DH2015 - Track 1

Permanent URI for this collection

https://diglib.eg.org/handle/10.2312/14458

Browse

Browsing DH2015 - Track 1 by Subject "3D modeling"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    3D Reconstruction with Fisheye Images: Strategies to Survey Complex Heritage Buildings
    (IEEE, 2015) Covas, João; Ferreira, Victor; Mateus, Luís; Gabriele Guidi and Roberto Scopigno and Fabio Remondino
    Over the last few decades photogrammetry and laser scanning have been frequently considered valuable tools for creating three-dimensional models from which metric and radiometric information can be derived for the survey of cultural heritage buildings, reverse engineering, space exploration and other areas. However reconstructing old heritage buildings digitally may be a challenging task especially when the shape, geometry and volume of these buildings are intrinsically complex therefore requiring specific methods or ad-hoc solutions. Medieval castles are typical constructions that exhibit these kinds of features with inaccessible locations, bridges, wide areas followed by small and limited spaces, battlements, towers and walls occluded by vegetation. This variety of problems can prolong the time required to complete the tasks when using laser scanning or photogrammetry with conventional lenses. In this paper we present a research of use of fisheye lenses in photogrammetry, for capturing medieval castles' geometric and radiometric information of hard to reach places. We conclude that this reduces the total time needed to capture the same amount of information gathered with other instruments, it allows replacing the usage of Unmanned Aerial Vehicles (UAV) in low flight situations, makes the survey connection between areas of a building easier, reduces the total number of images and allows making a general fast survey. The castles illustrated in this paper are the Castle of Sesimbra and the Castle of The Convent of Christ, both in Portugal.
  • Thumbnail Image
    Item
    Fusion of 3D Data from Different Image-based and Range-based Sources for Efficient Heritage Recording
    (IEEE, 2015) Muñumer, Estibaliz; Lerma, José Luis; Gabriele Guidi and Roberto Scopigno and Fabio Remondino
    The rapid proliferation of three-dimensional (3D) data acquisition techniques based either on image-based approaches or on range-based approaches is changing the way cultural heritage is recorded. Independently of the technique selected, low-cost structure-from-motion (SfM) photogrammetric computer vision, stereo-plotting, surveying either with measuring tape, total station or global navigation satellite system (GNSS), up to laser scanning/LiDAR/RADAR, among others, there is a need to fuse efficiently different datasets. This research aims to test the fusion performance of the new 3DVEM - Register GEO software for the recording of a complex sculpture. The fusion of data will consider several point clouds acquired with a terrestrial laser scanner and one high-resolution point cloud generated with SfM software. The registration process is performed to merge all the data in a final homogeneous framework (reference system). The results obtained will be used to create a high-resolution 3D model of the sculpture from the consolidated data.