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首页 FINCH提升的轴向分辨率与信噪比:非相干相干全息术的压缩数字成像突破
FINCH提升的轴向分辨率与信噪比:非相干相干全息术的压缩数字成像突破
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本文探讨了一种创新的数字全息成像技术——菲涅耳非相干相关全息术(FINCH),它旨在突破传统空间非相干数字全息成像的限制,特别强调了在超分辨率成像方面的潜力。FINCH被设计成一种压缩感知模式,这种模式借鉴了压缩感知理论,允许在有限的数据采样下恢复高分辨率的图像。通过将全息重建过程转化为一个反问题求解,该技术能够优化图像在轴向方向上的分辨率,即在深度信息上的分辨能力。 相比于传统的实值信号处理,FINCH在处理复值全息图时,显著提升了信号到噪声比(Signal-to-Noise Ratio,SNR)。这是因为在FINCH系统中,通过更有效的数据处理和算法优化,减少了噪声的影响,从而使得重构出的图像质量更高,细节更加清晰。这种技术的进步对于许多应用,如光学微纳结构分析、生物医学成像以及光通信等领域,都有着重要的实际意义,因为它能够提供更精确的三维层析成像。 本文详细地讨论了所提出的 FINCH 方法的重构保证和准确性,包括理论基础、实验验证和可能的应用场景。作者们在12月接收了这篇文章,并在经过修订后于2月接受并发布,最终于3月发表。这项研究成果展示了在信息技术光子学领域的一项重要突破,为未来全息成像技术的发展开辟了新的可能性。 这篇研究论文提供了一种创新的数字化全息成像策略,通过自干扰压缩技术和改进的重建方法,实现了对轴向分辨率和信噪比的显著提升,这对于提高成像质量和精度具有重大价值。随着科学技术的不断发展,这将对提高各种高分辨率成像系统的性能产生深远影响。
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Self-interference compressive digital
holography with improved axial resolution
and signal-to-noise ratio
TIANLONG MAN,
1,2
YUHONG WAN,
1,2,
*FAN WU,
1,2
AND DAYONG WANG
1,2
1
Institute of Information Photonics Technology, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, Beijing 100124, China
2
College of Applied Sciences, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, Beijing 100124, China
*Corresponding author: yhongw@bjut.edu.cn
Received 1 December 2016; revised 21 February 2017; accepted 21 February 2017; posted 22 February 2017 (Doc. ID 281938);
published 13 March 2017
Fresnel incoherent correlation holography (FINCH) was proposed to break the barrier of spatial incoherent dig-
ital holographic imaging and show the potential of super-resolution imaging preferences. We developed FINCH
as a compressive sensing modality and reconstruction procedure as an inverse problem in order to realize 3D
tomographic imaging. Improved axial resolution is obtained via compressive reconstruction. Reconstruction
guarantees and accuracy of the proposed method are discussed. Compared with the real-valued signal operation,
the signal-to-noise ratio of the results is increased when reconstructing from the complex-valued hologram
obtained from the FINCH system.
© 2017 Optical Society of America
OCIS codes: (090.1995) Digital holography; (070.0070) Fourier optics and signal processing; (110.6880) Three-dimensional image
acquisition; (100.6950) Tomographic image processing.
https://doi.org/10.1364/AO.56.000F91
1. INTRODUCTION
Digital holography (DH) is a typical interferometric imaging
technique that enables quantitative phase contrast [1]or3D
imaging [2,3]. However, the validity of the conventional
DH techniques is challenged because most kinds of micro-
scopes, such as LED illuminated wide-field microscopes and
fluorescent microscopes, are spatial incoherent imaging
systems. On the other hand, it was realized for a long time that
spatial mutual coherence is not necessary for holographic re-
cording [4,5]. In self-interference digital holography (SIDH),
the holograms are recorded by exploring the spatial self-coher-
ence property of two beams that originated from the same point
object. Many SIDH techniques have been proposed and devel-
oped over recent years [6–14]. Using a specific optical setup
[7,11,12] or spatial light modulator (SLM) [6,8,9,13,14],
the light from each object point is split into two waves that
can interfere on the recording plane. Many performances of
SIDH such as imaging speed [8,11,12] and resolution
[9,10,13,14] have been investigated. The basic principle of
Fresnel incoherent correlation holography (FINCH), a success-
ful implementation of SIDH, was first demonstrated in [6].
The FINCH system with resolution beyond the Rayleigh limit
has been verified [15]. Using a high diffraction efficiency
gradient refraction index lens, super-resolution FINCH
microscopy was proposed [16].
In practical microscopic applications, it would be desired to
eliminate the artifacts introduced by out-of-focus light or
strong diffusion of the biological samples. In other words,
the axial resolution of the microscopic system has to be im-
proved to provide a 3D sectioning imaging ability. A lot of
optical techniques such as confocal microscopy have been
successfully applied to many biomedical investigations.
Unfortunately, DH records interference patterns of light from
all layers of a 3D object and, consequently, cannot reconstruct
the depth information exactly [17]. SIDH is unique superior to
DH in revealing 3D information because the light from any
two points of the samples is incoherent. However, the
SIDH is still restricted by the interplane cross-talk artifacts.
Combined with the confocal spinning disk [10] or phase pin-
hole [18], FINCH systems with improved axial resolution have
been proposed. The imaging speed also can be improved by
using parallel-mode scanning [19]. However, the digital or
mechanical scanning elements, which are necessary in those
kinds of techniques, make the system too complex and increase
the acquisition time, finally restricting the application of the
techniques.
Conventional digital holography cannot be regarded as a
“real” 3D tomographic imaging technique because 3D object
estimation from a single 2D hologram is ill-posed. The number
of measurements is much smaller than the number of voxels in
Research Article
Vol. 56, No. 13 / May 1 2017 / Applied Optics F91
1559-128X/17/130F91-06 Journal © 2017 Optical Society of America
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