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A preprocessing method for spectral imaging visualization of open water detection

A spectral imaging and water body technology, which is applied in the field of visual preprocessing of spectral imaging, can solve the problems of unstable spectral signals, increased operation time, and decreased accuracy, so as to improve the visualization accuracy, improve the prediction effect, and reduce the instability effect.

Active Publication Date: 2018-06-29
SOUTH CHINA UNIV OF TECH
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  • Application Information

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Problems solved by technology

At present, the problems that affect the visualization speed and accuracy of open water spectral imaging technology are: the spectral signal of each pixel point is unstable; the prediction model uses the average spectrum when establishing, and the accuracy of analyzing the pixel point during visualization decreases; The open water body is relatively uniform, and the difference in material content can only be reflected in a large-scale space. It does not require too high a spatial resolution. The more accurate calculation of the entire spectral image increases the calculation time.

Method used

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  • A preprocessing method for spectral imaging visualization of open water detection
  • A preprocessing method for spectral imaging visualization of open water detection
  • A preprocessing method for spectral imaging visualization of open water detection

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Embodiment

[0036] This embodiment applies the spectral imaging visualization pre-processing method for detecting open water bodies to realize the prediction and visualization of chlorophyll content in freshwater water bodies. The specific process is as follows:

[0037] Use 0g / L-40g / L, a series of chlorophyll solutions with a concentration gradient of 2g / L as the basic sample, and collect the spectral image of the sample;

[0038] Use the regression coefficient method to compress the spectrum with low loss and extract the characteristic spectrum;

[0039] The characteristic spectrum is 493, 617, 811, 894nm;

[0040] The BP-ANN prediction model of chlorophyll content was established with characteristic spectral values, and the prediction accuracy of the model was 0.9931.

[0041] First, the spectral imaging visualization preprocessing method for detecting open water bodies is carried out, as follows:

[0042] (1) Taking 3×3 pixels as a unit, the figure 1 The spectral image of the water...

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Abstract

The invention discloses a spectral imaging visualization pre-processing method for detecting open water bodies, which includes the following steps: (1) unitizing the spectral images of water bodies; (2) determining water bodies and non-water bodies for each unit; ( 3) Calculate the spectral difference index D to remove significantly different spectral values; (4) Average the units and reconstruct the spectral image. The method of the present invention improves the prediction effect of the boundary part, improves the visualization accuracy, and increases the visualization speed.

Description

technical field [0001] The invention relates to a visualization preprocessing method for spectral imaging, in particular to a spectral imaging visualization preprocessing method for detecting open water bodies. Background technique [0002] The research on soluble substances, suspended solids, floating solids and other substances in open water is a hot spot in water environment research today. With the development of spectral imaging technology, remote sensing, multispectral, hyperspectral and other spectral imaging technologies are more and more used in the detection of open water bodies. Spectral imaging technology has the advantages of fast analysis speed and the ability to represent the distribution of substances in water body detection by virtue of its characteristics of combining maps and spectra. Among them, the visualization method is a common and intuitive method of expressing the content of certain or several substances in the water body, and it is also a represen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T7/00
CPCG06T7/0004G06T2207/10032G06T2207/20172G06T5/00
Inventor 孙大文曲佳欢蒲洪彬成军虎韩忠
Owner SOUTH CHINA UNIV OF TECH
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