TY - GEN A1 - Handrich, Jan A1 - Vandenhouten, Ralf T1 - Erweiterung eines landmarkenbasierten Innenraumortungsverfahrens für Mobilgeräte mit ARCore T2 - Wissenschaftliche Beiträge 2019 N2 - Die Lokalisierung in Innenräumen, die sich nicht auf Satellitennavigation wie GPS verlassen kann, ist nach wie vor eine Herausforderung. Viele Methoden zur Lokalisierung in Innenräumen beruhen auf Funksignalen oder anderen Sendern (z.B. Infrarot), die eine kostenintensive Infrastruktur erfordern, die in einem Gebäude installiert werden muss. Außerdem sind diese Techniken ungenau, wenn Reflexionen der Signale in einem Gebäude auftreten. Die Forschungsgruppe Telematik der TH Wildau hat für diese Problemstellung ein optisches Verfahren zur Innenraumlokalisierung entwickelt, das die Kamera eines mobilen Geräts verwendet. Dieser Ansatz erfordert nur die Verfügbarkeit von mehreren identifizierbaren Landmarken, die kostengünstig in einem Gebäude installiert werden können. In diesem Beitrag soll eine Möglichkeit vorgestellt werden, dieses landmarkenbasierte Verfahren mit der Augmented Reality-Bibliothek ARCore von Google zu erweitern, um eine kontinuierliche Positionsermittlung zu ermöglichen, auch wenn vorübergehend keine Landmarken durch die Gerätekamera erfasst ­werden können. N2 - Indoor localization, which cannot rely on satellite navigation such as GPS, remains a challenge. Many indoor localization methods depend on radio signals or other transmitters (e.g. infrared) that require a costly infrastructure to be installed in a building. In addition, these techniques are inaccurate when reflections of the signals occur in a building. The telematics research group at TH Wildau has developed an optical method for indoor localization for this problem that uses the camera of a mobile device. This approach only requires the availability of several identifiable landmarks that can be installed cost-effectively in a building. In this article, a way is presented to extend this landmark based method with Google's Augmented Reality library ARCore to enable continuous position tracking even if no landmarks can be captured by the device ­camera temporarily. Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-10790 SN - 0949-8214 VL - 23 SP - 27 EP - 32 ER - TY - JOUR A1 - Vandenhouten, Ralf A1 - Selz, Miriam A1 - Doktor, Michael T1 - Werkzeuge für die gezielte Parodontalbetreuung mit individueller Risikoanalyse JF - PN Parodontologie Nachrichten N2 - Mit neuer Methode lässt sich die Wahrscheinlichkeit einer fortschreitenden Parodontitis abschätzen. Y1 - 2005 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-9355 UR - https://media.zwp-online.info/archiv/pub/sim/pn/2005/pn0205/pn0205_08_selz_dexcel.pdf SN - 1613-7191 VL - 2005 IS - 2 ER - TY - GEN A1 - Gedat, Egbert A1 - Fechner, Pascal A1 - Fiebelkorn, Richard A1 - Vandenhouten, Ralf T1 - Szenenanalyse und Unterscheidung der Skelette mehrerer Menschen in digitalen Bildern mit Graphentheorie durch eine k-kürzeste-disjunkte-Wege-Suche T2 - Wissenschaftliche Beiträge 2017 N2 - Das Erkennen von Personen auf Fotos und in Videos geschieht in aktuellen Klassifizierungsverfahren durch die Zuordnung eines Köperteils zu jedem Pixel. Anschließend werden die gefundenen Körperteile zu Skeletten zusammengefasst. Im Falle mehrerer abgebildeter Personen ergibt sich das Problem der Zuordnung der Körperteile zu den verschiedenen Skeletten. Es wurde in dieser Arbeit ein auf dem Suurballe-Algorithmus basierendes graphentheoretisches Verfahren entwickelt, das diese Aufgabe löst. Aufbauend auf im Wesentlichen abstandsabhängigen Kantengewichten wird eine k-kürzeste-disjunkte-Wege-Suche durchgeführt. Unter Einbezug von möglicherweise fehlenden Körperteilen durch Unsichtbar-Knoten und automatisches Aussortieren zu viel gefundener Körperteile werden so die k-optimalen Skelette gefunden. Die Methode wurde an idealisierten computergenerierten Bildern mit einer Trefferquote von 100 % gefundener Personen getestet. Ein Test mit realen Bilddaten lieferte eine Trefferquote von 71,7 %. N2 - Recognition of humans on photos and in videos is done per current classification procedures by assigning a body part to each pixel. The body parts thus allocated are subsequently ordered into skeletons. In the case the images indicate that multiple humans are present, the problem arises of assigning the body parts to different skeletons. A Suurballe algorithm-based method developed by us solves this task. By mainly relying on distance-related edge weights, a k shortest disjoint paths search is performed. Accounting for possibly missing body parts by invisible-nodes and automatically sorting out redundant body parts, the optimal k skeletons are found. The method was tested with computer-generated data, yielding a rate of 100 % persons detected. A test with real-world images yielded a recall ratio of 71.7 %. Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-9394 SN - 0949-8214 VL - 21 SP - 31 EP - 35 ER - TY - JOUR A1 - Vandenhouten, Ralf A1 - Kistel, Thomas T1 - Aus der Entfernung: Verteilte Dienste mit R-OSGi JF - iX N2 - OSGi hat sich in vielen Anwendungsbereichen als flexibles Komponenten-Framework etabliert. Damit entwickelte Module bieten Dienste an und können von anderen Modulen genutzt werden. Mit der Middleware R-OSGi lassen sich OSGi-Komponenten auch über Systemgrenzen hinweg verteilen. Y1 - 2009 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-9507 SN - 0935-9680 VL - 2009 IS - 12 SP - 142 EP - 146 ER - TY - JOUR A1 - Holland-Moritz, Ralph A1 - Vandenhouten, Ralf T1 - Detection of Movement Profiles in Facility Management Using Complex Event Processing JF - International Journal of Information Science N2 - This paper presents a solution for detecting movement and spreading profiles by analyzing sensor data in the facility management. First of all, a scenario is defined and described. On the basis of this scenario an approach is made using integration of events over time and location. For making the integration possible the required information, which the data objects have to provide, is identified. At the end a solution is presented using Complex Event Processing to implement the integration of events. KW - facility management KW - complex event processing KW - sensor KW - detector KW - movement profile KW - spatial dimension KW - integration KW - alarm reliability KW - event driven architecture KW - evaluation KW - security KW - intrusion KW - fire Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-9495 UR - http://article.sapub.org/10.5923.j.ijis.20130301.02.html SN - 2163-193X VL - 3 IS - 1 SP - 7 EP - 12 ER - TY - JOUR A1 - Vandenhouten, Ralf A1 - Lambertz, Manfred A1 - Langhorst, Peter A1 - Grebe, Reinhard T1 - Nonstationary time-series analysis applied to investigation of brainstem system dynamics JF - IEEE Transactions on Biomedical Engineering (T-BME) N2 - Previous investigations of the dynamic organization of the lower brainstem and its relation to peripheral and other central nervous systems were predominantly performed by linear methods. These are based on time-averaging algorithms, which merely can be applied to stationary signal intervals. Thus, the current concept of the common brainstem system (CBS) in the reticular formation (RF) of the lower brainstem and basic types of its functional organization have been developed. Here, the authors present experiments where neuronal activities of the RF and the nucleus tractus solitarii (NTS, first relay station of baroreceptor afferents) were recorded together with related parameters of electroencephalogram (EEG), respiration, and cardiovascular system. The RF neurons are part of the CBS, which participates in regulation and coordination of cardiovascular, respiratory, and motor systems, and vigilance. The physiological time series, thus acquired, yield information about the internal dynamic coordination of the participating regulation processes. The major problem in evaluating these data is the nonlinearity and nonstationarity of the signals. The authors used a set of especially designed time resolving methods to evaluate nonlinear dynamic couplings in the interaction between CBS neurons and cardiovascular signals, respiration and the EEG, and between NTS neurons (influenced by baroreceptor afferents) and CBS neurons. KW - time series analysis KW - neuron KW - radio frequency KW - electroencephalography KW - cardiology KW - central nervous system KW - relay KW - cardiovascular system KW - nonlinear dynamical system KW - design methodology Y1 - 2000 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-9337 SN - 