4TH International Congress on Technology - Engineering & SCIENCE - Kuala Lumpur - Malaysia (2017-08-05)

Study On Sfm Technology In Enhancing Integrity Of Historical Architecture Digitalization
Digitalized storage of the historical architectures which are of great value in culture is crucial to the inheritance of human civilization. The light detection and ranging technology, or Lidar, is widely used in measuring the 3D space size of the historical architectures. However, due to the complicated structures and sheltered parts of the architectures, some key data for the 3D point cloud model are unable to be measured. In order to solve that problem, manual works are needed. This not only increases the errors made by inaccurate measuring, but also causes a lot of defects to the digitalized storage. Based on that, this study attempts to establish the 3D point cloud model of the key positions by using the technology of SfM. SfM, which is connected to the Lidar, is aimed at establishing the 3D point cloud model that can meet the needs of the traditional architectures. In this study, the targets are uniformly scattered in a square wall with the length of sides of 1.5 meters. Then, the errors made by measuring are compared as well as analyzed by Lidar and SfM. The result shows that quotient of the errors and the measuring distance tends to be proportional, and the maximum difference quantity is -1.75 centimeters. But if these two technologies are combined by the way of indirect operation of consummation of errors, the standard error is ±1.21 centimeters. That is to say, the concordance of Lidar and SfM will be beneficial to the integrity and application of the 3D point cloud model of the historical architectures.
Yu Wei Chang, Tsung Chiang Wu