Inspection de pièces aéronautiques pour la détection de défauts de forme à partir d'un système multi-caméras

National audienceno abstrac

Multiple-Camera Instrumentation of a Single Point Incremental Forming Process Pilot for Shape and 3D Displacement Measurements: Methodology and Results

International audienceA multiple-camera system (more than two cameras) has been developed to measurethe shape variations and the 3D displacement field of a sheet metal part during aSingle Point Incremental Forming (SPIF) operation. The modeling of the multiplecamerasystem and the calibration procedure to determine its parameters are described.The sequence of images taken during the forming operation is processedusing a multiple-view Digital Image Correlation (DIC) method and the 3D reconstructionof the part shape is obtained using a Sparse Bundle Adjustment (SBA)method. Two experiments that demonstrate the potentiality of the method are described

Shape Measurement Using a New Multi-step Stereo-DIC Algorithm That Preserves Sharp Edges

International audienceDigital Image Correlation is widely used for shape, motion and deformation measurements. Basically, the main steps of 3D-DIC for shape measurement applications are: off-line camera calibration, image matching and triangulation. The matching of each pixel of an image to a pixel in another image uses a so-called subset (correlation window). Subset size selection is a tricky issue and is a trade-off between a good spatial resolution, achieved with small subsets that preserve image details, and a low displacement uncertainty achieved with large subsets that can smooth image details.In this paper, we present a new multi-step DIC algorithm specially designed for measuring the 3D shape of objects with sharp edges. With this new algorithm an accurate 3D reconstruction of the whole object, including sharp edges that are preserved, can be achieved

Multi-camera computer vision for large volume inspection: (a) aeronautical parts inspection and (b) incremental forming

International audienceno abstrac

Détection et caractérisation de défauts par analyse des nuages de points 3D fournis par un scanner

National audienceNous avons développé un logiciel qui permet de détecter et caractériser des défauts par analyse des nuages de points 3D fournis par un scanner. Ce logiciel a été développé dans le cadre du contrôle de l'état de surface d'un fuselage avion. Il pourrait être utilisé pour d'autres applications comme par exemple la détection de défauts à la surface d'une carrosserie automobile

Towards global consensus on core outcomes for hidradenitis suppurativa research: an update from the HISTORIC consensus meetings I and II

BACKGROUND: A core outcomes set (COS) is an agreed minimum set of outcomes that should be measured and reported in all clinical trials for a specific condition. Hidradenitis suppurativa (HS) has no agreed-upon COS. A central aspect in the COS development process is to identify a set of candidate outcome domains from a long list of items. Our long list had been developed from patient interviews, a systematic review of the literature and a healthcare professional survey, and initial votes had been cast in two e-Delphi surveys. In this manuscript, we describe two in-person consensus meetings of Delphi participants designed to ensure an inclusive approach to generation of domains from related items. OBJECTIVES: To consider which items from a long list of candidate items to exclude and which to cluster into outcome domains. METHODS: The study used an international and multistakeholder approach, involving patients, dermatologists, surgeons, the pharmaceutical industry and medical regulators. The study format was a combination of formal presentations, small group work based on nominal group theory and a subsequent online confirmation survey. RESULTS: Forty-one individuals from 13 countries and four continents participated. Nine items were excluded and there was consensus to propose seven domains: disease course, physical signs, HS-specific quality of life, satisfaction, symptoms, pain and global assessments. CONCLUSIONS: The HISTORIC consensus meetings I and II will be followed by further e-Delphi rounds to finalize the core domain set, building on the work of the in-person consensus meetings