Conference proceedings of SPIE

Title: Spatiotemporal framework for human indoor activity monitoring

Authors: Ziad Salem, Andreas Peter Weiss, Franz Peter Wenzl


Recently, indoor activity monitoring of human beings has gained more and more relevance. In particular, the determination of the spatial and temporal context of a user is of utter importance in many applications like monitoring or safety. In this paper, we present a framework that can identify what, where and how long a user is performing a certain activity by the utilization of a low cost and low complex system. Our system only comprises of a single inertial measurement unit and a single RGB sensitive photodiode, with no prerequisite for infrastructural modifications. By using independent decision trees, also the training effort can be kept minimal. Additionally, we verify experimentally the optimal set of features to be used for the framework. Overall, the achieved results are above 90 % in correct determinations of the room the user is in, the activity the user is performing and in which direction the activity is undertaken.

Citation: Ziad Salem, Andreas Peter Weiss, Franz Peter Wenzl, “A spatiotemporal framework for human indoor activity monitoring,” Proc. SPIE 11525, SPIE Future Sensing Technologies, 115251L (8 November 2020); doi: 10.1117/12.2579884


CoBCom – International Conference on Broadband Communications for Next Generation Networks and Multimedia Applications

July 07th – 09th, 2020, Graz, Austria

In the, due to the Corona crisis, only virtually held 3rd CoBCom – International Conference on Broadband Communications for Next Generation Networks and Multimedia Applications 2020 Conference from 07.07.2020 to 09.07.2020, Dr. Andreas Peter Weiss gave a talk with the title “3D Visible Light Positioning of an Angle Diverse Receiver based on Track Analysis”. In this work it is shown, how the position of an angle diverse receiver can be determined by utilizing the visible light spectrum. This technology is also known as Visible Light Positioning (VLP). Especially in rooms with a symmetrical arrangement of the light sources the method of Fingerprinting suffers performance degradation from ambiguous values in the used offline map with this method. In this work it is shown how this problem can be overcome by extending the position estimation algorithm in a way that it does not only take the current received signals into consideration, but to find the position estimation on the analysis of a series of consecutive signals caused by the receivers movements. In his talk, Andreas gave a detailed description of the utilized receiver design, the implemented algorithm and the achieved results.     

2nd CISET 2019, 10 – 12 October 2019, Mersin / TURKEY

Dr. Ziad Salem, Senior Scientist at JOANNEUM RESEARCH MATERIALS/SMART CONNECTED LIGHTING, has been invited as a keynote speaker to the symposium “2nd Cilicia International Symposium on Engineering and Technology”.

Dr. Ziad Salem

Dr. Ziad held a lecture on “Visible Light Communication (VLC) and the Innovation ahead for Internet of Things (IoT)”. Transmission of data is one of the most important day-to-day activities in the fast growing world. With the increase in the number of devices, which access the Internet (IoT), the availability of fixed bandwidth makes it much more difficult to enjoy high data transfer rates and to connect a secure network. Visible light communication (VLC), or Light Fidelity (Li-Fi), is a subset of Optical Wireless Communications (OWC) technologies that uses light as medium to deliver high-speed communication in a manner similar to Wi-Fi and complies with the IEEE standard (IEEE 802.15.7). VLC  uses visible light between 400 and 800 THz (electromagnetic spectrum 780–375 nm). VLC provides better bandwidth, efficiency, connectivity, security and high speeds. VLC had already implemented in many installations related to Smart Buildings, Smart Cities, Smart Farming, Smart Street lighting, and Automotive. This technology is expected to grow rapidly. “Indoor navigation through visible light communication” provides an easy approach for example “visitors to shopping malls”, “airport terminals” etc. to find their location and navigate their way forward.

BalkanLight Junior 2019, 19 – 21 September 2019, Plovdiv / BULGARIA

From 19. – 21. September the Balkan Lights Junior 2019 conference was held in the Technical University – Sofia, Branch Plovdiv.  Participants included researchers, lighting experts and young scientists who were encouraged to share their knowledge on the conference topics. Over 40 papers were presented on this year’s topics, which include light sources, lighting design and photometric studies, lighting control systems, health effects and environmental issues as well as future directions in lighting engineering.  

Felix Lichtenegger (r.), (c) Plamen Tsankov

The work presented by Felix Lichtenegger, master student at JOANNEUM RESEARCH MATERIALS, focuses on optical simulation techniques in Visible Light Communication (VLC).  Visible Light Communication is a form of Optical Wireless Communication (OWC), which uses light in the visible spectrum of electromagnetic waves for data communication. With ray-tracing based computer simulations it is possible to simulate the illumination of indoor environments as well as the characteristics of data communication with one common simulation tool. The presented paper proposes new simulation strategies for less time-consuming calculations that were developed during his master thesis as part of the SmartLight2Live project. For further information please visit:

Proceedings of the “BalkanLight Junior 2019”

The proceedings of the “BalkanLight Junior 2019” conference have now been published. Among others, they also contain Felix Lichtenegger´s contribution on “Ray-tracing based channel modeling for the simulation of the performance of visible light communication in an indoor environment“, which can be found here:

The full citation is: F. Lichtenegger, C. Leiner, C. Sommer, A. P. Weiss, F. P. Wenzl, Ray-tracing based channel modelling for the simulation of the performance of visible light communication in an indoor environment, Proc. of the Second Balkan Junior Conference on Lighting, Balkan Light Junior, (2019) DOI: 10.1109/BLJ.2019.8883669