Measurement of sub-pixel image shifts based on hybrid photoelectric joint transform correlator

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Fan Chao Measurement of sub-pixel image shifts based on hybrid photoelectric joint transform correlator (Измерение сдвигов изображения с субпиксельной точностью с использованием гибридного фотоэлектрического измерителя взаимной корреляции) [на англ. яз.] // Оптический журнал. 2017. Т. 84. № 8. С. 70–76.

Fan Chao Measurement of sub-pixel image shifts based on hybrid photoelectric joint transform correlator (Измерение сдвигов изображения с субпиксельной точностью с использованием гибридного фотоэлектрического измерителя взаимной корреляции) [in English] // Opticheskii Zhurnal. 2017. V. 84. № 8. P. 70–76.

For citation (Journal of Optical Technology):

Fan Chao, "Measurement of sub-pixel image shifts based on a hybrid photoelectric joint transform correlator," Journal of Optical Technology. 84(8), 562-567 (2017). https://doi.org/10.1364/JOT.84.000562

Abstract:

In order to measure the sub-pixel image shifts of the remote sensing camera which induced by the vibration, the scrolling, the orbit regulation of the satellite, and so on, the photoelectric hybrid joint transform correlator is used. The adjacent two frames of the sequential remote sensing images are correlated by the joint transform correlator, and the joint power spectrum is processed by the Laplace transform to get the sharp shrinking crosscorrelation peaks, then the coordinate of which is searched by the centroid method, and the image shifts can be measured accurately. In this paper, the measurement principle of the image shifts based on the joint transform correlator is given firstly, then the shifted image sequence is obtained by interpolation and down sampling, and the measurement results are simulated. Lastly, considering the relationship between the components of the joint transform correlator, the experiment platform is built and the image shifts is measured. The results shown that, the image shifts can be measured accurately, and the measurement error is less than 0.075 pixel.

Keywords:

optical correlator, image shifts, sub-pixel, Laplace transform, measurement

Acknowledgements:

This project is supported by the science and technology support project of the State Grain Administration (No. 201413001), the China Scholarship Council (No. 201408410255), and the Natural Science Foundation of Henan Province (162300410062).

OCIS codes: 070.4550

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