An analysis of coded aperture acquisition and reconstruction using multi-frame code sequences for relaxed optical design constraints

Stayman, J. Webster; Subotic, Nikola S.; Buller, William

doi:10.1117/12.825347

Cited by 9 publications

(7 citation statements)

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“…Although the benefits of the masks are most pronounced for monochromatic imaging, good performance with an extended bandwidth is shown to be possible. By employing low-dimensional mask optimization (in contrast to the high-dimensional optimization proposed in [15]), binary contour masks can be calculated efficiently, facilitating their use in adaptive optics. Furthermore, adaptive programmable masks could enable image recovery for unknown aberrations following a similar approach to those currently used in conjunction with deformable mirrors [22][23][24].…”

Section: Discussionmentioning

confidence: 99%

“…(4); however, for a broad range of spatial frequencies and an arbitrary aberration, such a mask might not exist. The optimal mask can be found by a rigorous search over a high-dimensional discretized mask space [15]. Although such an approach is practical when the aberration and optimal mask are fixed, for dynamic aberrations requiring an adaptive optimization of masks, the computational burden for this approach is probably too great for most real-time applications.…”

Section: Contrast Obtainable In the Presence Of Large Aberrationsmentioning

confidence: 99%

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Correction of optical phase aberrations using binary-amplitude modulation

Vettenburg

Harvey

2011

J. Opt. Soc. Am. A

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We show that phase aberrations in an imaging system can be mitigated using binary-amplitude masks that reduce destructive interference in the image spatial frequency domain. Appropriately designed masks increase the magnitude of the optical transfer function and prevent nulls. This offers a low-cost, transmission-mode alternative to phase correction as used in active and adaptive optics, without a restriction on the waveband of operation.

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Section: Discussionmentioning

confidence: 99%

Section: Contrast Obtainable In the Presence Of Large Aberrationsmentioning

confidence: 99%

Correction of optical phase aberrations using binary-amplitude modulation

Vettenburg

Harvey

2011

J. Opt. Soc. Am. A

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“…If the point-spread function does not vary too greatly over a sufficiently large region (say 100x100 pixels) then the problem can be viewed as a deconvolution and Fourier domain methods can be used as in [13].…”

Section: Processing For Super-resolutionmentioning

confidence: 99%

“…The super-resolution processing can either be carried out in the spatial domain (see [9]) or the Fourier domain (see [13]). .…”

Section: Processing For Super-resolutionmentioning

confidence: 99%

An adaptive coded aperture imager: building, testing and trialing a super-resolving terrestrial demonstrator

Slinger¹,

Bennett

Dyer³

et al. 2011

SPIE Proceedings

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There is an increasingly important requirement for day and night, wide field of view imaging and tracking for both imaging and sensing applications. Applications include military, security and remote sensing. We describe the development of a proof of concept demonstrator of an adaptive coded-aperture imager operating in the mid-wave infrared to address these requirements. This consists of a coded-aperture mask, a set of optics and a 4k x 4k focal plane array (FPA). This system can produce images with a resolution better than that achieved by the detector pixel itself (i.e. superresolution) by combining multiple frames of data recorded with different coded-aperture mask patterns. This superresolution capability has been demonstrated both in the laboratory and in imaging of real-world scenes, the highest resolution achieved being ½ the FPA pixel pitch. The resolution for this configuration is currently limited by vibration and theoretically ¼ pixel pitch should be possible. Comparisons have been made between conventional and ACAI solutions to these requirements and show significant advantages in size, weight and cost for the ACAI approach.

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“…The diffraction leads to energy dispersion of the information, which means there is a tradeoff between the convenience of measurement with more sensing cells and the algorithmic complexity for imaging reconstruction with high quality [15]. Their following works were mainly focused on PSF control (including mask pattern design [16] and microshutter array technology [17]) and the imaging reconstruction based on PSF calibration [18,19]. Recently, the compressed sensing is introduced into infrared imaging to achieve super-resolution.…”

Section: Introductionmentioning

confidence: 99%

A model of PSF estimation for coded mask infrared imaging

et al. 2014

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The point spread function (PSF) of imaging system with coded mask is generally acquired by practical measurement with calibration light source. As the thermal radiation of coded masks are relatively severe than it is in visible imaging systems, which buries the modulation effects of the mask pattern, it is difficult to estimate and evaluate the performance of mask pattern from measured results. To tackle this problem, a model for infrared imaging systems with masks is presented in this paper. The model is composed with two functional components, the coded mask imaging with ideal focused lenses and the imperfection imaging with practical lenses. Ignoring the thermal radiation, the systems PSF can then be represented by a convolution of the diffraction pattern of mask with the PSF of practical lenses. To evaluate performances of different mask patterns, a set of criterion are designed according to different imaging and recovery methods. Furthermore, imaging results with inclined plane waves are analyzed to achieve the variation of PSF within the view field. The influence of mask cell size is also analyzed to control the diffraction pattern. Numerical results show that mask pattern for direct imaging systems should have more random structures, while more periodic structures are needed in system with image reconstruction. By adjusting the combination of random and periodic arrangement, desired diffraction pattern can be achieved.

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An analysis of coded aperture acquisition and reconstruction using multi-frame code sequences for relaxed optical design constraints

Cited by 9 publications

References 0 publications

Correction of optical phase aberrations using binary-amplitude modulation

Correction of optical phase aberrations using binary-amplitude modulation

An adaptive coded aperture imager: building, testing and trialing a super-resolving terrestrial demonstrator

A model of PSF estimation for coded mask infrared imaging

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