spectral bands

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• Spectral bands — are part of optical spectra of polyatomic systems, including condensed materials, large molecules etc. Each line corresponding to one level in atom splits in molecules. When the number of atoms is large, one gets continuum of energy levels, so… …   Wikipedia

• Spectral flatness — is a measure used in digital signal processing to characterise an audio spectrum. A high spectral flatness indicates that the spectrum has a similar amount of power in all spectral bands this would sound similar to white noise, and the graph of… …   Wikipedia

• Spectral envelope — In remote sensing using a spectrometer, the spectral envelope of a feature is the boundary of its spectral properties, as defined by the range of brightness levels in each of the spectral bands of interest. References *… …   Wikipedia

• Spectral analysis — may refer to:* Spectrum analysis, in physics, a method of analyzing the chemical properties of matter from bands in their optical spectrum * Spectral theory, in mathematics, a theory that extends eigenvalues and eigenvectors to linear operators… …   Wikipedia

• Spectral band replication — (SBR) is a technology to enhance audio or speech codecs, especially at low bit rates and is based on harmonic redundancy in the frequency domain.It can be combined with any audio compression codec: the codec itself transmits the lower and… …   Wikipedia

• Multi-spectral image — Multi spectral imaging is a technology originally developed for space based imaging. Multi spectral imaging can capture light from frequencies beyond the visible light range, such as infrared. This can allow extraction of additional information… …   Wikipedia

• Full Spectral Imaging — is a form of Imaging spectroscopy and is the successor to Hyperspectral imaging. Full Spectral Imaging was developed to improve the capabilities of Earth remote sensing (see also remote sensing). Hyperspectral imaging acquires data as many… …   Wikipedia

• multi-spectral imagery — The image of an object obtained simultaneously in a number of discrete spectral bands. Also called MSI …   Military dictionary

• Critical bands — The term critical band, introduced by Harvey Fletcher in the 1940s, referred to the frequency bandwidth of the then loosely defined auditory filter. Since Georg von Békésy’s studies (1960), the term also refers literally to the specific area on… …   Wikipedia

• Electro-optical MASINT — is a subdiscipline of Measurement and Signature Intelligence, (MASINT) and refers to intelligence gathering activities which bring together disparate elements that do not fit within the definitions of Signals Intelligence (SIGINT), Imagery… …   Wikipedia

• Normalized Difference Vegetation Index — Negative values of NDVI (values approaching 1) correspond to water. Values close to zero ( 0.1 to 0.1) generally correspond to barren areas of rock, sand, or snow. Lastly, low, positive values represent shrub and grassland (approximately 0.2 to 0 …   Wikipedia