Results 81 to 90 of about 3,002 (158)
A nonlocal metasurface for optical edge detection in the far‐field
Nanophotonics, Volume 14, Issue 27, Page 5153-5161, December 2025.Abstract Recent studies on nonlocal metasurfaces have shown possibilities of optical image processing, such as edge detection, without the need for Fourier optics and have significantly reduced the form factor. However, the analog edge detection using nonlocal metasurfaces still requires the use of multiple lenses to image the edge‐enhanced results ...
Doyoon Lee, Huu Lam Phan, Minkyung Kim
wiley +1 more source
Lensless imaging based on coherent backscattering in random media
AIP Advances, 2014 We studied lensless imaging due to coherent backscattering in random media both theoretically and experimentally. The point spread function of the lensless imaging system was derived.
Lei Xu +5 more
doaj +1 more source
Developing an End‐to‐End 3D X‐Ray Ptychography Workflow Using Surrogate Models
Concurrency and Computation: Practice and Experience, Volume 37, Issue 25-26, 30 November 2025.ABSTRACT Recently, X‐ray ptychography has attracted significant attention as a non‐destructive imaging technique with high spatial resolution. However, its application to real‐time imaging is limited by the long execution time required for iterative phase retrieval, which reconstructs sample images from diffraction patterns. To address this issue, deep
Ryota Koda +4 more
wiley +1 more source
Unrolled primal-dual networks for lensless cameras
, 2022 Conventional models for lensless imaging assume that each measurement results from convolving a given scene with a single experimentally measured point-spread function.
Kingshott, O +3 more
core
Active metasurface designs for lensless and detector‐limited imaging
Nanophotonics, Volume 14, Issue 23, Page 3871-3888, 02 November 2025.Abstract The emergence of metasurfaces has enabled lightweight, compact imaging with degrees of freedom which previously required complex optical setups to achieve, such as polarization, wave vector, and spectrum. To date, most metasurface‐enabled imaging systems have thus far been ‘passive’, and therefore subject to fundamental information and ...
Julie Belleville +2 more
wiley +1 more source
Lensless photography with only an image sensor
Applied Optics, 2017 Photography usually requires optics in conjunction with a recording device (an image sensor). Eliminating the optics could lead to new form factors for cameras. Here, we report a simple demonstration of imaging using a bare CMOS sensor that utilizes computation.
Ganghun Kim +3 more
openaire +4 more sources
Privacy-Enhancing Optical Embeddings for Lensless Classification [PDF]
Lensless imaging can provide visual privacy due to the highly multiplexed characteristic of its measurements. However, this alone is a weak form of security, as various adversarial attacks can be designed to invert the one-to-many scene mapping of such ...
Simeoni, Matthieu +2 more
core
Implementing Lensless Cameras in Autonomous Robotic Systems [PDF]
, 2014 The open-source Robot Operating System (ROS) is a mixed and scalable P2P network-based robotics framework. We examine lensless compressive imaging using a hardware apparatus assembly having an imaging sensor, but no lens.
Tomović, Aleksandar
core
Multiple Point-Source Tracking With Lensless Single Random Phase Encoding Optical Systems
IEEE AccessIn this paper, we demonstrate the capability of a lensless single random phase encoding (SRPE) system to track the lateral motion of multiple moving point-sources using a Probability Hypothesis Density (PHD) filter. Our system consists of an image sensor
Saurabh Goswami +3 more
doaj +1 more source
Accommodation in the Lensless Eye [PDF]
American Journal of Ophthalmology, 1919 This discussion of apparent accommodation after removal of the lens is based upon the case of a woman, aged 73, who had been subjected to cataract extraction. Read before the American Ophthalmological Society, June 17, 1919. (See p. 881.)
openaire +1 more source