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Image processing has become a critical technology in a variety of science andengineering disciplines. While most image processing is performed digitally,optical analog processing has the advantages of being low-power and high-speedthough it requires a large volume. Here, we demonstrate optical analog imagingprocessing using a flat optic for direct image differentiation allowing one tosignificantly shrink the required optical system size. We first demonstrate howthe image differentiator can be combined with traditional imaging systems suchas a commercial optical microscope and camera sensor for edge detection.Second, we demonstrate how the entire analog processing system can be realizedas a monolithic compound flat optic by integrating the differentiator with ametalens. The compound nanophotonic system manifests the advantage of thin formfactor optics as well as the ability to implement complex transfer functionsand could open new opportunities in applications such as biological imaging andmachine vision.

Image Processing Based on Compound Flat Optics