Pure substance quantity determination method in imaging spectrum mixed pixels

Abstract

The invention discloses a pure substance quantity determination method in imaging spectrum mixed pixels, comprising: employing an imaging spectrometer to obtain mixed pixel spectrum data; performing smoothing preprocessing on primary spectra with a lower signal to noise ratio; performing similarity discrimination on obtained pixel spectra, and performing mean centralized processing on primary spectra of higher similarity; simplifying eigenvalue decomposition to project a spectrum matrix onto orthogonal subspaces; descending normalizing obtained subspace eigenvalues to be a weight sequence; and establishing a weight sequence two-dimensional coordinate system, and determining the quantity of mixed pixel pure substances through a geometrical distance automatic distinction mode. The method can efficiently and accurately detect the quantity of mixed pixel pure substances without any prior information, is not only suitable for close range imaging spectra (such as microscopic imaging spectrum) and remote sensing high spectra, but also suitable for grade determination of a non imaging spectrum (such as infrared spectroscopic analysis) black system group.

Description

technical field [0001] The invention relates to the technical field of imaging spectrum analysis, in particular to a method for determining the quantity of pure substances in a mixed pixel of imaging spectrum. Background technique [0002] Imaging spectroscopy technology is the fastest-growing and most eye-catching spectral analysis technology since the 1990s. Using imaging spectrometers to analyze the properties or contents of chemical components of mixed substances has the advantages of fast speed, no damage to samples, simple operation, and good stability. , high efficiency and other characteristics, can be widely used in remote sensing, agriculture and food testing and other fields. Imaging spectral data cubes often contain spectra of tens of thousands of pixel points. Due to the limited spatial resolution of imaging spectrometers or because the analyte is a mixed compound, each pixel usually contains more than one pure substance, so Mixed pixels are formed, and the spe...

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Problems solved by technology

[0008] In view of this, the main purpose of the present invention is to provide a method for automatically determining the number of pure substances for imaging spectrum analysis. This method can solve the problem of artificially setting threshold parameters, high computational complexity, and Technical problems such as low operating efficiency, increased number of spectral bands, and decreased detection accuracy

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