Side-slither radiometric calibration processing method based on histogram equalization

Abstract

The invention discloses a side-slither radiometric calibration processing method based on histogram equalization. The method comprises the steps of (1) selecting original calibration data, conducting translation processing on the original calibration data, and extracting effective calibration data; (2) calculating a standard accumulative histogram of all the detection units according to the effective calibration data extracted from the step (1) to further obtain an accumulative histogram of each detection unit; (3) establishing a relative radiometric calibration lookup table according to the accumulative histograms obtained from the last step and a laboratory relative radiometric calibration model; (4) conducting relative radiometric calibration on an original image by means of the lookup table. According to the method, the applicability of side-slither calibration is improved, and side-slither relative radiometric calibration based on histogram equalization is achieved.

Description

technical field [0001] The invention relates to a side-slither radiation calibration processing method based on histogram balance. Background technique [0002] In order to obtain high-quality remote sensing images, relative radiometric calibration is required for aerospace optical remote sensing cameras. For push-broom imaging optical remote sensing satellites with strong agility, when performing on-orbit relative radiometric calibration, the method of rotating the camera around the satellite yaw axis by a certain angle (usually 90°) can be used to obtain a relatively uniform image. method to perform non-uniformity correction between different pixels. This method of on-orbit relative radiometric calibration is called "side-slither". [0003] The schematic diagram of the side-slither calibration method is attached figure 1 shown. In the normal imaging mode of the push-broom optical remote sensing camera, the focal plane detector line is perpendicular to the imaging direc...

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Problems solved by technology

[0005] Philippe KUBIK uses a method based on histogram equalization to process the side-slither calibration data of Pleiades-HR to perform relative radiation correction, but this method has two shortcomings: 1) The linear response model of the actual imaging system is the same as that used by Philippe KUBIK The model is not consistent (Philippe KUBIK's linear model: at the low end DNs When it is a linear response model, in the middle and high end DN>DN s is a linear response model); 2) It is difficult for the imaging area to cover the response low-end DNs , the low-end correction effect cannot be guaranteed at this time

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