Wolfgang Rauh

• Doctor of Engineering
• VITA Zahnfabrik H. Rauter GmbH&Co. KG

The invention relates to a coordinate measuring apparatus (110) for measuring an object (3), comprising an x-ray sensory mechanism as a first sensory mechanism that is provided with an x-ray source (10) and at least one x-ray sensor (7) which detects the x-rays, and a second sensory mechanism such as a tactile and/or an optical sensory mechanism (8...

The invention relates to a method for the measurement of workpiece geometries with a coordinate measuring device (10) and to the device itself. According to the invention, measuring tasks may be optimally carried out without a requirement for devices of differing types, whereby one or more sensors (30), which are of optimal application for the rele...

A method and an apparatus for dimensionally measuring parts by means of a coordinate measuring instrument. In order enable measurement of parts that are made of different materials with great accuracy, a computerized tomography sensor is integrated into the coordinate measuring instrument.

Segmentation and object recognition in point cloud are of topical interest for computer and machine vision. In this paper, we present a very robust and computationally efficient interactive procedure between segmentation, outlier detection, and model fitting in 3D-point cloud. For an accurate and reliable estimation of the model parameters, we appl...

For pattern recognition and computer vision, fitting of curves and surfaces to a set of given data points in space is a relevant subject. In this paper, we review the current orthogonal distance fitting algorithms for parametric model features, and, present two new algorithms in a well organized and easily understandable manner. Each of these algor...

Dimensional model fitting finds its applications in various fields of science and engineering and is a relevant subject in computer/machine vision and coordinate metrology. In this paper, we present two new fitting algorithms, distance-based and coordinate-based algorithm, for implicit surfaces and plane curves, which minimize the square sum of the...

The least-squares fitting minimizes the squares sum of error-of-fit in predefined measures. By the geometric fitting, the error distances are defined with the orthogonal, or shortest, distances from the given points to the geometric feature to be fitted. For the geometric fitting of circle/sphere/ellipse/hyperbola/parabola, simple and robust nonpar...

Curve and surface fitting is a relevant subject in computer vision and coordinate metrology. In this paper, we present a new fitting algorithm for implicit surfaces and plane curves which minimizes the square sum of the orthogonal error distances between the model feature and the given data points. By the new algorithm, the model feature parameters...

One of the primary, but tedious, tasks for the user and developer of an optical 3D-measurement system is to find the homologous image points in multiple images, a task that is frequently referred to as the correspondence problem. Along with the solution, error-free correspondence and accurate measurement of image points are of great importance , on...

Fitting of parametric curves and surfaces to a set of given data points is a relevant subject in various fields of science and engineering. In this paper, we review the current orthogonal distance fitting algorithms for parametric models in a well organized and easily understandable manner, and present a new algorithm. Each of these algorithms esti...

Dimensional model fitting to a set of given points is a relevant subject in various disciplines of science and engineering. In this paper, we present a universal, and very efficient, best-fit algorithm for implicit surfaces and plane curves, by which the square sum of the orthogonal error distances of the given points to the model feature will be r...

The least squares fitting of geometric features to given points minimizes the squares sum of error-of-fit in predefined measures. By the geometric fitting, the error distances are defined with the orthogonal, or shortest, distances from the given points to the geometric feature to be fitted. For the geometric fitting of circle and ellipse, robust a...

One of the primary but tedious tasks for the user and developer of an optical 3D-measurement system is to find the homologous image points in multiple images-a task that is frequently referred to as the correspondence problem. With the solution, the error-free correspondence and accurate measurement of image points are of great importance, on which...

The least squares fitting minimizes the squares sum of error-of-fit in predefined measures. By the geometric fitting, the error distances are defined with the shortest distances from the given points to the geometric feature to be fitted. For the geometric fitting of ellipse, a robust algorithm is proposed. This is based on the coordinate descripti...

The least squares fitting of geometric features to given points minimizes the squares sum of error-of-fit in predefined measures. By the geometric fitting, the error distances are defined with the orthogonal, or shortest, distances from the given points to the geometric feature to be fitted. For the geometric fitting of circle and ellipse, robust a...

One of the primary but tedious tasks for the user and developer of an optical 3D- measurement system is to find the homologous image points in multiple images - a task that is frequently referred to as the correspondence problem. With the solution, the error-free correspondence and accurate measurement of image points are of great importance, on wh...

In den folgenden Unterabschnitten erfolgt eine Beschreibung der für den Betrieb eines Koordinatenmeßgerätes benötigten Programme. Es werden die Programme zur Steue rung und Bedienung des Gesamtsystems im Überblick behandelt, ehe im nächsten Kapitel dann die zur Bildauswertung benötigten Programme detailliert behandelt werden.

Der zunehmende Trend zur rechnerintegrierten Fertigung (CIM) macht die Integration moderner Koordinatenmeßgeräte in den aufgebauten Informations-und Datenfluß mög lich und zugleich notwendig. Diese Integration sorgt neben möglichen Rationalisierungseffekten bei verschiedenen Arbeitsschritten auch für einen lückenlosen, automatisierten Qualitätsdate...

In den folgenden Abschnitten werden Geräterealisierungen erläutert, die auf dem vorab beschriebenen Software-Konzept unter Verwendung völlig unterschiedlicher Gerätetech niken aufbauen. Die Unterschiedlichkeit der realisierten Geräte hinsichtlich mechanischer und elektro-optischer Komponenten sowie die Verschiedenartigkeit der beschriebenen Anwendu...

Die zur Bildauswertung benötigten Programme sind grundsätzlich zu trennen in geräteab hängige Module, die zum Betrieb des Auswertesystems, also zur Datenaufnahme, Digitalisierung und Speicherung etc. benötigt werden, und solche, die geräteunabhängig die eigentliche Auswertung anhand der gespeicherten Informationen vornehmen. Im folgenden werden aus...

In diesem Kapitel werden die wesentlichen Gerätekomponenten konturantastender Koordinatenmeßsysteme beschrieben. Neben ihrem Aufbau und den Gestaltungsmöglichkei ten werden auch die an die Komponenten zu stellenden Anforderungen sowie ihr Einfluß auf das Gesamtsystem, vor allem in Hinblick auf die erzielbare Meßunsicherheit, erläutert.

Für die Durchführung mehrdimensionaler Messungen an Werkstücken bieten sich eine Reihe optischer Prinzipien an, mit Hilfe derer verschiedene Aufgabenstellungen lösbar sind und die zu unterschiedlichen Meßsystemen führen. Allgemein erfolgt bei den ent sprechenden Meßsystemen die Messung am Werkstück durch Erzeugen eines optischen Bildes, Umwandlung...

Image processing systems have found wide application in industry. For most computer integrated manufacturing faci- lities it is necessary to adapt these systems thus that they can automate the interaction with and the integration of CAD and CAM Systems. In this paper new approaches will be described that make use of the coupling of CAD and image pr...

A new concept-will be presented that makes use of a standard coordinate measurement system. An image processing unit is integrated to reach for high precision measurement. The mechanical displacement system gives rise to the big measurement range while the image processing system enables the measurement of complex workpieces with high precision. Tw...