3D multi-plane sharpness metric maximization with variable corrective phase screens

Banet, Matthias T.; Fienup, James R.; Schmidt, Jason D.; Spencer, Mark F.

doi:10.1364/ao.427719

Cited by 11 publications

(13 citation statements)

References 28 publications

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“…Note that the product of (ν 0 + nδ ν ) and Z r,n (u, v) in the final exponential term will yield a phase term equal to 4πnδ ν Z r,n (u, v)/c, which, as alluded to in the introduction, will be on the order of milliradians of phase and is considered negligible for the bandwidths and surface roughness standard deviations assumed here. 5,9 Going further, if the coarse depth profile Z d (ξ, η) varies slowly over the width of h(u, v) (a specification which we will revisit later), we can remove the exponential term containing Z d (ξ, η) from the convolution leaving…”

Section: Conventional Multi-wavelength 3d Imagingmentioning

confidence: 99%

Effects of speckle decorrelation on motion-compensated, multi-wavelength, 3D digital holography

Banet

Fienup²

2022

Unconventional Imaging and Adaptive Optics 2022

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Digital holography enables 3D imagery after processing frequency-diverse stacks of 2D coherent images obtained from a chirped-frequency illuminator. To compensate for object motion or vibration, a constant temporal frequency or "pilot tone" illuminator can act as a reference for each chirped frequency. This paper examines speckle decorrelation between the chirped and pilot tone illuminators and its effect on the resultant range images. We show that speckle decorrelation between the two illuminators is more severe for facets of the object's surface that are more highly sloped, relative to the optical axis, and that this decorrelation results in noise in the range images in the areas of the object that are highly sloped. We examine the severity of this noise as a function of several imaging parameters and show that post-processing apodization, effectively reducing bandwidth, in the temporal frequency domain can reduce this noise.

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Section: Conventional Multi-wavelength 3d Imagingmentioning

confidence: 99%

Effects of speckle decorrelation on motion-compensated, multi-wavelength, 3D digital holography

Banet

Fienup²

2022

Unconventional Imaging and Adaptive Optics 2022

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“…The goal of AO and WS is to manipulate an aberrated wavefront so as to counteract the aberration and form a diffraction-limited image. Existing image-guided AO and WS search for a wavefront correction that maximizes some image quality metric (30), such as sharpness (31)(32)(33), the power in particular frequency bands (34), variance (26,28), or entropy (29). These image quality metrics are hand-chosen and reflect a priori on what the aberrationfree image should look like.…”

Section: Resultsmentioning

confidence: 99%

NeuWS: Neural wavefront shaping for guidestar-free imaging through static and dynamic scattering media

et al. 2023

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Diffraction-limited optical imaging through scattering media has the potential to transform many applications such as airborne and space-based imaging (through the atmosphere), bioimaging (through skin and human tissue), and fiber-based imaging (through fiber bundles). Existing wavefront shaping methods can image through scattering media and other obscurants by optically correcting wavefront aberrations using high-resolution spatial light modulators—but these methods generally require (i) guidestars, (ii) controlled illumination, (iii) point scanning, and/or (iv) statics scenes and aberrations. We propose neural wavefront shaping (NeuWS), a scanning-free wavefront shaping technique that integrates maximum likelihood estimation, measurement modulation, and neural signal representations to reconstruct diffraction-limited images through strong static and dynamic scattering media without guidestars, sparse targets, controlled illumination, nor specialized image sensors. We experimentally demonstrate guidestar-free, wide field-of-view, high-resolution, diffraction-limited imaging of extended, nonsparse, and static/dynamic scenes captured through static/dynamic aberrations.

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“…Case 1, in the top left, with pilot tone OFF and motion OFF, was simulated in Refs. 6 and 7. Here, both 2D and 3D irradiance images have speckle noise due to the lack of object motion, range images are robust to speckle and scintillation, 8 and range images have somewhat of a “tiled” appearance due to speckle noise, which is discussed later.…”

Section: Introductionmentioning

confidence: 90%

“…Note that the product of (ν0+nδν) and Zr,n(u,v) in the final exponential term yields a phase term equal to 4πnδνZr,n(u,v)/c, which, as alluded to in the introduction, is on the order of milliradians of phase and is considered negligible for the bandwidths and surface roughness standard deviations assumed here 5 , 7 . One can use Eq.…”

Section: Theorymentioning

confidence: 99%

Speckle decorrelation effects on motion-compensated, multi-wavelength 3D digital holography: theory and simulations

Banet

Fienup

2023

Opt. Eng.

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.Digital holography enables 3D imagery after processing frequency-diverse stacks of 2D coherent images obtained from a chirped-frequency illuminator. To compensate for object motion or vibration, which is a common occurrence for long-range imaging, a constant temporal frequency or “pilot-tone” illuminator can act as a reference for each chirped frequency. We examine speckle decorrelation between the chirped and pilot-tone illuminators and its effect on the resultant range images. We show that speckle decorrelation between the two illuminators is more severe for facets of the object’s surface that are more highly sloped, relative to the optical axis, and that this decorrelation results in noise in the range images in the areas of the object that are highly sloped. We develop a theoretical framework along with wave-optics simulations for 3D imaging with a pilot tone, and we examine the severity of this noise as a function of several imaging parameters, including the illumination bandwidth, pulse frequency spacing, and atmospheric turbulence strength; we show that 3D sharpness metric maximization can mitigate some of the noise induced by turbulence, all in a simulated framework.

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3D multi-plane sharpness metric maximization with variable corrective phase screens

Cited by 11 publications

References 28 publications

Effects of speckle decorrelation on motion-compensated, multi-wavelength, 3D digital holography

Effects of speckle decorrelation on motion-compensated, multi-wavelength, 3D digital holography

NeuWS: Neural wavefront shaping for guidestar-free imaging through static and dynamic scattering media

Speckle decorrelation effects on motion-compensated, multi-wavelength 3D digital holography: theory and simulations

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