Results 71 to 80 of about 1,860,088 (200)

Ptychography & lensless X-ray imaging [PDF]

Europhysics News, 2008
If an object is illuminated with coherent electromagnetic radiation, e.g., by visible laser light or highly brilliant x-rays, a diffraction pattern is formed in the Fraunhofer far field that is related via a Fourier transform to the optical transmission function of the object.The aim of coherent diffractive imaging (CDI), or so-called lensless imaging,
Martin Dierolf, Oliver Bunk, Søren Kyndel, Pierre Thibault, Ian Johnson, Andreas Menzel, Konstantins Jefimovs, Christian David, Othmar Marti, Franz Pfeiffer   +9 more
openaire   +3 more sources

Exploiting Scattering‐Based Point Spread Functions for Snapshot 5D and Modality‐Switchable Lensless Imaging

Laser &Photonics Reviews, Volume 20, Issue 5, 6 March 2026.
This paper demonstrates a snapshot 5D and modality‐switchable lensless camera (Diffuser‐mCam), which can encode 2D intensity, multi‐spectral, polarization, and time information into a monochromatic raw data, and subsequently decode it using the compressed sensing algorithm at the sampling rate of 2.5% per channel.
Ze Zheng, Baolei Liu, Jiaqi Song, Muchen Zhu, Chi Han, Yao Wang, Menghan Tian, Ying Xiong, Zhaohua Yang, Xiaolan Zhong, David McGloin, Fan Wang   +11 more
wiley   +1 more source

On the diffraction limit for lensless imaging

Journal of Research of the National Institute of Standards and Technology, 1999
The diffraction limit for lensless imaging, defined as the sharpest possible point image obtainable with a pinhole aperture, is analyzed and compared to the corresponding limit for imaging with lenses by means of theoretical considerations and numerical computations using the Fresnel-Lommel diffraction theory for circular apertures.
openaire   +1 more source

Comparing image quality of synchrotron and laboratory nano‐CT scans: a round robin study

Journal of Synchrotron Radiation, Volume 33, Issue 2, Page 489-507, March 2026.
A multi‐facility round‐robin comparison of synchrotron‐ and laboratory‐based nano‐computed tomography using a standardized 3D phantom reveals superior resolution and acquisition speed at synchrotrons, while advanced laboratory systems achieve competitive image quality with extended scan times; phase contrast modalities further enhance structural ...
Simon Wittl, Simon Zabler, Jonas Fell, Julie Villanova, Pierre Lhuissier, Stefanie Hildebrandt, Hans-Georg Herrmann   +6 more
wiley   +1 more source

Investigating the performance of regular two-dimensional grating in a lensless system

Heliyon
In this study, we investigate the use of a regular two-dimensional (2D) grating as an encoded mask in a lensless imaging system, a novel approach in the field of computational imaging.
A. Hosseinzadegan, E. Mohajerani, M. Dashtdar   +2 more
doaj   +1 more source

Deeply coded aperture for lensless imaging

Optics Letters, 2020
In this Letter, we present a method for jointly designing a coded aperture and a convolutional neural network for reconstructing an object from a single-shot lensless measurement. The coded aperture and the reconstruction network are connected with a deep learning framework in which the coded aperture is placed as a first convolutional layer.
Ryoichi Horisaki, Yuka Okamoto, Jun Tanida   +2 more
openaire   +2 more sources

Adaptively coupled phase retrieval in multi‐peak Bragg coherent diffraction imaging

Journal of Applied Crystallography, Volume 59, Issue 1, Page 40-48, February 2026.
We present an adaptively coupled phase retrieval algorithm for multi‐peak Bragg coherent diffraction imaging. The technique uses the redundant information contained in separate Bragg peaks to detect and remove spurious signal.Recent advances in Bragg coherent diffraction imaging (BCDI) experimental techniques permit routine measurement of multiple ...
J. Nicholas Porter, Yueheng Zhang, Ross J. Harder, Barbara Frosik, Wonsuk Cha, Yuan Gao, Garth Williams, Joshua Miller, Nash Karrington, Andres Herrera, Anthony Rollett, Stephan Hruszkewycz, Richard L. Sandberg   +12 more
wiley   +1 more source

Machine Learning Based Single-Frame Super-Resolution Processing for Lensless Blood Cell Counting

Sensors, 2016
A lensless blood cell counting system integrating microfluidic channel and a complementary metal oxide semiconductor (CMOS) image sensor is a promising technique to miniaturize the conventional optical lens based imaging system for point-of-care testing (
Xiwei Huang, Yu Jiang, Xu Liu, Hang Xu, Zhi Han, Hailong Rong, Haiping Yang, Mei Yan, Hao Yu   +8 more
doaj   +1 more source

Techniques and Advances in Ultrafast Photography

Advanced Photonics Research, Volume 6, Issue 12, December 2025.
This review maps the fast‐growing field of ultrafast photography from early mechanical cameras to modern optical‐computational methods. It organizes techniques into four families (multishot passive/active; single‐shot passive/active), explains how they reach trillion‐frame‐per‐second speeds, compares capabilities and tradeoffs, and highlights ...
Chen Huang, Xin Zhang, Renjie Han, Jiaoyu Fan, Hui Jiang, Yiwen Zhang, Jinghua Yu, Jiamin Wang, Yi Chen, Junjie Sun, Fei Chen   +10 more
wiley   +1 more source

LenslessPiCam: A Hardware and Software Platform for Lensless Computational Imaging with a Raspberry Pi [PDF]

, 2022
Lensless imaging seeks to replace/remove the lens in a conventional imaging system. The earliest cameras were in fact lensless, relying on long exposure times to form images on the other end of a small aperture in a darkened room/container (camera ...
Simeoni, Matthieu, Bezzam, Eric, Kashani, Sepand, Vetterli, Martin   +3 more
core   +1 more source