A new metrological characterization strategy for 3D multi-camera systems
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SHORT ORIGINAL PAPER
A new metrological characterization strategy for 3D multi-camera systems Michaela Servi1
· Francesco Buonamici1 · Luca Puggelli1 · Yary Volpe1
Received: 28 February 2020 / Accepted: 23 September 2020 © The Author(s) 2020
Abstract The objective of this study is to establish a new methodology for the metrological characterization of interactive multi-camera systems. In the case of 3D system highly adapted to specific needs the accuracy evaluation cannot be performed using standard state-of-the-art techniques. To this end, the metrological characterization techniques used in the literature were investigated in order to define a new methodology that can be adjusted to each device by making the appropriate modifications. The proposed strategy is adopted for the metrological characterization of a new interactive multi-camera system for the acquisition of the arm. Keywords Multi-camera system · Optical device · Device characterization · VDI/VDE normative · Accuracy assessment
1 Introduction Thanks to new low-cost technologies introduced in the optical sensor scenario, the deployment of custom 3D acquisition and processing systems, that are tailored to specific applications in their form and technology is becoming an increasingly widespread reality. This category of acquisition systems, made ad-hoc for their purpose of use, finds application in many fields, among others fashion [4], fitness [5] and medicine [2]. Unlike professional technologies (e.g. Romer Absolute Arm, Konica Minolta Range7, Aicon 3D System StereoScan etc.), in these cases, the accuracy of the acquired data is not certified. Furthermore, one aspect introduced by multi-camera systems is the manipulation of raw data in order to merge the several acquisitions into a single object. Typically, the manipulation of data consists of filtering, to eliminate unnecessary portion of points and
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Michaela Servi [email protected] Francesco Buonamici [email protected]
to eliminate noise, and the alignment in a global reference system with iterative algorithms. These steps can, however, cause an accumulation of error thus compromising the accuracy of the final result. This can hinder the extensive use of multi-camera systems based on low-cost depth sensors if no data is provided on the accuracy with which the reference geometry is replicated. In order to overcome this problem, the accuracy of the system in reproducing the object to be acquired must be quantitatively measured. To this end, the metrological characterization of this kind of multi-camera system, highly tailored to specific needs, cannot be addressed using standard state-of-the-art techniques, since the few existing standards are not easily adaptable. In this paper is presented a new strategy for the metrological characterization, and therefore the evaluation of the accuracy, of interactive multi-camera acquisition systems, and is used in the characterization of a new scanner specifically design for the hand-wrist-arm (HWA) district. The procedure, here tested on
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