UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

Extending the depth of field for ptychography using complex-valued wavelets

Huang, X; Yan, H; Robinson, IK; Chu, YS; (2019) Extending the depth of field for ptychography using complex-valued wavelets. Optics Letters , 44 (3) pp. 503-506. 10.1364/OL.44.000503. Green open access

[img]
Preview
Text
Robinson_Xiaojing_Opt_Lett_accepted_2019.pdf - ["content_typename_Published version" not defined]

Download (592kB) | Preview

Abstract

Ptychography is a scanning variation of the coherent diffractive imaging method for providing high-resolution quantitative images from specimen with extended dimensions. Its capability of achieving diffraction-limited spatial resolution can be compromised by the sample thickness, which is generally required to be thinner than the depth of field of the imaging system. In this Letter, we present a method to extend the depth of field for ptychography by numerically generating the focus stack from reconstructions with propagated illumination wavefronts and combining the in-focus features to a single sharp image using an algorithm based on the complex-valued discrete wavelet transform. This approach does not require repeated measurements by translating the sample along the optical axis as in the conventional focus stacking method, and offers a computation-efficient alternative to obtain high-resolution images with extended depth of fields, complementary to the multi-slice ptychography.

Type: Article
Title: Extending the depth of field for ptychography using complex-valued wavelets
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/OL.44.000503
Publisher version: http://doi.org/10.1364/OL.44.000503
Language: English
Additional information: Provided under the terms of the OSA Open Access Publishing Agreement. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10068135
Downloads since deposit
0Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item