OBJECTIVE To investigate the benefit of using time-resolved, laser-induced fluorescence spectroscopy for diagnosing malignant and premalignant lesions of the oral cavity. DESIGN The carcinogen 7,12-dimethylbenz[a]anthracene (DMBA) was applied to 1 cheek pouch of 19 hamsters. The contralateral pouch and the cheek pouches of 3 hamsters without DMBA exposure served as controls. SETTING Univers...

Ultrasonic elastography, via vibration-controlled transient elastography (VCTE), enables to assess, under active mechanical constraints, the elasticity of the liver, correlating with fibrosis stages. On the other hand, the same VCTE probe can also be used in passive mode, acquiring RF lines at different locations in the liver. This paper presents a thorough evaluation of passive-mode RF spectra...

The classical method for estimating the spectral density of a multivariate time series is to first calculate the periodogram, and then smooth it to obtain a consistent estimator. Typically, to ensure the estimate is positive definite, all the elements of the periodogram are smoothed the same way. There are, however, many situations for which different components of the spectral matrix have diff...

Sensor simulators can be used in forecasting the imaging quality of a new hyperspectral imaging spectrometer, and generating simulated data for the development and validation of the data processing algorithms. This paper presents a novel digital sensor simulator for the pushbroom Offner hyperspectral imaging spectrometer, which is widely used in the hyperspectral remote sensing. Based on the im...

ABSTRACT: Cloud microphysical, radiative and optical properties, are important parameters influencing the radiation budget of Earth. The high reflective nature of clouds, is responsible for reflecting a large part of the Sun’s energy back into space and therefore having a direct impact on Earth’s climate. Although clouds are generally not desired from a remote sensing perspective, they can be u...

A spectral-projected gradient method and an extension of the Kubelka-Munk theory are applied to obtain the relevant parameters of the theory from measured diffuse reflectance spectra of pigmented samples illuminated with visible diffuse radiation. The initial estimate of the spectral dependence of the parameters, required by a recursive spectral-projected gradient method, was obtained by use of...

Hyper-Spectral Imaging sensor (HSI) aboarded on the HJ-1A (The Small Satellite Constellation for Environment and Disaster Monitoring) was launched Sep. 6, 2008, in China. HSI covers the spectral range from 450 nm to 950 nm, with average spectral resolution 4nm[1]. Spectral calibration is one of the key performance parameters of hyper-spectral imaging sensor, the decline of spectral performance ...

Ratings of voices’ likability were collected in two successive studies. A single scale seems to be sufficient for assessing such ratings. Based on limited but controlled data, spectral parameters as well as f0 and articulation rate correlate with the ratings obtained. An automatic classification confirms the relevance of spectral features for the perception of likability. As a simple method of ...

Spectral components, obtained via bandpass filtering of images, have become important tools in capturing image variability. We present a two-parameter family of probability densities, called the Bessel forms, to model the marginal densities of the spectral components. The two parameters, called the shape and scale parameters, are used to characterize each spectral component of the image. We der...

This study presents a comparative analysis of acoustic and perceptual cues to place of articulation in English fricatives. Acoustic parameters investigated include spectral peak location, spectral moments, locus equations, F2 onset, overall noise amplitude, relative amplitude, and fricative noise duration. Perception data were collected for isolated fricatives and fricativevowel syllables. The ...