Fruition Of Cultural Heritage Research Articles

NEW INSTRUMENTS FOR SURVEY: ON LINE SOFTWARES FOR 3D RECONTRUCTION FROM IMAGES

Abstract. 3d scanning technologies had a significant development and have been widely used in documentation of cultural, architectural and archeological heritages. Modern methods of three-dimensional acquiring and modeling allow to represent an object through a digital model that combines visual potentialities of images (normally used for documentation) to the accuracy of the survey, becoming at the same time support for the visualization that for metric evaluation of any artefact that have an historical or artistic interest, opening up new possibilities for cultural heritage's fruition, cataloging and study. Despite this development, because of the small catchment area and the 3D laser scanner's sophisticated technologies, the cost of these instruments is very high and beyond the reach of most operators in the field of cultural heritages. This is the reason why they have appeared low-cost technologies or even free, allowing anyone to approach the issues of acquisition and 3D modeling, providing tools that allow to create three-dimensional models in a simple and economical way. The research, conducted by the Laboratory of Photogrammetry of the University IUAV of Venice, of which we present here some results, is intended to figure out whether, with Arc3D, it is possible to obtain results that can be somehow comparable, in therms of overall quality, to those of the laser scanner, and/or whether it is possible to integrate them. They were carried out a series of tests on certain types of objects, models made with Arc3D, from raster images, were compared with those obtained using the point clouds from laser scanner. We have also analyzed the conditions for an optimal use of Arc3D: environmental conditions (lighting), acquisition tools (digital cameras) and type and size of objects. After performing the tests described above, we analyzed the patterns generated by Arc3D to check what other graphic representations can be obtained from them: orthophotos and drawings. The research's result is a critical analysis of the software's potentialities, with an indication of the areas in which it is possible an effective and alternative use to other methods of survey.

Augmented Reality Applied to the Diagnostics and Fruition of Cultural Heritage

The term “Augmented Reality” (AR) is used to define integrated hardware and software technologies, designed to mix video footage taken by a camera with three-dimensional virtual objects. The result is a mix between real reality and virtual reality. Many applications of this technology are being developed for use in the field of cultural heritage and are being introduced for use in specialized contexts such as in certain phases of the diagnostic process or fruition. The basic algorithmic approach for augmented reality, starts from a video stream analysis that incorporates a real scene. Within the same scene are scattered a set of known geometric images called “markers”. When the software module in charge of the video flow analysis identifies a marker within the scene, it tries to position it in relation to a reference system integral with the chamber which performs the video shoot, and then replaces it in real time, overlapping with a 3D model achieved through a virtual modeling software. The aim of this article is to evaluate the state of the art augmented reality and then examine several experiments involving its application to cultural heritage.