Optics and Precision Engineering, Volume. 23, Issue 11, 3219(2015)
Influence of electronic nonlinearities of space camera on MTF and their discriminance
The electronics system in a remote sensing camera will generate V/Q nonlinearity and DN/V nonlinearity in signal conversion processing and both of them effect the Modulation Transform Function(MTF) of the sub-imaging system. This paper focuses on the generation mechanism of two kinds of electronic nonlinearities and the effects of the nonlinearities on the MTF and proposes a discriminant method for the electronic nonlinearities. On the basis of the generation mechanism, the V/Q and DN/V nonlinearity theoretical models are established, their effects on the MTF of the camera are researched and a simulation experiment is performed. Experimentl results show that the MTF falls with electronic nonlinearity from 0.55 under a normal state to 0.47, and it also changes with illumination. Finally, a method based on combination of a video response curve and a Photo-response Non-uniformity (PRNU) noise curve is proposed to distinguish the V/Q nonlinearity and DN/V nonlinearity. The simulation is put forward and the feasibility of the proposed method is verified。 The research provides strong supports for the design, improvement and nonlinearity compensation of remote sensing cameras.
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LI Jun-lin, GUO Yong-fei, LI Jing-qiu, LAN Tai-ji. Influence of electronic nonlinearities of space camera on MTF and their discriminance[J]. Optics and Precision Engineering, 2015, 23(11): 3219
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Received: Dec. 9, 2014
Accepted: --
Published Online: Jan. 25, 2016
The Author Email: Jun-lin LI (lijunlin0913@126.com)