchen Zhai
Keyword(s):  
Digital Holography ◽  
Order Term ◽  
Zero Order ◽  
Iterative Approach

Suppression of the zero-order term in off-axis digital holography through nonlinear filtering

2009 ◽  
Vol 48 (34) ◽  
pp. H186 ◽  
Author(s):  
Nicolas Pavillon ◽  
Chandra Sekhar Seelamantula ◽  
Jonas Kühn ◽  
Michael Unser ◽  
Christian Depeursinge
Keyword(s):  
Nonlinear Filtering ◽  
Digital Holography ◽  
Order Term ◽  
Zero Order

Multi-Plane 3-D Holographic Image Fusion in DCT Domain

2013 ◽  
Vol 760-762 ◽  
pp. 572-576
Author(s):  
Hao Zhou ◽  
Ji Hua Gu ◽  
Da Qing Chen
Keyword(s):  
Image Fusion ◽  
Digital Holography ◽  
Order Term ◽  
Zero Order ◽  
Laplacian Operator ◽  
Discrete Wavelet ◽  
Fusion Method ◽  
Fusion Algorithm ◽  
Rectangular Window ◽  
Dct Domain

An improved multi-plane imaging fusion algorithm for 3-D digital holography is presented. Multiple reconstructed images at different distances from single off-axis Fresnel digital hologram are fused using discrete cosine transform (DCT) with different blocks. The zero order term is removed using a Laplacian operator while the conjugate image and dispersed images of defocused objects are eliminated by selecting a simple rectangular window before image fusion. Compared with those fused images obtained directly from the reconstructed images, the fused images qualities are greatly improved and all of the objects will be clearly in focus more quickly than discrete wavelet (DWT) based fusion method.

scholarly journals Numerical iterative approach for zero-order term elimination in off-axis digital holography

2013 ◽  
Vol 21 (23) ◽  
pp. 28314 ◽  
Author(s):  
Zhonghong Ma ◽  
Lijun Deng ◽  
Yong Yang ◽  
Hongchen Zhai ◽  
Qi Ge
Keyword(s):  
Digital Holography ◽  
Order Term ◽  
Zero Order ◽  
Iterative Approach

Effect of Illumination on Organic Polymer Thin-Film Transistors

2003 ◽  
Vol 771 ◽  
Author(s):  
Michael C. Hamilton ◽  
Sandrine Martin ◽  
Jerzy Kanicki
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Drain Current ◽  
Charge Carriers ◽  
Electrical Performance ◽  
Organic Polymer ◽  
Light Illumination ◽  
Polymer Thin Film ◽  
Channel Region ◽  
White Light Illumination

AbstractWe have investigated the effects of white-light illumination on the electrical performance of organic polymer thin-film transistors (OP-TFTs). The OFF-state drain current is significantly increased, while the drain current in the strong accumulation regime is relatively unaffected. At the same time, the threshold voltage is decreased and the subthreshold slope is increased, while the field-effect mobility of the charge carriers is not affected. The observed effects are explained in terms of the photogeneration of free charge carriers in the channel region due to the absorbed photons.

A Color-Doppler Shear-Wave-Imaging Phase-reconstruction Method Using Four Color Flow Images

2016 ◽  
Vol 39 (3) ◽  
pp. 172-188
Author(s):  
Naoki Sunaguchi ◽  
Yoshiki Yamakoshi ◽  
Takahito Nakajima
Keyword(s):  
Image Quality ◽  
Shear Wave ◽  
Initial Phase ◽  
Color Doppler ◽  
Reconstruction Method ◽  
Phase Reconstruction ◽  
Color Flow ◽  
Shear Wave Imaging ◽  
Wave Imaging ◽  
Phase Map

This study investigates shear wave phase map reconstruction using a limited number of color flow images (CFIs) acquired with a color Doppler ultrasound imaging instrument. We propose an efficient reconstruction method to considerably reduce the number of CFIs required for reconstruction and compare this method with Fourier analysis-based color Doppler shear wave imaging. The proposed method uses a two-step phase reconstruction process, including an initial phase map derived from four CFIs using an advanced iterative algorithm of optical interferometry. The second step reduces phase artifacts in the initial phase map using an iterative correction procedure that cycles between the Fourier and inverse Fourier domains while imposing directional filtering and total variation regularization. We demonstrate the efficacy of this method using synthetic and experimental data of a breast phantom and human breast tissue. Our results show that the proposed method maintains image quality and reduces the number of CFIs required to four; previous methods have required at least 32 CFIs to achieve equivalent image quality. The proposed method is applicable to real-time shear wave elastography using a continuous shear wave produced by a mechanical vibrator.

Full field of view super-resolution imaging based on two static gratings and white light illumination

2008 ◽  
Vol 47 (17) ◽  
pp. 3080 ◽  
Author(s):  
Javier García ◽  
Vicente Micó ◽  
Dan Cojoc ◽  
Zeev Zalevsky
Keyword(s):  
White Light ◽  
Super Resolution ◽  
Field Of View ◽  
Light Illumination ◽  
Full Field ◽  
Resolution Imaging ◽  
White Light Illumination
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