CCD camera response non-uniformity correction method for realizing dark current compensation

Abstract

The invention discloses a multichannel CCD camera response non-uniformity correction method and device for realizing dark current compensation, an apparatus and a computer readable storage medium. Themethod comprises the steps of calculating the dark current characteristic parameters of a multichannel CCD camera in advance based on a ground radiation calibration method to serve as correction parameters, and storing all the correction parameters in a nonvolatile memory; acquiring a current temperature value of a multichannel CCD camera detector and a preset integral time parameter value; and based on the current temperature value and the integral time parameter value, calculating a non-uniformity correction coefficient of each pixel by utilizing each correction parameter so as to correct the gray value of the output image in real time. According to the invention, the problem that the correction of the output image by using the fixed correction parameters in related technologies cannotbe suitable for an application scene with the changed dark current, is solved; the CCD camera response non-uniformity correction of dark current compensation can be realized, the CCD camera response non-uniformity correction effect is improved, and a high-quality and high-resolution output image can be obtained.

Description

technical field [0001] The present application relates to the technical field of space optical remote sensing imaging, in particular to a multi-channel CCD camera response non-uniformity correction method and device for realizing dark current compensation. Background technique [0002] With the continuous improvement of application requirements, the requirements for imaging width, imaging resolution and other indicators required for space remote sensing to ground imaging are also getting higher and higher. In order to meet the requirements of high-resolution and large-width imaging, it is necessary to adopt a larger array of imaging detectors. However, due to the limitation of the manufacturing process, it is difficult for a single detector to meet the application requirements. Therefore, multi-detector splicing is usually used at present. At the same time, for TDI CCD detectors, in order to meet the high transfer line frequency requirements of push-broom imaging in lower or...

AI Technical Summary

Problems solved by technology

[0004] It can be understood that the digital correction coefficient obtained through the ground calibration process is suitable for the calibration working parameter conditions, especially the working temperature and integration time that affect the dark current of the detector. When the on-orbit imaging needs to adjust these two parameters , it will lead to changes in the dark current, and if the original digital correction coefficient is still used, there will be an obvious mismatch, resulting in poor non-uniformity correction effect

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