Abstract
<p class="Abstract"><span lang="EN-US">ABSTRACT</span></p><p class="Abstract"><span lang="EN-US">Advanced 3D survey technologies, such as Digital Photogrammetry (imaged based) and Laser Scanner, are nowadays widely used in Cultural Heritage and Archaeological fields. The present paper describes the investigations realized by the Laboratory Hesutech of the Polytechnic of Milan in cooperation with the Superintendence Archaeology Campania in order to examine the potentiality of Image Based Modeling (IBM) systems applied to the archaeological field for advanced documentation purposes. Besides the 3D model production workflow in an uncommon excavation environment, a special consideration about the reached accuracy will be discussed.</span></p><p class="Abstract"><span lang="EN-US">In the first part of the research, a comparison between photogrammetric camera parameters obtained with IBM systems and the ones provided with the calibration certificate by the manufacturer of the camera is performed. </span></p><p class="Abstract" align="left"><span lang="EN-US">In the second part of the research, the operational phases of the application of such advanced 3D survey technologies are shown. The test field is the archaeological excavation area for the construction of the new “Municipio” underground station in Naples. Due to its position in one of the historical area of the city, its construction coexists with the archaeological excavations and it is strictly tied to their evolution. In such conditions, the need to reduce as much as possible the time to build the public infrastructure is a very relevant feature together with the ability to produce accurate documentation of what is considered archaeologically important.</span></p>
Highlights
Nowadays, three-dimensional models of objects from images are a standard in a wide range of applications from autonomous robotics to industrial vision and consumer digital entertainment
It has been a topic of intensive research since the early days of computer vision and in the field of Cultural Heritage [1], but it has eluded a general solution regarding the accuracy in photogrammetric systems
In order to evaluate the overall accuracy of the Image Based Modelling (IBM) system a calibration test was realized in a closed environment set-up in a square room of about 4 meters of length, with a cross vault on the top (Figure 3)
Summary
Three-dimensional models of objects from images are a standard in a wide range of applications from autonomous robotics to industrial vision and consumer digital entertainment. It has been a topic of intensive research since the early days of computer vision and in the field of Cultural Heritage [1], but it has eluded a general solution regarding the accuracy in photogrammetric systems. Image Based Modelling (IBM) is based on multiple 2D image measurements to recover 3D object information through a mathematical model. This method calculates 3D measurements from multiple views with the use of projective geometry and a perspective camera model. It guarantees a good portability and implies often low cost sensors [2]. Between 50 mm and 500 mm; metric calibration certificate for each lens; pixel size 6.8 μm
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