Optics and Precision Engineering, Volume. 19, Issue 11, 2800(2011)
Design of temperature adaptability for video processing in high-resolution remote sensing cameras
To obtain high quality images for remote sensing cameras in a wider temperature change or in the temperature diversity caused by different circuit parts, an adaptive method for imaging electronics was proposed. The time-delay factors of temperature in the imaging system was analyzed, and design methods for temperature adaptability and the initial alignment of Corrlated Double Sampling(CDS) positions were given. Several experiments were performed to validate the feasibility of this method. By proposed method, the output of CCD driver was divided and was taken as a benchmark for the CDS signals, so that CDS signals can be used to track the driving signal adaptively. Then, initial positions of CDS were precisely aligned by using the lowpass filtering of a RC net. Finally, a temperature experiment by proposed compensating method was carried out for the imaging system of remote camera in -35~75 ℃. Results indicate that the position precision of CDS signals after adjusting is up to 0.2 ns. In the experimental temperature range, the maximal deviation of the CDS signals is only 072 ns as comparing with that of ideal one, which satisfies the indicators of image quality and the requirements of space application.
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QU Li-xin. Design of temperature adaptability for video processing in high-resolution remote sensing cameras[J]. Optics and Precision Engineering, 2011, 19(11): 2800
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Received: Mar. 1, 2011
Accepted: --
Published Online: Dec. 5, 2011
The Author Email: Li-xin QU (qulx2007@163.com)