Time multiplexing super resolution using a Barker-based array

Ilovitsh, Asaf; Preter, Eyal; Levanon, Nadav; Zalevsky, Zeev

doi:10.1364/ol.40.000163

Cited by 12 publications

(8 citation statements)

References 16 publications

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“…Diffuse PSFs have been shown to improve depth of field in experiments by Tucker et al [2]. We note further parallels to the present work in the recent paper on the multiplexing approach to super-resolution imaging, obtained using Barker/Ipatov wrapped 2D arrays [3], as well as high throughput 2D coded aperture spectrometry [4]. The diffuse arrays presented here provide template profiles to construct highly efficient super-resolution beams, with applications that range from microscopes to telescopes.…”

Section: Introductionsupporting

confidence: 74%

Sharp images from diffuse beams: factorisation of the discrete delta function

Svalbe,

Paganin,

Petersen

2019

Preprint

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Discrete delta functions define the limits of attainable spatial resolution for all imaging systems. Here we construct broad, multi-dimensional discrete functions that replicate closely the action of a Dirac delta function under aperiodic convolution. These arrays spread the energy of a sharp probe beam to simultaneously sample multiple points across the volume of a large object, without losing image sharpness. A diffuse pointspread function applied in any imaging system can reveal the underlying structure of objects less intrusively and with equal or better signal-to-noise ratio. These multi-dimensional arrays are related to previously known, but relatively rarely employed, onedimensional integer Huffman sequences. Practical point-spread functions can now be made sufficiently large to span the size of the object under measure. Such large arrays can be applied to ghost imaging, which has demonstrated potential to greatly improve signal-to-noise ratios and reduce the total dose required for tomographic imaging. The discrete arrays built here parallel the continuum self-adjoint or Hermitian functions that underpin wave theory and quantum mechanics.

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Section: Introductionsupporting

confidence: 74%

Sharp images from diffuse beams: factorisation of the discrete delta function

Svalbe,

Paganin,

Petersen

2019

Preprint

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“…In this particular application, hundreds of weak reflection events were simultaneously interrogated [17]. The use of an on-off periodic code in an optical mask, in order to improve image resolution, was recently reported [18]. Aperiodic optical masks are used in many other fields.…”

Section: Experimental Results With a Laser Range Finder And Other Appmentioning

confidence: 99%

Non‐coherent pulse compression — aperiodic and periodic waveforms

Levanon

Cohen

Arbel

et al. 2016

IET Radar, Sonar & Navigation

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The growing interest in adopting pulse compression waveforms to non-coherent radar and radar-like systems (e.g. lidar) invites this update and review. The authors present different approaches of designing on-off {1, 0} coded envelopes of transmitted waveforms whose returns can be envelope detected and non-coherently processed. Two approaches are discussed for the aperiodic case: (a) Manchester encoding and (b) mismatched reference. For the periodic case, on-off sequences are described, which produce perfect periodic cross-correlation when cross-correlated with one or more integer number of periods of a two-valued reference sequence {1, −b}. This study provides comprehensive rules for designing periodic on-off waveforms and their references. The periodic waveform's highaverage duty cycle (over 50%) makes it a 'quasi continuous wave (CW) non-coherent waveform', which avoids the pulse-train conflict between average power and unambiguous range. Good experimental results with a laser range finder are presented. Reports on other uses are quoted.

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“…Each row in the array is shifted five pixels to the right relative to the previous row. 9 This gives the pattern shown in Figure 2(a). The resulting cyclic AC of the 13 × 13 array is shown in Figure 2(b).…”

Section: Ipatov-based Arraymentioning

confidence: 89%

“…Other approaches have been developed using different masks to improve the spatial resolution of images. [3][4][5][6][7][8][9] The nature and properties of the mask play an important role in image reconstruction. Some approaches have taken advantage of speckle illumination to improve spatial resolution in optical microscopy.…”

Section: Introductionmentioning

confidence: 99%

Unstained blood smear contrast enhancement using spectral time multiplexing super resolution

Yebouet

Diby

Kaduki

et al. 2020

J. Spectral Imaging

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We report the use of Time Multiplexing Super Resolution (TMSR) to reduce significantly speckle noise in spectral imaging microscopy of unstained thin blood smear samples of malaria-infected blood. The method is based on combining speckle illumination with a moving array serving as an encoding mask. We propose the use of a new encoding mask to improve the performance of the conventional TMSR method. The new mask is a two-dimensional generalisation of the one- dimensional Ipatov code. The mask is projected on the object and 13 low-resolution images captured and subsequently decoded properly using the same array. The low contrast images are added and extracted from the resulting reconstruction, giving a super-resolved, high-contrast image. The Ipatov filter used in this work performs better than the Barker filter.

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Time multiplexing super resolution using a Barker-based array

Cited by 12 publications

References 16 publications

Sharp images from diffuse beams: factorisation of the discrete delta function

Sharp images from diffuse beams: factorisation of the discrete delta function

Non‐coherent pulse compression — aperiodic and periodic waveforms

Unstained blood smear contrast enhancement using spectral time multiplexing super resolution

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