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Diffraction model of a plenoptic camera for in-situ space exploration

Krutz, Ulrike and Lingenauber, Martin and Strobl, Klaus H. and Fröhlich, Florian and Buder, Maximilian (2018) Diffraction model of a plenoptic camera for in-situ space exploration. In: Diffraction model of a plenoptic camera for in-situ space exploration, 10677. Proc. SPIE. SPIE Photonics Europe, 22.-26. April 2018, Straßburg, Frankreich. DOI: 10.1117/12.2306743

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Official URL: http://dx.doi.org/10.1117/12.2306743

Abstract

This paper provides a detailed system theoretical model of a plenoptic camera with the aim to provide in-depth understanding of the plenoptic data recording concept and its effects. Plenoptic cameras, also known as light field cameras, were firstly thought of in the beginning of the 20th century and became recently possible thanks to rapid development of processing hardware and the increase of camera sensor resolution. Despite being a new type of sensor, they are operated in the same way as conventional cameras, but offer several advantages. A plenoptic camera consists of a main lens and a lenslet array (microlens array) right in front of the detector. The microlens array causes not only the recording of the incident location of a light ray on the sensor, as it is done by a conventional camera, but also the incident direction. Such a record can be represented by a 4-D data set known as the light field. In fact, by inserting a microlens array any conventional camera can be transformed into a plenoptic camera. The plenoptic recording concept and the 4-D light field provide multiple advantages over conventional cameras. For example, a single recorded light field allows first, to reconstruct novel views with small changes in viewpoint, second, to create a depth map, and third, to refocus images after the data capture. Hence, the process of focusing is shifted from hardware to software. Last, but not least, plenoptic cameras allow an extended depth of field in comparison to a conventional camera and the use of a bigger camera aperture. Most of the mentioned advantages become particularly effective at close-range to an object. The German Aerospace Center performs research on plenoptic cameras for close-range imaging in space. Possible applications are for example robot vision with plenoptic cameras for robotic arm operations during on-orbit servicing missions or the use of plenoptic cameras on rovers in the course of exploration missions to other planets. Those application scenarios and the demanding conditions in space require thorough comprehension of plenoptic cameras. For this purpose, this paper shall provide a detailed model of plenoptic cameras, which allows to derive camera parameters and optimize them with particular attention to the user requirements and to generate synthetic data. The latter can be utilized to assess the evaluation algorithms, which are not mentioned in detail in this paper. The modeling of the plenoptic camera is mainly based on the theory of geometric optics expanded by elements of diffraction optics.

Item URL in elib:https://elib.dlr.de/120145/
Document Type:Conference or Workshop Item (Poster)
Title:Diffraction model of a plenoptic camera for in-situ space exploration
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Krutz, Ulrikeulrike.krutz (at) dlr.deUNSPECIFIED
Lingenauber, MartinMartin.Lingenauber (at) dlr.deUNSPECIFIED
Strobl, Klaus H.klaus.strobl (at) dlr.deUNSPECIFIED
Fröhlich, FlorianFlorian.Froehlich (at) dlr.deUNSPECIFIED
Buder, Maximilianmaximilian.buder (at) dlr.deUNSPECIFIED
Date:24 May 2018
Journal or Publication Title:Diffraction model of a plenoptic camera for in-situ space exploration
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:10677
DOI :10.1117/12.2306743
Publisher:Proc. SPIE
Series Name:Unconventional Optical Imaging
Status:Published
Keywords:plenoptic imaging, diffraction, microlens array, PSF
Event Title:SPIE Photonics Europe
Event Location:Straßburg, Frankreich
Event Type:international Conference
Event Dates:22.-26. April 2018
Organizer:SPIE
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):LIPA - Lichtfeldkameras für In-situ Planetologie und Astrobiologie
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Real-Time Data Processing
Institute of Robotics and Mechatronics (since 2013) > Perception and Cognition
Deposited By: Krutz, Ulrike
Deposited On:29 May 2018 10:37
Last Modified:31 Jul 2019 20:17

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