Mr. Hartwig Plach Profile

Hartwig Plach

at Technische Univ Wien

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Publications (2)

Proceedings Article | 18 October 2002 Paper

Advantage of using region of interests in automated part sorting with line-scan cameras in real time

Alexander Brenner, Hartwig Plach, Thomas Berndorfer, Walter van Dyck

Proceedings Volume 4902, (2002) https://doi.org/10.1117/12.467618

KEYWORDS: Optoelectronics, Inspection, Optoelectronic devices, Binary data, Cameras, Line scan image sensors, Image classification, Light sources, Image acquisition, Feature extraction

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A general problem in automation is the correct supply of assembly parts to assembly units. At the same time it is of decisive importance that the stable orientation as well as eventual bad quality characteristics of the assembly parts can be recognized to prevent a faulty assembly, a standstill of machine, or, in the worst case, a destruction of the assembly unit. In practice, among mechanical devices, optoelectronic inspectautomates are used more and more to solve this problem of correct sorting of assembly parts. These optoelectronic devices are checking the stable orientation and corresponding desired quality characteristics of assembly parts touch-less and automated. For solving this task it is necessary to calculate some features of the assembly part that has to be checked in the first step. The second step is to use these calculated features for a safe and stable classification of an assembly part. The calculation of the necessary features as well as the classification have to be realized in real-time. The amount of time that has to be kept, typically ranges from 5ms to 200ms depending on the assembly part that has to be checked and depending on the configuration of the optoelectronic inspectautomate. For that purpose features are calculated for a realized classification with which it is possible to check the stable orientation and corresponding desired quality characteristics for a multitude of assembly parts. But it is not possible to realize a safe and stable classification with these features, where the several stable orientations and with it the corresponding desired quality characteristics can only be classified because of small details in the acquired images of the assembly part to be checked. In the cases of application where these described features cannot be used for a safe and stable classification it is necessary to introduce an additional feature with which it is possible to fulfill these applications with optoelectronic inspectautomates, because of its special characteristics. THerefore it is possible to increase the field of applications for such devices. This paper will introduce the feature Region of Interest which gives the possibility of using small details of an assembly part for a safe and stable classification of its stable orientation and quality characteristics. Additionally, this paper will describe the general implementation of the featuer Region of Interest for an optoelectronic inspectautomate.

Proceedings Article | 18 October 2002 Paper

Survey of multivariate calibration methods for pattern classification

Hartwig Plach, Christian Eitzinger, Thomas Berndorfer, Walter van Dyck

Proceedings Volume 4902, (2002) https://doi.org/10.1117/12.467254

KEYWORDS: Image classification, Calibration, Data modeling, Principal component analysis, Iris recognition, Optimization (mathematics), Systems modeling, Image processing, Cancer, Radar

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