Method for calibrating multispectral remote sensing data true colors
A technology of remote sensing data and true color, applied in the field of remote sensing image processing, can solve the problems of color distortion and failure to reflect the real color of ground objects, etc.
Active Publication Date: 2013-08-28
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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In the final analysis, this kind of method is the non-uniformity calibration of the image. Since it is separated from the color formation mechanism of the ground features, only using statistical means to make the colors of the ground features on different images as close as possible can not reflect the true color of the ground features.
According to the characteristics of typical ground features, some studies weighted and recombined the bands of multispectral remote sensing images. For example, for areas with high vegetation coverage, the vegetation index was used to weight the green band in the vegetation area, and then combined with the red and blue bands. Performing true color synthesis can obtain ideal results, but this method can easily cause color distortion of other ground objects in the image
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[0064] The present invention will be further described below in conjunction with an example.
[0065] In this example, the UAV multispectral image acquired in September 2011 is selected as the experimental data. The image has 4 channels, of which the first three channels are blue, green, and red color channels. During image acquisition, targets 11 with various reflectivity and colors were laid on the test site.
[0066] According to the embodiment described in the present invention, first extract the true RGB values of the above-mentioned 11 targets:
[0067] Step 1: According to the spectral reflectance information and atmospheric parameters of sample targets 1-11 measured on site, bring them into the MORTRAN4.0 atmospheric radiation transfer model to obtain the spectral radiance information of the sample targets at the entrance pupil of the detector.
[0068] Step 2: According to the CIE1931 color matching function formula (7), perform weighted integration on the entrance...
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The invention discloses a method for calibrating multispectral remote sensing data true colors and belongs to the technical field of remote sensing image processing. The method can be used for calibrating the multispectral image true colors obtained by aviation and an aerospace sensor platform. According to actual ground object multispectral radiation information, a color matching function is utilized for calculating an RGB value of ground object true colors, the true RGB colors are compared with red, green and blue channel numerical values of the same ground object in the multispectral remote sensing image to build an image true color transition matrix, the transition matrix is utilized for conducting true color calibration on the whole image to obtain a calibration result which is closer to ground object true colors, and the calibration result conforms to visual characteristics of human eyes.
Description
technical field [0001] The invention relates to a method for true-color calibration of multi-spectral remote sensing data, which belongs to the technical field of remote sensing image processing and can be used for true-color calibration of multi-spectral images acquired by aviation and aerospace detector platforms. Background technique [0002] The true color synthesis of multi-spectral remote sensing images means that the color of the ground features on the image after color synthesis is close to the same as the color of the actual ground features, and the synthesized image is suitable for the visual habits of human eyes. True color remote sensing images are widely used in virtual reality, environmental simulation, resource survey, impact interpretation, especially in the use of remote sensing data by non-professionals. At present, the general multi-spectral color synthesis method mostly directly synthesizes the red, green, and blue bands of the multi-spectral image corres...
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IPC IPC(8): G06T7/40
Inventor 李传荣马灵玲苑馨方唐伶俐胡坚李子扬李晓辉朱博吕晓凯
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI