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Inlining 3D Reconstruction, Multi-Source Texture Mapping and Semantic Analysis using Oblique Aerial Imagery

Frommholz, Dirk and Linkiewicz, Magda and Poznanska, Anna-Maria (2016) Inlining 3D Reconstruction, Multi-Source Texture Mapping and Semantic Analysis using Oblique Aerial Imagery. In: XXIII ISPRS Congress, Technical Commission III, XLI (B3), pp. 605-612. Copernicus Publications. XXIII ISPRS Congress, 12.-19. Juli 2016, Prag, Tschechische Republik. DOI: doi:10.5194/isprsarchives-XLI-B3-605-2016

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Official URL: http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLI-B3/605/2016/

Abstract

This paper proposes an in-line method for the simplified reconstruction of city buildings from nadir and oblique aerial images that at the same time are being used for multi-source texture mapping with minimal resampling. Further, the resulting unrectified texture atlases are analyzed for fac¸ade elements like windows to be reintegrated into the original 3D models. Tests on real-world data of Heligoland/ Germany comprising more than 800 buildings exposed a median positional deviation of 0.31 m at the fac¸ades compared to the cadastral map, a correctness of 67% for the detected windows and good visual quality when being rendered with GPU-based perspective correction. As part of the process building reconstruction takes the oriented input images and transforms them into dense point clouds by semi-global matching (SGM). The point sets undergo local RANSAC-based regression and topology analysis to detect adjacent planar surfaces and determine their semantics. Based on this information the roof, wall and ground surfaces found get intersected and limited in their extension to form a closed 3D building hull. For texture mapping the hull polygons are projected into each possible input bitmap to find suitable color sources regarding the coverage and resolution. Occlusions are detected by ray-casting a full-scale digital surface model (DSM) of the scene and stored in pixel-precise visibility maps. These maps are used to derive overlap statistics and radiometric adjustment coefficients to be applied when the visible image parts for each building polygon are being copied into a compact texture atlas without resampling whenever possible. The atlas bitmap is passed to a commercial object-based image analysis (OBIA) tool running a custom rule set to identify windows on the contained fac¸ade patches. Following multi-resolution segmentation and classification based on brightness and contrast differences potential window objects are evaluated against geometric constraints and conditionally grown, fused and filtered morphologically. The output polygons are vectorized and reintegrated into the previously reconstructed buildings by sparsely ray-tracing their vertices. Finally the enhanced 3D models get stored as textured geometry for visualization and semantically annotated ”LOD-2.5” CityGML objects for GIS applications.

Item URL in elib:https://elib.dlr.de/105119/
Document Type:Conference or Workshop Item (Poster)
Title:Inlining 3D Reconstruction, Multi-Source Texture Mapping and Semantic Analysis using Oblique Aerial Imagery
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Frommholz, Dirkdirk.frommholz (at) dlr.deUNSPECIFIED
Linkiewicz, MagdaMagdalena.Linkiewicz (at) dlr.deUNSPECIFIED
Poznanska, Anna-MariaAnna-Maria.Poznanska (at) dlr.dehttps://orcid.org/0000-0002-9928-567X
Date:5 July 2016
Journal or Publication Title:XXIII ISPRS Congress, Technical Commission III
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:XLI
DOI :doi:10.5194/isprsarchives-XLI-B3-605-2016
Page Range:pp. 605-612
Editors:
EditorsEmail
Halounova, L.UNSPECIFIED
Schindler, K.UNSPECIFIED
Limpouch, A.UNSPECIFIED
Pajdla, T.UNSPECIFIED
Šafář, V.UNSPECIFIED
Mayer, H.UNSPECIFIED
Oude Elberink, S.UNSPECIFIED
Mallet, C.UNSPECIFIED
Rottensteiner, F.UNSPECIFIED
Brédif, M.UNSPECIFIED
Skaloud, J.UNSPECIFIED
Stilla, U.UNSPECIFIED
Publisher:Copernicus Publications
Series Name:The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Status:Published
Keywords:Aerial, Oblique, Reconstruction, Texture Mapping, Classification, Rendering, CityGML
Event Title:XXIII ISPRS Congress
Event Location:Prag, Tschechische Republik
Event Type:international Conference
Event Dates:12.-19. Juli 2016
Organizer:ISPRS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Optische Technologien und Anwendungen
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Sensor Concepts and Applications
Deposited By: Frommholz, Dirk
Deposited On:08 Jul 2016 09:49
Last Modified:31 Jul 2019 20:02

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