A Physical Color Uniform Method for Satellite Remote Sensing Imagery

Abstract

The present invention discloses a physical color equalization method for satellite remote sensing images, specifically: 1) using a cross-calibration method, using the Dunhuang radiation correction field as a transfer platform, and using the MODIS image as a reference benchmark to obtain the GF-1 satellite WFV sensor The absolute radiation calibration coefficient of a certain camera; 2) Use statistical analysis methods to establish a correlation model for the DN values ​​of adjacent camera images; 3) Use simulation methods to establish a correlation model for the apparent radiance of adjacent camera images; 4) Establish a self-intersection The radiometric calibration model realizes absolute radiometric calibration of other cameras; 5) Use the calibration coefficients of each camera to convert the image DN value into apparent radiance, thereby achieving physical color uniformity of the image. Compared with traditional color balancing methods, this method achieves physical color balancing between cameras without destroying the original image radiation information.

Description

technical field [0001] The invention relates to the field of aerospace remote sensing satellites, in particular to a method for physically uniforming the color of satellite remote sensing images. Background technique [0002] In order to ensure that satellite sensors can not only acquire high spatial resolution satellite images, but also have wide-coverage earth observation capabilities, people often use the method of multi-camera stitching to achieve this goal. For example, the wide-coverage WFV sensor carried by the GF-1 satellite uses 4 camera stitching imaging technology, such as figure 1 As shown, the overall development goal of combining high resolution and large field of view has been achieved, and it can acquire satellite images with a spatial resolution of 16m and a width better than 800km. However, due to the differences in the relevant parameters of each camera (camera observation angle, camera spectral response function, etc.), there is a more obvious problem of...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the fact that the existing algorithm cannot meet the requirement of not destroying the original radiation information of the satellite image, the present invention proposes a method for physical color uniformity of the image based on cross-radiation calibration. This method does not change the radiation information of the original image. At the same time, it can effectively reduce the problem of radiation inconsistency in overlapping areas of adjacent camera images, and realize physical color uniformity of images

Images