Volume Graphics Gmbh

Other

Physikalisch-technische Bundesanstalt

Thomas Günther

Christoph Poliwoda

Christof Reinhart

Matthias Flessner

Markus Bartscher

Sören Schüller

Sven Gondrom-Linke

Daniela Handl

Johannes Fieres

Gerd Schwaderer

Soren Schüller

Torsten Schönfeld

Matthias FLEßNER

The invention relates to a computer-implemented method for determining at least one geometric parameter required for an evaluation of measurement data, wherein the measurement data are determined by means of a radiographic measurement of a component having a component geometry, wherein a digital component representation is generated by the measurement data, wherein the method comprises the following steps: determining the measurement data by means of a radiographic measurement of a component; identifying regions one of in the digital component representation or in the component geometry as reference regions; determining at least one geometric parameter required for an evaluation of the determined measurement data, by means of the reference regions. Less computing power than in the prior art is required with the method. Furthermore, the method is able to be employed without great complexity.

Computer-implemented method for determining at least one geometric parameter required for evaluating measurement data

Described is a computer-implemented method for monitoring the status of a device for investigating objects, wherein the investigation of an object involves determining measurement data by measuring the object and operating data of the device is determined during the investigation of the object. The method includes: determining measurement data of the object by means of the device; determining operating data of the device during the determining measurement data of the object; determining at least one quality parameter from the measurement data; analysing the operating data and the at least one quality parameter; and determining a status characteristic value based on the analysing in order to monitor the status of the device, wherein the status characteristic value indicates a status of the device. The computer-implemented method comparatively easily monitors the functionality of devices for investigating objects during adaptive measurements.

Computer-implemented method for monitoring the status of a device for investigating objects

Described is determining defects of an object produced using an additive manufacturing process, including: determining spatially resolved first data relating to n objects, the first data defines a process coordinate system for each of the n objects, determining measurement data relating to the n objects by imaging the n objects, the measurement data defines, for each of the n objects, an object representation in a measurement coordinate system, determining which coordinates of at least one section of the measurement coordinate system are defect coordinates assigned to a defect in the object representation; correlating the at least one section with a corresponding section of the process coordinate system in order to collect training data, training an adaptive algorithm for determining defect coordinates in spatially resolved data, by means of the training data, determining spatially resolved second data, and analysing the second data for defects by means of the adaptive algorithm.

Computer-implemented method for determining defects of an object produced using an additive manufacturing process

Described is a method for compressing measurement data of a volume which comprises an object, wherein a digital representation of the object comprising a plurality of image information items of the object is generated by the measurement. The method comprises: providing an analysis specification for at least one predetermined region in the measurement volume; determining the measurement data in the measurement volume; defining a subset of the measurement data which corresponds to the at least one predetermined region of the analysis specification; selecting at least one compression rate for the subset on the basis of the analysis specification; selecting a first compression method for a remainder of the measurement data outside the subset, the first compression method having a compression rate; compressing the subset with the selected at least one compression rate, and compressing the remainder of the measurement data by way of the first compression method.

Computer-implemented method for compressing measurement data from a measurement of a measurement volume

The invention relates to a computer-implemented method for the measurement of an object, wherein the method comprises the following steps: ascertainment of measurement data using a radiographic measurement of the object, wherein the measurement data generates a digital representation of the object with a large number of items of image information of the object; and carrying out the following steps at least before ending the ascertainment of measurement data: analysis of at least one portion of the digital representation of the object; optimization of at least one recording parameter of the radiographic measurement using the analysed portion of the digital representation of the object; and adaptation of the step of ascertainment of measurement data taking the at least one recording parameter into consideration. The invention thus provides a computer-implemented method that has an increased efficiency.

Computer-implemented method for measuring an object

The invention relates to a method for determining errors in at least one parameter of the object derived from a digital representation of an object, wherein the digital representation comprises a large number of pixels arranged on a grid. At least one item of image information that quantifies a material-specific value of the object at the position of the pixel is assigned to a pixel. The image information results from a metrological mapping of the object, and is overlaid with statistical noise. As a result of the metrological mapping of the object, the image information of a first pixel is correlated to the image information of pixels within a surroundings of the first pixel defined by a correlation length of the image.

Method for determining errors in parameters derived from digital object representations

Described is a computer-implemented method for determining uncertainties in measurement data from a measurement of an object, wherein a digital representation of the object is generated by the measurement. The object representation has items of image information, which each indicate a value of a measurement variable for the object at a defined position of the object. Statistical noise is superimposed on the image information. The method includes determining the object representation, determining a distance field from the image information relating to the object representation, determining a strength of the statistical noise in the image information, determining an uncertainty of the distance values of the distance field on the basis of the strength of the statistical noise, and determining an uncertainty of the position of at least one point on at least one material boundary surface from the uncertainty of the distance values of the distance field.

