Reduction of speckle noise in holographic images using spatial jittering in numerical reconstructions

Haouat, Mohamed; Garcı́a-Sucerquia, Jorge; Kellou, A.; Picart, Pascal

doi:10.1364/ol.42.001047

Cited by 31 publications

(5 citation statements)

References 21 publications

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“…Digital holographic imaging has demonstrated to be an efficient approach for the measurement of deformation fields and shapes of any object surface. 4,5 Holographic imaging provides highly contrasted amplitude images 6 and phase data for accurate metrology. 7 In the holographic process, the complex-valued object field is numerically reconstructed from the recorded hologram.…”

Section: Full-field Holographic Vibrometrymentioning

confidence: 99%

In vivo investigation of anuran sound localization with achiral digital Fresnel holography

Kieber,

Letourneur,

Sowinski

et al. 2024

Optics and Photonics for Advanced Dimensional Metrology III

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This paper presents a methodology and related experimental results as a first attempt to answer the question of anuran audition and their ability to localize sound at acoustic frequencies they should not. An achiral digital holographic interferometer is designed so as to simultaneously measure the left and right tympanic vibrations on living specimen. The tympanic membranes are excited by an acoustic antenna including 22 loudspeakers emitting sound in the frequency range 1000 Hz to 3000 Hz. The first experimental results are presented.

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Section: Full-field Holographic Vibrometrymentioning

confidence: 99%

In vivo investigation of anuran sound localization with achiral digital Fresnel holography

Kieber,

Letourneur,

Sowinski

et al. 2024

Optics and Photonics for Advanced Dimensional Metrology III

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“…-Averaging using a multispectral radiation source at the stage of digital hologram recording [5,6]; -Averaging using a multispectral radiation source at the stage of particle image reconstruction from a digital hologram [37,38]; -Averaging over several digital holograms [12]; -Averaging over several reconstructed holographic images [4,39].…”

Section: Coherent Noises Associated With the Impact Of Medium Inhomog...mentioning

confidence: 99%

Features of the Application of Coherent Noise Suppression Methods in the Digital Holography of Particles

et al. 2023

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The paper studies the influence of coherent noises on the quality of images of particles reconstructed from digital holograms. Standard indicators (for example, signal-to-noise ratio) and such indicators as the boundary contrast and boundary intensity jump previously proposed by the authors are used to quantify the image quality. With the use of these parameters, for examples of some known methods of suppressing coherent noises in a holographic image (eliminating the mutual influence of virtual and real images in in-line holography, and time averaging), the features and ranges of applicability of such correction were determined. It was shown that the use of the complex field amplitude reconstruction method based on the Gerchberg–Saxton algorithm and the spatial-frequency method improves the quality of determining the particle image boundary (by boundary intensity jump) starting from the distance between a hologram and a particle, which is about twice the Rayleigh distance. In physical experiments with model particles, averaging methods were studied to suppress non-stationary coherent noises (speckles). It was also shown that averaging over three digital holograms or over three holographic images is sufficient to provide a quality of particle image boundary suitable for particle recognition. In the case of multiple scattering, when it is necessary to impose a limit on the working volume length (depth of scene) of the holographic camera, the paper provides estimates that allow selecting the optimal working volume length. The estimates were made using the example of a submersible digital holographic camera for plankton studies.

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“…This requirement also introduces inherent coherent imaging effects in the reconstructed images. In earlier work, the use of low spatial coherent sources [14][15][16], multiplexing holograms methods [17][18][19], image processing methods [20,21], and hybrid methods [22,23] have been studied to improve the imaging quality. In our investigation, we look into a hybrid method of the use of a super continuum source combined with image processing method for coherent imaging effects reduction.…”

Section: Coherent Imaging Effects In Dhmmentioning

confidence: 99%

Pupil apodization in digital holographic microscopy for reduction of coherent imaging effects

et al. 2022

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A dark-field Digital Holographic Microscope with a single lens for imaging is a potential candidate for future overlay metrology on semiconductor wafers. Aberrations caused by this single lens are computationally corrected allowing high-resolution imaging over a large wavelength range. However, the spatially-coherent imaging conditions in our microscope introduce coherent imaging artifacts that can limit the metrology performance. We present computational apodization of the optical field in the exit pupil of the lens as a potentially effective solution to mitigate these coherent imaging effects. A comparison of experimental data and simulations is presented that demonstrates the importance of this apodization in metrology applications. Moreover, our data also shows that exploiting the full potential of DHM requires an imaging lens with low optical scattering levels.

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Reduction of speckle noise in holographic images using spatial jittering in numerical reconstructions

Cited by 31 publications

References 21 publications

In vivo investigation of anuran sound localization with achiral digital Fresnel holography

In vivo investigation of anuran sound localization with achiral digital Fresnel holography

Features of the Application of Coherent Noise Suppression Methods in the Digital Holography of Particles

Pupil apodization in digital holographic microscopy for reduction of coherent imaging effects

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