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18 June 2024 Compensating aberrations in Doppler holography of the human eye fundus through computed sub-aperture signal correlation
Zofia Bratasz, Olivier Martinache, Yohan Blazy, Michael Atlan, Julia Sverdlin, Vincent Borderie, Katharine Grieve, Damien Gatinel
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Proceedings Volume PC12996, Unconventional Optical Imaging IV; PC129960G (2024) https://doi.org/10.1117/12.3017577
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
Holographic retinal imaging can be affected by optical distortions from the eye and lenses. A digital Shack-Hartmann algorithm corrects this by splitting the Fourier plane into sub-apertures to measure local wavefront gradients via cross-correlation of sub-images. We examine wavefront regularization by Zernike polynomials for better aberration correction, and introduce a new method for calculating retinal image shifts. Using the entire computed image as a reference, rather than just the central sub-image, minimizes bias. Furthermore, we use a direct wavefront reconstruction approach, using overlapping sub-apertures and a 2D gradient integration algorithm to estimate the wavefront without regularization. Our findings show that this direct wavefront estimation enhances image resolution and contrast for Doppler holography of the eye fundus compared to wavefront regularization by Zernike polynomials.
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Zofia Bratasz, Olivier Martinache, Yohan Blazy, Michael Atlan, Julia Sverdlin, Vincent Borderie, Katharine Grieve, and Damien Gatinel "Compensating aberrations in Doppler holography of the human eye fundus through computed sub-aperture signal correlation", Proc. SPIE PC12996, Unconventional Optical Imaging IV, PC129960G (18 June 2024); https://doi.org/10.1117/12.3017577
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KEYWORDS
Wavefronts
Holography
Aberration correction
Eye
Doppler effect
Reconstruction algorithms
Digital holography
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