We determine the local galactic extinction towards the field of gamma-ray burst GRB970228 using a variety of methods. We develop a maximum likelihood method for measuring the extinction by comparing galaxy counts in the field of interest to those in a field of known extinction, and apply this method to the GRB970228 field. We also measure the extinction by comparing the observed stellar spectra...

The reflectance spectrum of the species in a hyperspectral data can be modelled as an n­dimensional vector. The spectral angle mapper computes the angle between the vectors which is used to discriminate the species. The spectral information divergence models the data as a probability distribution so that the spectral variability between the bands can be extracted using the stochastic measures. ...

This study was designed to measure the relative contributions to speech intelligibility of spectral envelope peaks (including, but not limited to formants) versus the detailed shape of the spectral envelope. The problem was addressed by asking listeners to identify sentences and nonsense syllables that were generated by two structurally identical source-filter synthesizers, one of which constru...

The total spectral radiant flux scale has been realized at National Institute of Standards and Technology using a goniospectroradiometer for the 360 nm to 800 nm region. The construction of the goniospectroradiometer and results of the scale realization as well as the uncertainty budget are presented. Introduction. There are increasing needs for total spectral radiant flux standards, which are ...

Here is shown a possibility to use a method based on the distant measurement of the spatial distribution of pollutant and greenhouse gases in the boundary layer of atmosphere by measured data on their own radiation in the thermal IR spectral region. Using calculated IR spectra of atmospheric radiation, requirements have been established for spectral measuring equipment based on a Fourier-spectr...

Because of the limited approximation capability of using fixed basis functions, the performance of reflectance estimation obtained by traditional linear models will not be optimal. We propose an approach based on the regularized local linear model. Our approach performs efficiently and knowledge of the spectral power distribution of the illuminant and the spectral sensitivities of the camera is...

A new multi-frequency synthesis algorithm for reconstructing images from multi-frequency VLBI data is proposed. The algorithm is based on a generalized maximumentropy method, and makes it possible to derive an effective spectral correction for images over a broad frequency bandwidth, while simultaneously reconstructing the spectral-index distribution over the source. The results of numerical si...

In order to constrain the nebular density distribution and velocity field, we model nebular lines profiles obtained at very high spectral resolution. The method and computer code applied to 2–3 nebular lines were described in earlier publications. In the present work we analyse 4–11 spectral lines observed simultaneously with the spectrometer ELODIE (R=42 000) for 8 planetary nebulae. For five ...

The efficiency of many speech processing methods rely on accurate modeling of the distribution of the signal spectrum and a majority of prior works suggest that the spectral components follow the Laplace distribution. To improve the probability distribution models based on our knowledge of speech source modeling, we argue that the model should in fact be a multiplicative mixture model, includin...