A spectrophotometric scanner has been assembled for applications concerning the conservation of paintings and of other works of art with plane surface. Its optical components, that are a lens, a spectrometer and a monochrome matrix CCD digital camera, are arranged in axial configuration. A frame of the camera allows the image acquisition of a strip of the scene collecting the reflectance spectr...

AIM This study aimed to test the accuracy and precision of measurements of three-dimensional (3D) digital models from the pre-dentition period using a noncontact 3D measurement system (3D scanner) versus the gold standard method of direct measurements using a digital caliper on plaster models. MATERIALS AND METHODS Ten pairs of plaster models were obtained from children during the predentitio...

The purpose of this in vitro study was to assess the trueness a dental implant scanned using an intraoral high-frequency ultrasound prototype and compared with conventional optical scanners. An acrylic resin cast containing at position 11 fringe projection 3D sensor for use as reference dataset. same 10 times each group. Ultrasound scanning performed probe (42 MHz, aperture diameter 4 mm focus ...

This paper presents and explores 3D techniques for analyzing historic textile fragment. The textile fragment piece examined throughout this paper originates from the English National Trust archive held in the collection at Claydon House. The aim is to utilize data collected with a combination of both 2D pattern software and state-of-the-art 3D technology to both recreate and reconstruct a compe...

Airborne laser scanner is an integrated system of GPS, INS and laser scanner. It has become an accurate, fast, and versatile measurement technique that can complement or partly replace other existing acquisition technologies and has been used in more diverse applications that concern large-scale and precise topographic Digital Elevation Models (DEMs) and Digital Surface Models (DSMs). Up to now...

The goal of this assignment is to build a 3D scanner using one or more digital cameras and a single projector. While the “desktop scanner” [2] implemented in the previous assignment is inexpensive, it has limited practical utility. The scanning process requires manual manipulation of the stick, and the time required to sweep the shadow plane across the scene limits the system to reconstructing ...