Analysis and rejection of systematic disturbances in hyperspectral remotely sensed images of the Earth

Barducci, Alessandro; Pippi, Ivan

doi:10.1364/ao.40.001464

Cited by 32 publications

(22 citation statements)

References 5 publications

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“…Pushbroom imaging spectrometers that are equipped with an imaging detector are affected by striping (Barducci and Pippi 2001), which is a coherent noise pattern that changes with changing wavelength. In the absence of flat-field calibration, the empirical correction algorithm described by Barducci and Pippi (2001) has been adopted to remove this effect. This algorithm is able to separate contributions due to scene texture from those originated by the noise pattern utilizing information from the acquired image data alone.…”

Section: Data Processing: Results and Discussionmentioning

confidence: 99%

“…Each spectral term on the right-hand side of equation (2) is intended to be averaged over the channel bandwidth and the geometrical factor cosq only accounts for the pushbroom sampling scheme (Barducci and Pippi 2001). In fact, pushbroom instruments have an image formation process similar to that of a standard photographic camera, thus providing a geometrical distortion free image that is affected by the cosine brightness abating towards the image's sides.…”

Section: Data Processing: Results and Discussionmentioning

confidence: 99%

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Investigating the angular and spectral properties of natural targets using CHRIS‐PROBA images of San Rossore test site

Barducci

Guzzi

Marcoionni

et al. 2009

International Journal of Remote Sensing

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This paper addresses the use of the bidirectional reflectance distribution function (BRDF) of natural surfaces for remote sensing applications and environmental monitoring. Multiangle images, acquired by the compact high resolution imaging spectrometer (CHRIS) over the San Rossore test site, have been analysed in order to exploit the potential of using the BRDF for data mining and precise retrieval of biophysical and geophysical parameters. The apparent reflectance and the anisotropy factor (ANIF) of selected soil cover types have been computed, after correcting the at-sensor radiance for atmospheric effects. The departure of soil reflectance from the standard Lambertian behaviour has been investigated, together with the hypothesis of BRDF spectral-angular separability. Then, the ANIF dependence on surface optical properties, illumination and viewing geometry has been assessed and demonstrated using an ANIF image. The stability of the atmospheric correction procedure was analysed, studying the retrieved reflectance versus the solar zenith angle.

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Section: Data Processing: Results and Discussionmentioning

confidence: 99%

Section: Data Processing: Results and Discussionmentioning

confidence: 99%

Investigating the angular and spectral properties of natural targets using CHRIS‐PROBA images of San Rossore test site

Barducci

Guzzi

Marcoionni

et al. 2009

International Journal of Remote Sensing

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“…Reflectance was measured on the inner surface of the tube, and endotracheal tubes were compared to internal diameter-matched virgin samples. Light reflectance for each point of the observed surface was measured by a high-resolution (2 nm full width at half maximum (FWHM)) imaging spectrophotometer operating in the visible and near infrared spectral ranges (wavelengths range: 400-700 nm) in the pushbroom mode [18] . The dataset was composed of hyperspectral images in which each pixel was complemented with a full spectral measurement.…”

Section: Methodsmentioning

confidence: 99%

Di-(2-Ethylhexyl)Phthalate Leakage and Color Changes in Endotracheal Tubes after Application in High-Risk Newborns

et al. 2008

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Background: Polyvinylchloride (PVC) is often adopted for making medical devices. Objective: Testing the hypothesis that materials degradation occurs in PVC endotracheal tubes during infant ventilation, thus releasing the known toxic plasticizer di-(2-ethylhexyl)phthalate (DEHP). Materials and Methods: Endotracheal tubes degradation was assessed by: (1) analysis of color and spectral changes in endotracheal tubes after use in the 400- to 700-nm range and compared to virgin samples. Color changes were expressed as euclidean distances in the Commission International de l’Eclairage Laboratory and Lightness-Chroma-Hue (Munsell’s) color spaces (i.e., ΔE, ΔL, Δa, Δb, ΔC, and ΔH units); (2) DEHP leakage was assessed by thermal characterization by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). Data from used tubes were compared with those from either virgin devices or submitted to artificial aging, including O₂-induced oxidation, washing, UV photodegradation and exposition to acid solutions. Results: Significant color differences of 13.33 ± 0.85 ΔE were evidenced in used endotracheal tubes, as compared to virgin samples (p < 0.0001). Chromatic changes were independent from intubation duration. DSC and TGA analyses showed a loss of DEHP from used tubes, as indicated by increase of the glass transition temperature (Tg) and DEHP weight loss. In vivo application of tubes was associated with an aging process whose effects on the optical and spectral properties were similar to those observed following artificial aging processes. Conclusions: Our findings indicate that significant spectrocolorimetric, DSC and TGA changes occur in endotracheal tubes after application, thus demonstrating for the first time the occurrence of in vivomaterials degradation and DEHP leakage from medical devices worldwide used for neonatal ventilation.

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“…vignetting). In order to achieve this result, we have adopted a pre-processing procedure composed by the following steps [6,7] After subtracting the dark signal image (i.e. : the instrument response in absence of illumination) the gathered images are compensated for possible spatially coherent noise patterns, hot and cold pixels and so forth (flat-field calibration).…”

Section: A Retrieval Of Spectral Radiance and Spectral Reflectancementioning

confidence: 99%

Wide spectral range imaging interferometer

Barducci

Guzzi

Lastri

et al. 2017

International Conference on Space Optics — ICSO 2012

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Abstract-In this paper we propose an instrument which is based on a similar payload developed in the framework of the MIOSAT mission of the Italian Space Agency. The instrument is designed on the basis of the following goals: low coast, modularity, plug and play capability, and it should have both wide spectral and spatial range coverage. It will be therefore developed following a modular concept in order to achieve a hyperspectral imager working from visible near infrared up to thermal infrared region.

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Analysis and rejection of systematic disturbances in hyperspectral remotely sensed images of the Earth

Cited by 32 publications

References 5 publications

Investigating the angular and spectral properties of natural targets using CHRIS‐PROBA images of San Rossore test site

Investigating the angular and spectral properties of natural targets using CHRIS‐PROBA images of San Rossore test site

Di-(2-Ethylhexyl)Phthalate Leakage and Color Changes in Endotracheal Tubes after Application in High-Risk Newborns

Wide spectral range imaging interferometer

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