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Hyperspectral imaging device data noise elimination method

A hyperspectral imaging and data technology, applied in image data processing, instruments, image enhancement, etc., can solve hyperspectral imager data signal-to-noise ratio, clarity reduction, hyperspectral imager data quantitative application uncertainty, Little consideration is given to the real characteristics of ground object reflectance, etc., to achieve the effect of small information loss, ensuring the maintenance of ground object characteristics, and complete methods

Active Publication Date: 2013-09-25
CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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Problems solved by technology

[0003] The image data obtained by the hyperspectral imager is a two-dimensional projection display in the three-dimensional scene. Due to the influence of atmospheric radiation transmission, signal acquisition circuit, signal data processing, etc., there are often various types of noise in the hyperspectral imager data. The existence of the hyperspectral imager conceals the real radiation information in the hyperspectral imager data, which reduces the signal-to-noise ratio and definition of the hyperspectral imager data, seriously affects the data quality of the hyperspectral imager, and adversely affects subsequent quantitative remote sensing applications.
At present, there are many methods to remove noise from the hyperspectral imager data, but whether it is based on the spatial domain method or the frequency domain method, it is based on the gray value data of the hyperspectral imager. better display effect, but little consideration is given to the true characteristics of the reflectance of ground objects when the noise is removed, which causes great uncertainty in the quantitative application of hyperspectral imager data

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Embodiment Construction

[0045] Attached below figure 1 , 2 Introduce the realization process of the present invention in detail, concrete steps are as follows:

[0046] (1) Read the remote sensing satellite hyperspectral imager data, preprocess the hyperspectral imager data, and convert the hyperspectral imager data into apparent radiance data; then perform atmospheric correction on the apparent radiance data to obtain Surface albedo data with atmospheric noise removed;

[0047] (1.1) Apparent radiance

[0048] Read the DN value (brightness value of each pixel) data of the hyperspectral imager, and calculate the radiance at the entrance pupil of the hyperspectral imager according to the formula ① according to the absolute calibration coefficient in the file attached to the data, namely the apparent radiance:

[0049] L ( λ ) = DN ( λ ) ...

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Abstract

The invention relates to a hyperspectral imaging device data noise elimination method. The hyperspectral imaging device data noise elimination method includes the following steps: (1) obtaining surface reflectance data removed of the affection of atmospheric noise; (2) selecting a uniform area with relatively stable ground object characteristics, and taking statistics on the statistical characteristic quantity of the surface reflectance data of the area; (3) dividing the band of hyperspectral imaging device data into a smooth data information band, a data information distortion-related band and a data information distortion-irrelated band; (4) respectively eliminating the noise of the data information distortion-related band and the data information distortion-irrelated band; (5) utilizing the actually measured surface reflectance to carry out empirical flat field optimal reflectance transformation on the smooth data information band, the noiseless data information distortion-related band and the noiseless data information distortion-irrelated band in order to eliminate the accumulative noise error in the process of hyperspectral imaging device data processing and finally obtain the noiseless surface reflectance data of a hyperspectral imaging device.

Description

technical field [0001] The invention relates to a noise removal method for hyperspectral imager data, in particular to a noise removal method for environmental disaster reduction satellite hyperspectral imager data. Background technique [0002] The hyperspectral imager data is an "image cube". Its spatial image dimension describes the two-dimensional spatial characteristics of the surface, and its spectral dimension reveals the spectral curve characteristics of each pixel in the image. It obtains rich ground objects with nanoscale spectral resolution Spatial information, radiation information and spectral information, thus realizing the organic fusion of spatial dimension and spectral dimension information of remote sensing data, has great application prospects in remote sensing quantification. [0003] The image data obtained by the hyperspectral imager is a two-dimensional projection display in the three-dimensional scene. Due to the influence of atmospheric radiation tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 王爱春傅俏燕闵祥军潘志强康倩韩启金
Owner CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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