1558-2531 VL - 47 IS - 6 SP - 729 EP - 737 ER - TY - CHAP A1 - Vandenhouten, Ralf A1 - Hermerschmidt, Andreas A1 - Fiebelkorn, Richard T1 - Design and quality metrics of point patterns for coded structured light illumination with diffractive optical elements in optical 3D sensors T2 - Proceedings of SPIE N2 - Structured light has become a widespread technique for the development of camera-based 3D sensors. The structured illumination provides texture to homogeneous objects and thus allows for the reliable determination of the disparity of each object point in a stereo-camera setting. Even a monocular 3D sensor is possible if the light projector has a fixed relative position to the camera and if the structured light is coded, i.e. the position within the whole light pattern can be reconstructed uniquely from a small local window of the pattern, the uniqueness window. Coded patterns with such a uniqueness property are called Perfect SubMaps (PSM). In our paper we focus on the design and evaluation of the subset of symmetric isolated binary toroidal PSMs (SIBTPSM) for structured light patterns, because of their beneficial properties with respect to the signal-to-noise ratio and the use with laser light sources and DOEs. We define several figures of merit that are relevant for the practical use of PSMs in a 3D sensor: the PSM size, the size of the uniqueness window, the Hamming distance, the density, and the homogeneity. We have created SIBTPSMs using our own dedicated algorithms and have designed and fabricated DOEs that produce these patterns with large fan angles of 61° × 47° when used with near-infrared diode lasers (λ = 830nm). We analyze the influence of these characteristics on the 3D measurement process by theory, simulations, and experiments. The patterns of publicly available DOEs based on SIBTPSMs are used for comparison and reference. Our results show that the PSM width, the uniqueness window size, the minimum and average Hamming distances, and the uniformity have strong impact on either speed or quality of the 3D reconstruction, whereas the point density and the PSM height are of minor importance. KW - structured light KW - 3D sensor KW - diffractive optical element KW - DOE KW - perfect submap KW - PSM KW - symmetric PSM Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-9798 SN - 1996-756X VL - 10335 ER - TY - JOUR A1 - Perlitz, Volker A1 - Lambertz, Manfred A1 - Cotuk, Birol A1 - Grebe, Reinhard A1 - Vandenhouten, Ralf A1 - Flatten, Guido A1 - Petzold, Ernst Richard A1 - Schmid-Schönbein, Holger A1 - Langhorst, Peter T1 - Cardiovascular rhythms in the 0.15-Hz band: common origin of identical phenomena in man and dog in the reticular formation of the brain stem? JF - Pflügers Archiv: European Journal of Physiology N2 - Selected examples from experiments in humans and dogs with time series of reticular neurons, respiration, arterial blood pressure and cutaneous forehead blood content fluctuations were analysed using multiscaled time-frequency distribution, post-event-scan and pointwise transinformation. We found in both experiments a “0.15-Hz rhythm” exhibiting periods of spindle waves (increasing and decreasing amplitudes), phase synchronized with respiration at 1:2 and 1:1 integer number ratios. At times of wave-epochs and n:m phase synchronization, the 0.15-Hz rhythm appeared in heart rate and arterial blood pressure. As phase synchronization of the 0.15-Hz rhythm with respiration was established at a 1:1 integer number ratio, all cardiovascular-respiratory oscillations were synchronized at 0.15 Hz. Analysis of a canine experiment supplied evidence that the emergence of the 0.15-Hz rhythm and n:m phase synchronization appears to result from a decline in the level of the general activity of the organism associated with a decline in the level of activity of reticular neurons in the lower brainstem network. These findings corroborate the notion of the 0.15-Hz rhythm as a marker of the “trophotropic mode of operation” first introduced by W.R. Hess. KW - vegetative rhythm KW - cardiovascular-respiratory coordination KW - n:m phase synchronization KW - autogenic training KW - lower brainstem dynamics KW - non-linear analysis Y1 - 2004 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-9348 SN - 1432-2013 VL - 448 IS - 6 ER -