11 November 2014 Measurement of sub-pixel image motion based on joint transform correlator
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Abstract
An effective approach to measure image motion is presented based on joint transform correlator(JTC), in order to measure the sub-pixel image motion caused by satellite attitude instability or vibration. Firstly, the high-speed CCD is used to capture image sequences, which are preprocessed by wavelet edge detection. Next the acquired image edge sequences are optically calculated by JTC, and an improved correlation peak is obtained. Lastly a modified centroid algorithm is proposed to get more accurate motion measurement. Motion measurement based on optical correlation is discussed, and the optical experiment system is also set up. The experimental results show that the measurement error is as low as 0.02 pixels, the accuracy is improved greatly.
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Xue-ting Hong, Xue-ting Hong, Yi-xian Qian, Yi-xian Qian, Xiao-wei Shi, Xiao-wei Shi, Deng-hui Li, Deng-hui Li, } "Measurement of sub-pixel image motion based on joint transform correlator", Proc. SPIE 9271, Holography, Diffractive Optics, and Applications VI, 92711Y (11 November 2014); doi: 10.1117/12.2070807; https://doi.org/10.1117/12.2070807
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