Method for determining uncertainties in measurement data of an object using superimposed statistical noise

Described is a computer-implemented method for determining material interfaces of an object from at least one measurement of the object, a rasterized representation of the object being produced by means of the measurement, the rasterized representation having a plurality of measurement points, a measurement point having at least one piece of image information, which indicates a value of a measurement variable for the object at the position of the measurement point. The method comprises the determining of a parameterization of the rasterized representation of the object, the parameterization assigning at least one parameter to each of the measurement points of a subset of the measurement points of the representation, and the applying of at least one parameter-dependent edge-detection operator to the measurement points of the rasterized representation, an edge-detection operator being designed to determine the location of at least one material interface in the rasterized representation.

Method and device for detecting corners

Described is compressing a digital representation of an object, wherein the object representation comprises image information items for the object that each specify a value of a measurand for the object at a defined position of the object. Compressing includes determining the object representation, determining a distance field from the image information items of the object representation that comprises a plurality of data points in a grid, the distance field assigns at least one distance value to each of the data points that in each case indicate the shortest distance of the data point from a closest material boundary of the object, determining a near region around a material boundary of the object, determining a sub-set of data points of the distance field which lie outside the near region, deleting the sub-set of data points, and saving the distance field in the form of a compressed object representation.

Computer-implemented method for compressing a digital representation of an object

Described is a computer-implemented method for determining material interfaces of an object by means of at least one measurement of the object, a rasterized representation of the object having a plurality of pixels being produced by means of the measurement, each pixel having at least one piece of image information, which indicates a value of a measurement variable for the object at the position of the measurement point. The method comprises the determining of a parameterization of the rasterized representation of the object, the parameterization assigning at least one parameter to each of the measurement points of a subset of the measurement points of the representation, and the applying of at least one parameter-dependent edge-detection operator to the measurement points of the rasterized representation, an edge-detection operator being designed to determine the location of at least one material interface in the rasterized representation.

Method and device for multiple edge detection

Described is determining a local deviation of a geometry of an object from a target geometry of the object on the basis of a digital representation of the object that comprises image information items that each specify a value of a measurand for the object at a defined position of the object. This includes determining the object representation, determining a distance field from the image information items of the object representation that comprises distance values for a specific point of the distance field that specifies the shortest distance of the point from a closest material boundary of the geometry of the object, determining the target geometry of the object, and determining the local deviation of the geometry of the object from the target geometry of the object at a test point on a material boundary predefined by the target geometry.

Computer-implemented method for determining a local deviation of a geometry of an object from a target geometry of the object

Computer-implemented methods for monitoring the functional state of a system for the computer-tomographic examination of workpieces by carrying out one or more computer-tomographic measurements on the workpiece. The measurements each result here in at least one measured value for at least one measurement variable. The method for monitoring the functional state selects measured values for at least one measurement variable from at least two measurements on one or more workpieces. At least one degree of variation for the selected measured values of the at least one measurement variable as well as at least one reference degree of variation for measured values of the at least one measurement variable is determined. The functional state of the system is determined by comparing the at least one determined degree of variation with the at least one reference degree of variation for the at least one measurement variable.

Method for monitoring the functional state of a system for computer-tomographic examination of workpieces

Computer-implemented methods and computer-readable media for compressing a digital representation of an object. The object representation comprises a plurality of pixels arranged at least a first distance apart from each other in a two-dimensional plane or in a three-dimensional space. Each pixel is assigned at least one item of image information determined by a metrological representation of the object. The image information of a first pixel is correlated with the image information of pixels within an environment of the first pixel defined by a correlation length. The method comprises determining the object representation, determining the correlation length, determining a second distance less than or equal to the correlation length and greater than the first distance, and adjusting the object representation so that the pixels are arranged apart from each other by at least the second distance and by no greater than the correlation length.

Method for compressing measurement data

The invention relates to a method and a device for processing a volumetric image record. The method comprises the following steps: carrying out a non-optical image scanning method on an object to be analysed and generating a volumetric image record and extracting the object contour from the volumetric image record in order to determine the position of the object surface; defining an object surface point and a surrounding area for said object surface point and analysing the grey tones within the surrounding area; calculating a quality value, which reflects the localised quality of the surface, for the object surface point on the basis of the grey-tone analysis. The device comprises equipment for carrying out the method.

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Heidelberg, Germany

Thomas Günther