Evaluation of algorithms and tools for 3D modeling of laser scanning data.

Abstract

Following report treats about 3D modeling, merging and post-processing of laser scan data (point clouds) acquired with 3D laser sensors and high-resolution digital images. Objects that were recorded have historical value and can be counted in the branch of cultural heritage application of laser scanning. Three dimensional laser scanners have developed and brought whole new idea to the capturing, preservation and study of historical and cultural heritage. The main aim was to produce 3D models of several objects by using different available tools and algorithms and evaluate and compare the results from the point of view of the efficiency in data processing, accuracy and distinctness of the models. Also availability of each tool will be taken into consideration. Additionally, the issue of merging datasets acquired by two different 3D laser sensors will be examined. Two objects were captured within the Master thesis, the inside of the part of the Nidaros Cathedral in Trondheim and the Ostre Gløshaugen building situated in main NTNU campus- Gløshaugen. Two different 3D laser systems were used. One produced by Riegl company which includes 3D sensor with software package RiSCAN PRO and high-resolution camera, Nikon D200. Second equipment was provided by FARO company and it includes FARO Focus 3D sensor with software package FARO SCENE. Report consists of the introduction to the topic together with the aim and the expected results. Further, there is a part of theory and basic principles of terrestrial laser scanning with description of applications and examples of already carried out projects. Main chapter consists of information on how the work was done and what kind of results were obtained. Problems, final results, comparison of different methods are included in the last chapter.