engleski

The impact of omitted control points at the geometrical accuracy of 3D-model reconstructed by SfM-algorithm

T he recent archaeometric technologies in obtaining the reliable and detailed 3Dgeometry from the surface of an archeological artefact or site mostly rely on the use of photogrammetric technologies implementing the Structure from Motion - algorithm. Although it is possible and even desirable to include a reliable calibration field (that consists of a set of well-situated and spatial determined control points) in the process of photogrammetric imaging, very often from practical reasons, it is omitted. However, the scale of the 3D-model, reconstructed by photogrammetry can be determined by use of camera data stored together with every image. In this paper, the geometrical accuracy of 3D-model, achieved by use of SfM algorithm and without use any of control points, is compared to geometrical accuracy of 3D-model, achieved by precise 3D-laser-scanning of the archaeological artefact. All investigations were done by scanning and photographing of the ancient Roman statue (torso of a Roman Emperor, Vis, marble), kept and exposed in the Lapidarium of Archaeological Museum in Zagreb. The impact of the use of control points on the accuracy of 3Dreconstruction is evaluated and presented. Finally, the necessity of use of control points is discussed.

3D-model ; photogrammetry ; laser scannin

nije evidentirano