DC suppression in in-line digital holographic microscopes on the basis of an intensity-averaging method using variable pixel numbers

Cho, Hyungjun; Woo, Jong-Kwan; Kim, Doocheol; Shin, Sanghoon; Yu, Younghun

doi:10.1016/j.optlastec.2009.01.001

Cited by 9 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The overlap of these three fields degrades resolution and contrast in the object reconstruction. One can apply DC suppression techniques to enhance object reconstructions [21][22][23], and measurements of the energy in the reference beam alone can be made and subtracted from the hologram:…”

Section: A Hologram Recording Geometrymentioning

confidence: 99%

Millimeter-wave compressive holography

et al. 2010

View full text Add to dashboard Cite

We describe an active millimeter-wave holographic imaging system that uses compressive measurements for three-dimensional (3D) tomographic object estimation. Our system records a two-dimensional (2D) digitized Gabor hologram by translating a single pixel incoherent receiver. Two approaches for compressive measurement are undertaken: nonlinear inversion of a 2D Gabor hologram for 3D object estimation and nonlinear inversion of a randomly subsampled Gabor hologram for 3D object estimation. The object estimation algorithm minimizes a convex quadratic problem using total variation (TV) regularization for 3D object estimation. We compare object reconstructions using linear backpropagation and TV minimization, and we present simulated and experimental reconstructions from both compressive measurement strategies. In contrast with backpropagation, which estimates the 3D electromagnetic field, TV minimization estimates the 3D object that produces the field. Despite undersampling, range resolution is consistent with the extent of the 3D object band volume.

show abstract

Section: A Hologram Recording Geometrymentioning

confidence: 99%

Millimeter-wave compressive holography

et al. 2010

View full text Add to dashboard Cite

show abstract

“…A simple and conventional approach to suppress the DCnoise can be realized by lowering the DC-bias of the fringe pattern [4], [5] as…”

Section: Conventional Dc-noise Reductionmentioning

confidence: 99%

Laplace Operation-Based DC Noise Reduction in Digital Holography

Cho

Choi

Kang

et al. 2013

IEEE Photon. Technol. Lett.

View full text Add to dashboard Cite

The in-line holography has obvious advantages especially in wider spatial bandwidth over the off-axis holography. However, a direct current (DC)-noise and an unwanted twin image should be separated or eliminated for a high quality reconstruction. Therefore, we introduce an effective Laplace operation-based numerical approach for DC-noise reduction in the in-line holography. The DC-noise in a holographic fringe pattern can be efficiently reduced by applying a second derivative operation while maintaining the two real and twin terms. For the performance evaluation, the proposed method is compared with the existing approaches, including the intensity average subtraction and frequency-domain filtering, which are generally used for the numerical holographic reconstruction. Experimental results show that the proposed method is numerically appropriate, and provides the high quality reconstruction for a digital holography. Therefore, we believe that the proposed scheme can be a useful tool for high quality reconstruction in the in-line holography.

show abstract

“…그러므로 재생상는 다음과 같 은 두식을 퓨리에변환 함으로서 얻을 수 있다 [16] . 항은 가변 픽셀 평균 빛세기 방법을 이용하여 제거하였다 [18] . 그림 2는 재생거리를 일정하게 놓고, 재생상의 픽셀 크기를 변화시켜 얻은 위상 재생상이다.…”

Section: 이론적 배경unclassified

A Study on Two-wavelength Digital Holography Using the Fresnel-Bluestein Transform

Shin¹,

Kim²,

2012

Korean Journal of Optics and Photonics

Self Cite

View full text Add to dashboard Cite

Dual-wavelength holography has a better axial range than single-wavelength holography, allowing unambiguous phase imaging. The size of a reconstructed image depends on the reconstruction distance and wavelength. The two phase image sizes of different wavelength holograms should be the same in order to apply dual-wavelength holography. The Fresnel-Bluestein transform method is proposed to eliminate the dependence on the reconstruction distance and wavelength. We found that the Fresnel-Bluestein transform is very useful for making different reconstructed image sizes experimentally. Also we applied the Fresnel-Bluestein transform to make the same reconstruction image size in dual wavelength holography.

show abstract

DC suppression in in-line digital holographic microscopes on the basis of an intensity-averaging method using variable pixel numbers

Cited by 9 publications

References 10 publications

Millimeter-wave compressive holography

Millimeter-wave compressive holography

Laplace Operation-Based DC Noise Reduction in Digital Holography

A Study on Two-wavelength Digital Holography Using the Fresnel-Bluestein Transform

Contact Info

Product

Resources

About