Chenliang Li, Xinqi Hu. Study on Centroid-of-Correlation-Function Approach for Estimating Sub-Image Shifts in Extended Scene Shack-Hartmann Wavefront Sensor[J]. Acta Optica Sinica, 2017, 37(9): 0928003
- Acta Optica Sinica
- Vol. 37, Issue 9, 0928003 (2017)
Fig. 1. Parabolic interpolation at sub-pixel peak position of correlation function
Fig. 2. Original image(640 pixel×640 pixel)
Fig. 3. Image after reducing resolution(64 pixel×64 pixel)
Fig. 4. Errors of the correlated centroid algorithm versus window size and threshold of correlation function under different signal-to-noise ratios. (a) RSN=1∶1; (b) RSN=2∶1; (c) RSN =3∶1; (d) RSN=5∶1
Fig. 5. Errors comparison of centroid algorithm and parabolic interpolation algorithm under different signal-to-noise ratios.(a) RSN=2∶1; (b) RSN=3∶1; (c) RSN=5∶1; (d) without noise
Fig. 6. Schematic diagram of the experimental optical paths
Fig. 7. Object image obtained on CCD
Fig. 8. Comparison of estimated errors in the experiment
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