Noise reduction in electronic speckle pattern interferometry fringes by merging orthogonally polarised speckle fields

Brozeit, A; Burke, Jan; Helmers, Heinz; Sagehorn, H; Schuh, Roman

doi:10.1016/s0030-3992(98)00060-7

Cited by 10 publications

(5 citation statements)

References 12 publications

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“…Yet, the least-squares solution can be approximated using the Moore-Penrose pseudoinverse [6]. In contrast to other noise reduction methods [7][8][9][10][11][12][13][14][15][16], these proposed noise suppression methods are motionless and do not make use of any postprocessing operations, such as filtering of the reconstructed images. The optimal setup and the noise suppression techniques are discussed in the following sections.…”

Section: Introductionmentioning

confidence: 99%

Optimal noise suppression in Fresnel incoherent correlation holography (FINCH) configured for maximum imaging resolution

2010

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An optimal setup in the sense of imaging resolution for the Fresnel incoherent correlation holography (FINCH) system is proposed and analyzed. Experimental results of the proposed setup in reflection mode suffer from low signal-to-noise ratio (SNR) due to a granular noise. SNR improvement is achieved by two methods that rely on increasing the initial amount of phase-shifted recorded holograms. In the first method, we average over several independent complex-valued digital holograms obtained by recording different sets of three digital phase-shifted holograms. In the second method, the least-squares solution for solving a system of an overdetermined set of linear equations is approximated by utilizing the Moore-Penrose pseudoinverse. These methods improve the resolution of the reconstructed image due to their ability to reveal fine and weak details of the observed object.

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Section: Introductionmentioning

confidence: 99%

Optimal noise suppression in Fresnel incoherent correlation holography (FINCH) configured for maximum imaging resolution

2010

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“…The noise variations between the recordings can also be produced by inducing small changes into any of the multiple parameters that control coherent noise formation [16], at the expense of adding complexity to the setup and alignment of the system. For instance, this can be achieved by slightly changing the angle of the illumination [128,129], recording device [30,130], or even the imaged object [131,132]; it can also be done by using different wavelengths [133,134] or polarizations [31,135] in the illumination, or by introducing moving transmission masks in its path [136][137][138]. In all these cases, after the 𝑁 "looks" have been recorded, their reconstructions must be averaged; this is straightforwardly done as [106]…”

Section: Optical Denoising Methodsmentioning

confidence: 99%

Speckle Reduction in Digital Holographic Microscopy by Physical Manipulation of the Pupil Function

Buitrago-Duque

Garcı́a-Sucerquia

2020

Imaging and Applied Optics Congress

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ResumenLa Microscopía Holográfica Digital (DHM) es una técnica que ha permitido la medición cuantitativa de las diferencias de fase que los objetos microscópicos introducen en una iluminación coherente. Esta técnica, sin embargo, sufre de la presencia de ruido coherente; este infortunado efecto de la iluminación coherente tiene efectos perjudiciales sobre el poder de resolución y la precisión de las mediciones realizadas, obstaculizando la amplia adopción de tecnologías basadas en DHM. Por lo tanto, el desarrollo de DHM y su efectiva implementación en aplicaciones de imágenes cuantitativas de fase está altamente relacionado con el desarrollo de métodos de reducción de ruido robustos que puedan compensar adecuadamente esta limitación.En la presente tesis de maestría, se proponen e implementan estrategias de reducción de ruido que puedan ser aplicadas a mapas de fase cuantitativos obtenidos numéricamente en microscopía holográfica digital. Para lograrlo, se realizó una revisión del estado del arte de las técnicas existentes para reducción de ruido en mapas de fase, identificando que, si bien existen extensas fuentes literarias que abordar el problema de ruido en holografía digital, la mayoría están orientadas hacia información de intensidad; además, las pocas que están optimizadas para reducción de ruido en fase han sido principalmente empleadas en objetos macroscópicos, por lo que no han sido consideradas las condiciones experimentales específicas de DHM. Bajo esta idea, nuevas técnicas de reducción de ruido que se adaptan a las condiciones experimentales específicas de DHM son propuestas, su factibilidad es estudiada en modelaciones numéricas y resultados experimentales, y sus límites de aplicación establecidos con métricas previamente reportadas en la literatura especializada.Los resultados fueron consolidados en 9 manuscritos sometidos a revistas indexadas de circulación internacional, 7 de estos ya publicados, y 6 presentaciones en eventos internacionales. Estos productos constituyen el núcleo de la presente tesis.

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“… 42 . An effective multi-channel method for providing noise diversity in the optical set-up is to record holograms by changing the linear polarization of the object beam while using a circularly polarized reference wavefront 72 , 73 . Another approach consists of moving apertures with areas that are characterized by different transmission factors (in amplitude and/or phase) that can be employed to obtain noise diversity during the exposure time of the recording device 74 , 75 .…”

Section: Optical Solutions For Noise Reductionmentioning

confidence: 99%

Strategies for reducing speckle noise in digital holography

Bianco¹,

Memmolo²,

Leo³

et al. 2018

Light Sci Appl

225

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Digital holography (DH) has emerged as one of the most effective coherent imaging technologies. The technological developments of digital sensors and optical elements have made DH the primary approach in several research fields, from quantitative phase imaging to optical metrology and 3D display technologies, to name a few. Like many other digital imaging techniques, DH must cope with the issue of speckle artifacts, due to the coherent nature of the required light sources. Despite the complexity of the recently proposed de-speckling methods, many have not yet attained the required level of effectiveness. That is, a universal denoising strategy for completely suppressing holographic noise has not yet been established. Thus the removal of speckle noise from holographic images represents a bottleneck for the entire optics and photonics scientific community. This review article provides a broad discussion about the noise issue in DH, with the aim of covering the best-performing noise reduction approaches that have been proposed so far. Quantitative comparisons among these approaches will be presented.

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Noise reduction in electronic speckle pattern interferometry fringes by merging orthogonally polarised speckle fields

Cited by 10 publications

References 12 publications

Optimal noise suppression in Fresnel incoherent correlation holography (FINCH) configured for maximum imaging resolution

Optimal noise suppression in Fresnel incoherent correlation holography (FINCH) configured for maximum imaging resolution

Speckle Reduction in Digital Holographic Microscopy by Physical Manipulation of the Pupil Function

Strategies for reducing speckle noise in digital holography

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