With the increasing of the line frequency in the field of high resolution space remote sensing, the energy of the camera decreases gradually in an integral time, and the imaging ability of the camera in weak light decreases. Therefore, it is necessary to increase the number of TDI stages to make up for the lack of energy. The existing traditional digital domain accumulation will inevitably lead to excessive noise, while the charge domain is affected by sensor process, it can not achieve large series accumulation. This paper first proposes an accumulation method based on the hybrid of charge domain and digital domain. The main indexes that affect the image quality of weak light imaging are analyzed. Then,aiming at the degradation of image quality between multi sensitive units under the mode of hybrid domain accumulation, an imaging time adjustment method based on image registration is proposed. This method can effectively improve the mismatch between the charge motion and the scene motion. Finally, through the roller target test in the laboratory and the location imaging, this paper verifies the effectiveness of the imaging time adjustment method and the enhancement effect of imaging ability under weak light. The results show that the proposed method can effectively solve the main bottleneck problem of ultra-high resolution imaging in charge domain and digital domain, This paper provides an effective solution for the development of ultra-high resolution camera in the future.
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