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A Method of Hyperspectral Mixed Pixel Decomposition Based on Compressed Sensing

A technology of mixed pixel decomposition and compressed sensing, which is applied in the field of hyperspectral remote sensing and compressed sensing, and can solve the problem of slow decomposition of mixed pixels

Active Publication Date: 2017-01-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] The purpose of the present invention is to solve the problem of slow decomposition of mixed pixels when traditional Nyquist sampling theorem is used to collect hyperspectral image data. method

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  • A Method of Hyperspectral Mixed Pixel Decomposition Based on Compressed Sensing
  • A Method of Hyperspectral Mixed Pixel Decomposition Based on Compressed Sensing
  • A Method of Hyperspectral Mixed Pixel Decomposition Based on Compressed Sensing

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specific Embodiment approach 1

[0048] Specific embodiment 1: A method for decomposing hyperspectral mixed pixels based on compressed sensing described in this embodiment, the method is:

[0049] Step 1: Input the observation matrix Φ and the compressed observation matrix Y, and use the compressed sensing theory to establish a spectral mixing model:

[0050] Y=ΦX T = Φ(AS) T (1)

[0051] Φ∈R M×N is an M×N observation matrix, R is a real number,

[0052] X∈R L×N is an L×N mixed pixel spectral matrix,

[0053] Y∈R M×L is a compressed observation matrix of M×L,

[0054] S∈R P×N is a P×N endmember abundance matrix,

[0055] A∈R L×P is the endmember spectral matrix of L×P,

[0056] Step 2, initialization, randomly select an endmember spectral matrix A as the estimated value of the endmember spectral matrix A and is a matrix of L×P,

[0057] Let the estimated value of the endmember abundance matrix S be:

[0058] S ^ = 0 ...

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Abstract

The invention relates to a method for unmixing a hyperspectral mixed pixel based on compressed sensing, and relates to the compressed sensing field and the hyperspectral remote sensing field. The method is used for solving the problem of low mixed pixel unmixing speed during hyperspectral image data acquisition by use of the traditional Nyquist sampling theorem. The method comprises the steps of firstly, inputting a measurement matrix Phi and a compressed measurement matrix Y and establishing a spectral mixing model Y=PhiXT=Phi(AS)T by use of the compressed sensing theory, secondly, performing iterative processing on the estimated value S^ of an end member abundance matrix S and the estimated value A^ of an end member spectrum matrix A, and if the difference of absolute values of every corresponding element in the estimated values A^ of the end member spectrum matrix A obtained by two adjacent times of iterative processing is smaller than 0.1, stopping iteration and outputting the end member abundance matrix S^ and completing the unmixing of the hyperspectral mixed pixel, otherwise, continuing the iterative processing. The method is mainly applied to unmixing the hyperspectral mixed pixels.

Description

technical field [0001] The invention relates to the fields of compressed sensing and hyperspectral remote sensing. Background technique [0002] Hyperspectral imaging technology is a new type of earth observation technology developed in the field of remote sensing. The typical hardware device is an imaging spectrometer. The imaging spectrometer decomposes the electromagnetic wave signal into many tiny, adjacent bands through spectroscopic technology, and the energy on the corresponding bands is received by different sensors. Therefore, compared with traditional remote sensing imaging technology, hyperspectral imaging technology has the characteristics of integrated map, multiple spectral bands, and high spectral resolution, and has great advantages in surface material identification, classification, and feature extraction. The spatial resolution of hyperspectral images is low, so it is inevitable to produce mixed pixels, and the existence of mixed pixels has become an obsta...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T9/00
Inventor 付宁徐红伟殷聪如乔立岩
Owner HARBIN INST OF TECH