Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Image Processing Based on Compound Flat Optics   Image processing has become a critical technology in a variety of science and
engineering disciplines. While most image processing is performed digitally,
optical analog processing has the advantages of being low-power and high-speed
though it requires a large volume. Here, we demonstrate optical analog imaging
processing using a flat optic for direct image differentiation allowing one to
significantly shrink the required optical system size. We first demonstrate how
the image differentiator can be combined with traditional imaging systems such
as a commercial optical microscope and camera sensor for edge detection.
Second, we demonstrate how the entire analog processing system can be realized
as a monolithic compound flat optic by integrating the differentiator with a
metalens. The compound nanophotonic system manifests the advantage of thin form
factor optics as well as the ability to implement complex transfer functions
and could open new opportunities in applications such as biological imaging and
machine vision.

18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat