Acta Optica Sinica, Volume. 37, Issue 11, 1111001(2017)

Non-Uniformity Correction for Multi-Channel TDI CCD Imaging System in Wide Response Range

Liangliang Zheng1,2、*, Guang Jin1, Hongsong Qu1, and Guixiang Zhang1
Author Affiliations
  • 1 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, China
  • 2 University of Chinese Academy of Sciences, Beijing 100049, China
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    There is a problem of non-uniformity response between multiple channels for a time-delayed integration (TDI) charge-coupled device (CCD) imaging system. Due to this problem, a correction method research based on radiometric calibration is conducted. A theoretical model for correction is deduced according to the flow of signal processing. A correction method is proposed based on weighted least square, which needs to acquire three sets of image data in 1/4, 1/2 and 3/4 saturation. Three sets of correction parameters are fitted by weighted least square using Gaussian weighting function to achieve the optimized parameters. The experimental verification is carried out using a TDI CCD imaging system. The results show that the photo response non-uniformity reduces from 4.09% to 0.85%, which is better than 1.93% obtained by two-point correction method. And it has a good performance in wide response range with advantages of high precision and good practicability. This method can be applied in many kinds of airborne or spaceborne camera payloads and lay the technical foundation to achieve high-quality remote sensing image data.

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    Liangliang Zheng, Guang Jin, Hongsong Qu, Guixiang Zhang. Non-Uniformity Correction for Multi-Channel TDI CCD Imaging System in Wide Response Range[J]. Acta Optica Sinica, 2017, 37(11): 1111001

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    Paper Information

    Category: Imaging Systems

    Received: May. 22, 2017

    Accepted: --

    Published Online: Sep. 7, 2018

    The Author Email: Zheng Liangliang (adqe@163.com)

    DOI:10.3788/AOS201737.1111001

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