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Fig. 4 | Journal of the European Optical Society-Rapid Publications

Fig. 4

From: Adaptive particle image velocimetry based on sharpness metrics

Fig. 4

Zernike mode amplitude scan of PIV images with introduced defocus by the deformable mirror. a The Z4 scan reveals the correct Z4 RMS value for a sharp image, namely + 2.7 μm. b Z5 scan. c Z6 scan. Except S4 (steepness) all other metrics exhibit a double-peak behavior whose maxima metric values do not correspond to sharp images

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