Adjustable spatial resolution of compressive spectral images sensed by multispectral filter array-based sensors

Mejía-Melgarejo, Yuri Hercilia; Villarreal-Dulcey, Ofelia Patricia; Arguello-Fuentes, Henry

doi:10.17533/udea.redin.n78a12

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…19 Moreover, in a biological setting where the reflectance spectra are smoothly varying, near-continuous spectral sampling often provides minimal additional information compared with a carefully selected set of discrete (multispectral) bands. 19,24,25,30,31 To this end, we designed and built a cost-effective light-emitting diode (LED)-based multispectral illumination system with readily available commercial components to test the potential of spectral-scanning MSI in capillaroscopy. We first compared the differential absorption spectra of Hb and HbO 2 with commercially available LED colors.…”

Section: Introductionmentioning

confidence: 99%

“…MSI is also advantageous when real-time capture is essential, compactness is required, or low system cost is paramount 19 . Moreover, in a biological setting where the reflectance spectra are smoothly varying, near-continuous spectral sampling often provides minimal additional information compared with a carefully selected set of discrete (multispectral) bands 19 , 24 , 25 , 30 , 31 …”

Section: Introductionmentioning

confidence: 99%

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Multispectral imaging of nailfold capillaries using light-emitting diode illumination

et al. 2022

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. Significance The capillaries are the smallest blood vessels in the body, typically imaged using video capillaroscopy to aid diagnosis of connective tissue diseases, such as systemic sclerosis. Video capillaroscopy allows visualization of morphological changes in the nailfold capillaries but does not provide any physiological information about the blood contained within the capillary network. Extracting parameters such as hemoglobin oxygenation could increase sensitivity for diagnosis and measurement of microvascular disease progression. Aim To design, construct, and test a low-cost multispectral imaging (MSI) system using light-emitting diode (LED) illumination to assess relative hemoglobin oxygenation in the nailfold capillaries. Approach An LED ring light was first designed and modeled. The ring light was fabricated using four commercially available LED colors and a custom-designed printed circuit board. The experimental system was characterized and results compared with the illumination model. A blood phantom with variable oxygenation was used to determine the feasibility of using the illumination-based MSI system for oximetry. Nailfold capillaries were then imaged in a healthy subject. Results The illumination modeling results were in close agreement with the constructed system. Imaging of the blood phantom demonstrated sensitivity to changing hemoglobin oxygenation, which was in line with the spectral modeling of reflection. The morphological properties of the volunteer capillaries were comparable to those measured in current gold standard systems. Conclusions LED-based illumination could be used as a low-cost approach to enable MSI of the nailfold capillaries to provide insight into the oxygenation of the blood contained within the capillary network.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multispectral imaging of nailfold capillaries using light-emitting diode illumination

et al. 2022

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“…51,52 Compressive sensing to compensate for the increasing sparsity have also been used successfully. [53][54][55] Specific to technology, such as Fourier SFA 56,57 and hybrid multi-camera approaches 58 and specific to application demosaicing 59 have also been developed.…”

Section: Introductionmentioning

confidence: 99%

N-LMMSE Demosaicing for Spectral Filter Arrays

Amba¹,

Thomas²,

Alleysson³

2017

jist

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Abstract. Spectral filter array (SFA) technology requires development on demosaicing. The authors extend the linear minimum mean square error with neighborhood method to the spectral dimension. They demonstrate that the method is fast and general on Raw SFA images that span the visible and near infra-red part of the electromagnetic range. The method is quantitatively evaluated in simulation first, then the authors evaluate it on real data by the use of non-reference image quality metrics applied on each band. Resulting images show a much better reconstruction of text and high frequencies at the expense of a zipping effect, compared to the benchmark binary-tree method.

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