I’m currently working on using optical 4-f systems to perform cross-correlations. There’s an interesting similarity with deep learning Conv2D networks. Here’s a link to our work in progress paper at SPIE https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11356/2554021/Implementations-and-optimisations-of-optical-Conv2D-networks-designs/10.1117/12.2554021.short?SSO=1
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