15 May 2014 Time-delay compensation for stabilization imaging system
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The spatial resolution of imaging systems for airborne and space-borne remote sensing are often limited by image degradation resulting from mechanical vibrations of platforms during image exposure. A straightforward way to overcome this problem is to actively stabilize the optical axis or drive the focal plane synchronous to the motion image during exposure. Thus stabilization imaging system usually consists of digital image motion estimation and micromechanical compensation. The performance of such kind of visual servo system is closely related to precision of motion estimation and time delay. Large time delay results in larger phase delay between motion estimation and micromechanical compensation, and leads to larger uncompensated residual motion and limited bandwidth. The paper analyzes the time delay caused by image acquisition period and introduces a time delay compensation method based on SVM (Support Vector Machine) motion prediction. The main idea to cancel the time delay is to predict the current image motion from delayed measurements. A support vector machine based method is designed to predict the image motion. A prototype of stabilization imaging system has been implemented in the lab. To analyze the influences of time delay on system performance and to verify the proposed time delay cancelation method, comparative experiments over various frequencies of vibration are taken. The experimental results show that, the accuracy of motion compensation and the bandwidth of the system can be significantly improved with time delay cancelation.
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Yueting Chen, Yueting Chen, Zhihai Xu, Zhihai Xu, Qi Li, Qi Li, Huajun Feng, Huajun Feng, "Time-delay compensation for stabilization imaging system", Proc. SPIE 9138, Optics, Photonics, and Digital Technologies for Multimedia Applications III, 91380A (15 May 2014); doi: 10.1117/12.2051893; https://doi.org/10.1117/12.2051893

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