DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Automatic Label Completion for Test Field Calibration

Hieronymus, Jan (2014) Automatic Label Completion for Test Field Calibration. ISPRS Technical Commission V Symposium, 2014-06-23 - 2014-06-25, Riva del Garda, Italy. doi: 10.5194/isprsannals-II-5-167-2014.

[img] PDF

Official URL: http://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/II-5/167/2014/isprsannals-II-5-167-2014.html


For geometric camera calibration using a test field and bundle block adjustment it is crucial to identify markers in images and label them according to a known 3D-model of the test field. The identification and labelling can become challenging, especially when the imaging system incorporates strong unknown distortion. This paper presents an algorithm, that automatically completes the labelling of unlabelled anonymous marker candidates given at least three labelled markers and a labelled 3D-model of the test field. The algorithm can be used for extracting information from images as a pre-processing step for a subsequent bundle block adjustment. It identifies an unlabelled marker candidate by referencing it to two, three or four already labelled neighbours, depending on the geometric relationship between the reference points and the candidate. This is achieved by setting up a local coordinate system, that reflects all projection properties like perspective, focal length and distortion. An unlabelled point is then represented in this local coordinate system. These local coordinates of a point are very similar in the corresponding 3D-model and in the image, which is the key idea of identifying an unlabelled point. In experiments the algorithm proofed to be robust against strong and unknown distortion, as long as the distortion does not change within a small sub-image. Furthermore no preliminary information about the focal length or exterior orientation of the camera with respect to the test field is needed.

Item URL in elib:https://elib.dlr.de/95085/
Document Type:Conference or Workshop Item (Speech)
Title:Automatic Label Completion for Test Field Calibration
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Hieronymus, JanHumboldt Universität zu BerlinUNSPECIFIEDUNSPECIFIED
Date:28 May 2014
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 167-172
Series Name:ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Keywords:Targets Identification Automation, Geometric Camera Calibration, Distortion, Image Processing
Event Title:ISPRS Technical Commission V Symposium
Event Location:Riva del Garda, Italy
Event Type:international Conference
Event Start Date:23 June 2014
Event End Date:25 June 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Vorhaben Optische Sensorik - Theorie, Kalibration, Verifikation (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Optics, Calibration and Validation
Deposited By: Hieronymus, Jan
Deposited On:08 Feb 2016 06:44
Last Modified:24 Apr 2024 20:00

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.