Acta Optica Sinica, Vol. 34, Issue 2, 212001 (2014)
Space Camera Image Motion Measurement Based on Images from Time Delayed Integration Sensors Overlapped Area
Haiqiu Liu1,2,*, Shuyan Xu1, Dong Wang1, Dejie Yan1, and Weixiong Li1
- 1[in Chinese]
- 2[in Chinese]
In order to measure the wide-frequency-range image motion caused by spacecraft attitude instability or residual vibration of the vibration isolation devices, image motion measurement method using images taken from time delayed integration (TDI) sensors, overlapped area is proposed. Offset coefficient is defined to measure the mismatch between image motion velocity and integration time. The relationship between mismatch and image quality using modulation transfer function (MTF) as image quality evaluation index is analyzed. The image motion measuring accuracy range is determined. By taking full advantage of features of the images taken from TDI sensors, overlapped area that have the same content but are taken at the different time, the theory of image motion measurement method based on images taken from TDI sensors, overlapped area is elaborated. Experimental results show that the measurement precision can reach 0.2377 pixel, and the measurement bandwidth can reach 228 Hz, proving that this method can effectively achieve wide-frequency-range, high-precision measurement of image motion.
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