摘要:
Exemplary method and apparatus embodiments according to the applications can provide calibration of a dental scanning device. An exemplary dental apparatus can include a sensing apparatus including at least one lens and a sensor that is configured to obtain one or more images of at least one surface position, and a calibration target including a spatial light modulator configured to form a prescribed set of calibration patterns, and whose display plane corresponds to the at least one surface position.
摘要:
A method of calibrating a three-dimensional measurement system having a plurality of cameras and at least one projector is provided. The method includes performing a full calibration (100) for each camera (118, 120, 122, 124) /projector (128) pair where the full calibration generates at least two sets of correction matrices. Subsequently, an updated calibration (200) is performed for each camera(118, 120, 122, 124)/projector (128) pair. The updated calibration (200) changes less than all of the sets of correction matrices.
摘要:
Procédé d'étalonnage d'un système de restitution visuelle en réalité augmentée comprenant au moins un dispositif d'affichage partiellement transparent, par rapport à son utilisateur, et système associé Procédé d'étalonnage d'un système de restitution visuelle en réalité augmentée comprenant au moins un dispositif d'affichage partiellement transparent, par rapport à son utilisateur, comprenant au moins une fois la réalisation des étapes consistant à: - afficher une courbe d'étalonnage en deux dimensions (CE 2D ) sur un dispositif d'affichage (3) partiellement transparent du dispositif d'affichage partiellement transparent; - enregistrer une courbe en trois dimensions (C 3D ) décrite par l'utilisateur au moyen d'un dispositif de pointage en trois dimensions (5) de sorte que la trajectoire décrite par le dispositif de pointage en trois dimensions (5) soit alignée, selon le point de vue de l'utilisateur, avec la courbe d'étalonnage en deux dimensions (CE 2D ) affichée sur le dispositif d'affichage (5); et - mettre en correspondance la courbe en trois dimensions (C 3D ) et la courbe d'étalonnage en deux dimensions (CE2D) affichée sur le dispositif d'affichage (5); et comprenant une étape consistant à étalonner ledit système de restitution visuelle en réalité augmentée, par détermination des paramètres d'un modèle permettant de représenter l'ensemble comprenant l'œil de l'utilisateur 1 et le dispositif d'affichage (5) partiellement transparent de l'dispositif d'affichage partiellement transparent sur lequel l'œil (1) regarde, à partir de ladite mise en correspondance.
摘要:
A light projector (10) is disclosed, in particular for a measuring instrument (12) in a tool, comprising a computing unit (14) designed for processing an image data packet (16) comprising data for at least two images transmitted by another computing unit (46) to the light projector (10), and characterised in that the computing unit (14) is provided for splitting the image data packet (16) in such a way that portions of a coherent data stream of the image data packet (16) are assigned to the at least two images, such that the at least two images can be represented and/or projected, in particular separately, and that individual portions of the image data packet (16) can be retransmitted.
摘要:
A calibration apparatus for calibrating a projection unit projecting light-rays includes an imaging unit for taking an image of a surface of an object having a location and an attitude, the light-rays being projected onto the surface by the projection unit; a location-and-attitude estimation unit for estimating the location and the attitude of the surface based on the image; a reflection-point estimation unit for estimating, based on the estimated location and the attitude, a reflection point at which one of the light-rays is reflected by the surface; and an identification unit for identifying both a passing point that the one of the light-rays passes and a direction in which the one of the light-rays passes the passing point, or identifying only the direction, based on multiple reflection points that are obtained by the reflection-point estimation unit with respect to multiple different locations and/or multiple different attitudes of the surface.
摘要:
A calibration device for use in an optical, part measuring system is provided. The device has a central axis and a plurality of regions which are rotationally symmetric about the axis. The device includes a series of step-shaped portions defining a multi-step region having a plurality of step edges. A profile of the multi-step region contains information for calibrating the system. The device further includes a plurality of cylindrically-shaped portions spaced apart along the axis and defining constant diameter regions containing information for calibrating the system. The device still further includes a frustum-shaped portion defining a pair of spaced, slope edge regions and a sloped region having boundaries marked by the pair of slope edge regions. The frustum-shaped portion has first and second diameters at its boundaries which define a range of diameters of parts capable of being measured in the system.
摘要:
A method for combining shape data from multiple views in a common co-ordinate system to define the 3-D shape and/or colour of an object, the method comprising: projecting one or more optical datum(s)/markers onto the object surface; projecting light over an area of the object surface; capturing light reflected from the surface; using the optical datum(s)/markers as reference points in multiple views of the object, and using the multiple views and the reference points to determine the shape of the object.
摘要:
An aspect of the invention relates to a calibration standard for a three-dimensional measurament system and various calibration methods and techniques. The calibration standard typically includes a calibration standard and a plurality of optical targets. The optical targets being are affixed to the calibration standard surface and difine a three-dimensional distribution of optical reference points. The optical targets can be serve as active, passive calibration targets, or combinations of both. In one embodiment, the optical targets include an otpical source and a diffusing target, and each of the optical sources are configured to illuminate the respective diffusing target. The optical targets can be removably affixed to the calibration standard surface.
摘要:
A calibration system is provided for calibrating a sensor with respect to an external reference frame associated with manufacturing gauging station (200). A target calibration device (600) is positioned at a vantage point to detect and calibrate its reference frame in relation to the external reference frame. A reference target having at least three non-coplanar reflective surfaces (406) is illuminated by the structured light emanating from the sensor. In this way, the calibration system is able to determine the spatial location and orientation of the reference target in relation to the sensor. The calibration system further includes a coordinate transformation system for coordinating the measurement data from the target calibration device and from the feature sensor (240), whereby the feature sensor (240) is calibrated with respect to the external reference frame.
摘要:
A system for high accuracy calibration of a scanning system, which provides an object for calibration of a known geometry, such as a plane or a sphere. Upon that object is marked a pattern of points or geometric shapes, such as set of equilateral triangles or their vertices. A set of computer programmed elements process photographic images of the object (containing a depiction of the pattern of geometric objects) and scanned images of the object to calibrate high precision parameters, including a focal point relationship value for scanning systems which use a camera as an image collector (which describes the relationships between the focal point of the lens and the light/image collection device of the camera), a set of values to correct for distortion of the lens, the relative distance between the image collector and the scanner light source and also an initial angle to determine light position scanning. The known geometric constraints of the object allow the location of the object to be determined by photographic images. By scanning the object and computing 3D X, Y, Z coordinates for those points against a constraint that the X, Y, Z coordinates fit onto the surface of the object, the system calibrates parameters pertaining to the relative distances between the image collector and light source, an initial angle of rotation for systems which employ movable light sources and other parameters. The system is applied to multiple camera scanning systems to calibrate rotation matrices and translation vectors which facilitate the joining of the scanned data. The system further facilitates the design of flexible and movable scanning systems, such as portable scanners.