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Relative radiation correction method for star-load TDICCD camera

A technology of relative radiometric correction and relative radiometric calibration, which is applied in image data processing, instruments, radio wave measurement systems, etc., and can solve problems such as the inability to correct the non-linearity of tap light intensity response

Active Publication Date: 2010-01-27
AEROSPACE DONGFANGHONG SATELLITE
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Problems solved by technology

[0008] The technical problem of the present invention is: to overcome the deficiency of the prior art that only performs linear or piecewise linear radiation correction, and to provide a relative radiation correction method that integrates the nonlinear correction of each tap response of TDICCD, which solves the problem of existing radiation calibration The method cannot correct the non-linear problem of tap response to light intensity, which can significantly improve the relative radiometric calibration accuracy and the non-uniformity correction effect of remote sensing images

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Embodiment Construction

[0053] The TDICCD of this embodiment has 24 taps in total, each tap has 512 pixels, and there are 12288 pixels in total, assuming that there are images of the camera at p different brightnesses (16 levels in this example), and the image length is n.

[0054] According to the push-broom imaging principle of TDICCD, the radiation calibration data is processed one-dimensionally. Figure 1 shows the grayscale image of the calibration original data and the one-dimensional image of each pixel response at a certain brightness level. Figure 1a Calibrated raw data grayscale image (two-dimensional image) for TDICCD imaging, Figure 1b It is the response map of each pixel after the one-dimensionalization of the two-dimensional image, and the one-dimensionalization process of the data is as follows:

[0055] X i k = 1 n Σ j = ...

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Abstract

Disclosed is a relative radiometric correction method for the satellite-borne TDICCD camera. The steps comprises (1) analyzing the response output of a tapping under different light intensities and acquiring a scatter diagram of tapping light intensity response, (2) carrying out linear fitting to the scatter diagram of tapping light intensity response, then carrying out linear interpolation to the scatter diagram to obtain an interpolation curve, subtracting the interpolation curve of each tapping from respective fitting line to obtain a non-linear modified function of the tapping to light intensity, (3) using the non-linear modified function to carry out non-linear modification one after another to tapping of radiometric calibration data, and obtaining modified radiometric calibration data, (4) processing the modified radiometric calibration data and obtaining a modified inter- calibration coefficient, (5) carrying out radiation homogeneousness correction to arbitrary image produced by TDICCD via using the non-linear modified function and the modified inter- calibration coefficient. The invention resolves the problem that non-linear response to light intensity of the tapping can not be corrected in existing radiometric calibration method, and can increase relative radiometric calibration accuracy.

Description

technical field [0001] The invention relates to a relative radiation correction method of a remote sensing satellite TDICCD camera, in particular to a relative radiation uniformity correction method based on tap fitting and analysis. Background technique [0002] Generally, remote sensing satellites need to conduct multiple radiation calibration tests on the remote sensor (here, the TDICCD camera) on the ground. In order to improve the satellite's processing efficiency of a large number of calibration data and the effect of radiation uniformity correction, and evaluate the relative calibration accuracy of remote sensors, a method of camera radiation calibration data processing, image non-uniformity correction and relative calibration in the whole satellite state is proposed. A new method for precision analysis. [0003] With the improvement of the field of view, spatial resolution, and width of the space camera, in order to meet the requirements of large field of view and w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G01S7/497
Inventor 朱兴鸿陆春玲李琳琳
Owner AEROSPACE DONGFANGHONG SATELLITE
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