Infrared system for 3D scanning of metallic surfaces

Aubreton, Olivier; Bajard, Alban; Verney, Benjamin; Truchetet, Frédéric

doi:10.1007/s00138-013-0487-z

Cited by 30 publications

(11 citation statements)

References 26 publications

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“…Using algorithms, similarity calculation defines POI coincident on different images [ 2 ]. These POI can be found by detection of transition areas, such as strong curvatures, physical limits, or differences of grey intensity (“Shape from Silhouette”) [ 15 ]. A transformation matrix is then calculated to evaluate similarity between all images such as rotation or homothety.…”

Section: Ios Technologiesmentioning

confidence: 99%

“…During intraoral scanning, a major difficulty is to control patient mobility that can lead to scanning by mistake peripheral soft tissues such as the tongue or jaws [ 12 ]. Similarly, the presence of blood, saliva, or gingival fluid can also falsify the picture acquired [ 15 ]. For example, a tight film of water can lead to an error to the order of millimeters on margin impression ( Figure 5(h) ).…”

Section: Clinical Impact Of Ios Technologiesmentioning

confidence: 99%

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Intraoral Scanner Technologies: A Review to Make a Successful Impression

Richert

Goujat

Venet

et al. 2017

Journal of Healthcare Engineering

275

261

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To overcome difficulties associated with conventional techniques, impressions with IOS (intraoral scanner) and CAD/CAM (computer-aided design and manufacturing) technologies were developed for dental practice. The last decade has seen an increasing number of optical IOS devices, and these are based on different technologies; the choice of which may impact on clinical use. To allow informed choice before purchasing or renewing an IOS, this article summarizes first the technologies currently used (light projection, distance object determination, and reconstruction). In the second section, the clinical considerations of each strategy such as handling, learning curve, powdering, scanning paths, tracking, and mesh quality are discussed. The last section is dedicated to the accuracy of files and of the intermaxillary relationship registered with IOS as the rendering of files in the graphical user interface is often misleading. This overview leads to the conclusion that the current IOS is adapted for a common practice, although differences exist between the technologies employed. An important aspect highlighted in this review is the reduction in the volume of hardware which has led to an increase in the importance of software-based technologies.

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Section: Ios Technologiesmentioning

confidence: 99%

Section: Clinical Impact Of Ios Technologiesmentioning

confidence: 99%

Intraoral Scanner Technologies: A Review to Make a Successful Impression

Richert

Goujat

Venet

et al. 2017

Journal of Healthcare Engineering

275

261

View full text Add to dashboard Cite

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“…al. [32] use a Middle Wave IR (MWIR) Laser and camera to deal with specular (metallic) objects. Often, cameras or illumination sources enter the scene without being part of 3D acquisition process.…”

Section: State Of the Artmentioning

confidence: 99%

A robotic structured light camera

Olaya¹,

Berry²,

Mezouar³

2014

2014 IEEE/ASME International Conference on Advanced Intelligent Mechatronics

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Structured Light 3D scanners have released a stampede of successful applications in robotics. This opens up the possibility to identify subtle deficiencies of actual sensors and propose solutions. In this paper we present the design of a novel Structured Light scanner that defies the conventional and simplistic static cameras-projector configuration. We found that by adding some degrees of freedom to the cameras it is possible to improve the capabilities of the system, for example reducing the minimum operating distance and increasing the depth estimation accuracy. This multidisciplinary project involves the fields of mechanics, electronics, control, optics and computer engineering, and aims to design a powerful tool, for academic and industrial applications.

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“…The fiber orientation is assessed through the "Scanning From Heating" (SFH) system initially used for threedimensional digitization of transparent and metallic object [13,14,15,16]. Recently, the system has been extended to detect sub-surface defect on metallic object as well as fiber orientation assessment in carbon composite material [17].…”

Section: Methodsmentioning

confidence: 99%

Wood fiber orientation assessment based on punctual laser beam excitation: A preliminary study

Belkacemi¹,

Massich²,

Lemaître³

et al. 2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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The EU imposes standards for the use of wood in structural applications. Local singularities such as knots affect the wood mechanical properties. They can be revealed by looking at the wood fiber orientation. For this reason, many methods were proposed to estimate the orientation of wood fiber using optical means, X-rays, or scattering measurement techniques. In this paper, an approach to assess the wood fiber orientation based on thermal ellipsometry is developed. The wood part is punctually heated with a Nd-YAG Laser and the thermal response is acquired by an infrared camera. The thermal response is elliptical due to the propagation of the heat through and along the wood fibers. An experiment is presented to show the capacity of such techniques to assess fiber orientation on wood specimen. In addition, an appropriate algorithm is given to extract the orientation of the ellipse.

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Infrared system for 3D scanning of metallic surfaces

Cited by 30 publications

References 26 publications

Intraoral Scanner Technologies: A Review to Make a Successful Impression

Intraoral Scanner Technologies: A Review to Make a Successful Impression

A robotic structured light camera

Wood fiber orientation assessment based on punctual laser beam excitation: A preliminary study

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