Time-delay compensation for stabilization imaging system

Yueting Chen; Zhihai Xu; Qi Li; Huajun Feng

doi:10.1117/12.2051893

15 May 2014 Time-delay compensation for stabilization imaging system

Yueting Chen, Zhihai Xu, Qi Li, Huajun Feng

Proceedings Volume 9138, Optics, Photonics, and Digital Technologies for Multimedia Applications III; 91380A (2014) https://doi.org/10.1117/12.2051893
Event: SPIE Photonics Europe, 2014, Brussels, Belgium

Abstract

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.

Citation Download Citation

Yueting Chen, Zhihai Xu, Qi Li, and 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); https://doi.org/10.1117/12.2051893

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KEYWORDS

Motion estimation

Imaging systems

Cameras

High speed cameras

Image processing

Motion measurement

Error analysis

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