Terrestrial laser scanner measurements suffer from systematic errors due to internal misalignments. The magnitude of the resulting errors in the point cloud in many cases exceeds the magnitude of random errors. Hence, the task of calibrating a laser scanner is important for applications with high accuracy demands. This paper primarily addresses the case of panoramic terrestrial laser scanners. ...

In this paper some experiences about the integration of panoramic imaging and terrestrial laser scanning surveys are presented. The main goal is to produce documentation with metric information for the cultural heritage panoramic navigation; furthermore, a subordinate result is to use cheap and user-friendly 3-dimensional images for a wide range of applications like the custom navigation. Three...

Terrestrial laser scanners, such as the Cyrax 2500 and its predecessor the 2400, use pulsed laser ranging and rotating mirrors to accurately measure dense sets of three-dimensional co-ordinates of entire surfaces. Range is observed by measuring the two-way time of flight (TOF) of the reflected laser pulse. The reflectorless nature of the rangefinder raises the possibility of range errors due to...

Laser scanner is noncontact instrument to measurement of spatial data. It measures object surfaces as point series and visualize as point cloud. One of the important steps on processes of laser scanning data is the registration of point clouds relation to common coordinate system. Many interactive and automatic methods have been developed for point cloud registration so far. The automatic metho...

The aim of this study is to compare two different methods of frontal bone surface model acquisition. Three dimensional models acquired by laser scanning were compared with models of the same bones acquired by virtual replicas reconstructed from a sequence of computed tomography (CT) images. The influence of volumetric CT data processing (namely thresholding), which immediately preceded the gene...

In the meantime the acquisition of dense point clouds or triangulated surface data with 3D laser range scanners is in the meantime a widely discussed topic. Especially in the areas of world modelling or autonomous navigation reliable 3D data is necessary. Mobile systems applications like collision avoidance or simultaneous localisation and mapping (SLAM) require high data rates, dense point clo...

A combined analysis of multiple terrestrial laser scanner point clouds recorded from different positions requires a geometric registration of these scans. In most applications of terrestrial laser scanning, artificial tie points, which can be recognized automatically by proprietary scanner software, are placed in the scanning area. In this case, the scan positions have to be chosen in a way tha...

PURPOSE The aim of this study is to evaluate the appropriate impression technique by analyzing the superimposition of 3D digital model for evaluating accuracy of conventional impression technique and digital impression. MATERIALS AND METHODS Twenty-four patients who had no periodontitis or temporomandibular joint disease were selected for analysis. As a reference model, digital impressions wi...