Brenner - Research Projects

Laser Scanning

  • Collaborative acquisition of predictive maps
    Self-driving cars and robots that run autonomously over long periods of time need high precision and up-to-date models of the environment. Natural environments contain dynamic objects and change over time. Since a permanent observation of “everything” is impossible and there will always be a first time visit of the changed area, a map that takes into account the possibility of change is needed.
    Team: Schachtschneider, Brenner
    Year: 2017
    Sponsors: DFG-Graduiertenkolleg i.c.sens

Robotics

  • Landmark-based localization
    Within the project, new approaches are developed for a highly accurate localization of vehicles relative to their environment. Furthermore, it is analyzed how detailed descriptions of the environment can be used for interpreting the scenery, for example for active driver assistance systems
    Team: Schlichting, Brenner
    Year: 2017
  • Semantic Segmentation of Point Clouds using Semi Supervised Transfer Learning
    Semantic segmentation in 3d describes a point wise classification of point clouds. We think this task is challenging because on one side it is hard for humans to annotate the necessary data, because objects may appear ambiguous and labelling in 3d can be time consuming. On the other hand it appears that there is still no preferred way of how the data should be processed in order to use it with deep neural networks.
    Leaders: Brenner
    Team: Peters, Brenner
    Year: 2017
    Sponsors: DFG-Graduiertenkolleg i.c.sens
  • Collaborative acquisition of predictive maps
    Self-driving cars and robots that run autonomously over long periods of time need high precision and up-to-date models of the environment. Natural environments contain dynamic objects and change over time. Since a permanent observation of “everything” is impossible and there will always be a first time visit of the changed area, a map that takes into account the possibility of change is needed.
    Team: Schachtschneider, Brenner
    Year: 2017
    Sponsors: DFG-Graduiertenkolleg i.c.sens

Bachelor Theses

  • Klassifikation von Mobile Mapping LiDAR Punktwolken
    In vielen Anwendungsgebieten der Geodäsie, beispielsweise dem des autonomen Fahrens, gewinnt die automatische Erkennung von Objekten in (urbanen) Regionen an Relevanz. Eingesetzt werden dafür verschiedene Aufnahmesysteme, dessen Daten in Echtzeit analysiert werden müssen. Besonders gut geeignet sind dafür Light Detection and Ranging (LiDAR) Punktwolken. In dieser Arbeit wird die Klassifikation von LiDAR Punktwolken verschiedener Methoden analysiert und bewertet. Als Datengrundlage dienten Scanstreifen aus einer Messkampagne des Instituts für Kartographie und Geoinformatik der Leibniz Universität Hannover. Mit Hilfe der Klassifikatoren Random Forests und Support Vector Machines konnten die einzelnen LiDAR Punkte 16 verschiedenen Klassen zugeordnet werden.
    Leaders: Brenner, Schachtschneider
    Team: Anat Schaper
    Year: 2020
  • Registration of point clouds using Least Squares Adjustment
    The goal of this thesis is to determine global transformation parameter for point cloud tiles or individual flight stripes using the information of local transformation parameters. The local transformation parameters should be derived using least square adjustment considering the different attributes of ALS and DIM point clouds. The quality of those local transformations should be used to weight the observations in a global alignment over a region, which will consequently return stable and uniform global registration parameters and thus will be able to support tiles with weak local transformation results.
    Team: Politz, Brenner
    Year: 2019
  • Registration of point clouds using segments
    The goal of this thesis is to develop different methods, which should register point clouds using segments. The registration on 2D- as well as on 3D-level should be investigated.
    Team: Politz, Brenner
    Year: 2019

Master Theses

  • Development of a Client-Server Module for Cooperative Multi-Robot Longterm Map Registration
    Nowadays a big amount of robots are used in production and logistic. Due to the large working environment, dynamic objects (e.g. humans or other robots), and semi-static objects (e.g.machine and furniture), a high performance navigation system is required. But only focus on the high performance long term SLAM on single robot is not enough to guarantee the flexible and accurate performance of whole robot fleet in large changing environment.
    Leaders: Tobias Ortmaier (IMES), Claus Brenner, Steffen Busch (IKG), Philipp Schnattinger (FraunhoferIPA)
    Team: Jiang Liwei
    Year: 2019
  • Classification and detection of road users using neural networks and Active Shape models
    Autonomous vehicles interpret their environment based on their sensor data. 360° laser scanners provide comprehensive and highly accurate information about the distance of objects. Predicting the behavior of road users differs between cars, trucks/buses, cyclists and pedestrians. The exact position of the different road users depends on their orientation and geometric dimensions. Active Shape models offer the possibility to estimate the center of objects by estimating deformable models, based on CAD plans and taking into account their orientation.
    Leaders: Bodo Rosenhahn (TNT), Claus Brenner, Steffen Busch (IKG)
    Team: Xiaoyu Jiang
    Year: 2019
  • Laser scanner-based prediction of pedestrian movements by filtering and classifying posture
    Against the background of road safety, an algorithm is presented below that uses point clouds to make the most accurate prediction possible about the future position of pedestrians. A core element is to classify the current state of movement of pedestrians over a random forest. The focus is on early detection of changes between individual states.
    Leaders: Claus Brenner, Steffen Busch
    Team: Matthias Fahrland
    Year: 2019
  • Robust registration of airborne point clouds
    Goal of this thesis is the robust registration of airborne point clouds, which are derived from Airborne Laser Scanning (ALS) and Dense Image Matching (DIM). We implemented a coarse, translative registration method using a Maximum Consensus Estimator and compared our results with a standard ICP. In addition, we tested several methods to prune object points from point clouds, which are represented differently in both point cloud types.
    Leaders: Politz, Brenner
    Team: Jannik Busse
    Year: 2019
  • Optimal assignment of point clouds using deep learning
    The main goal of this master thesis was to register airborne 3D point clouds from different sensor systems. These point clouds are derived from airborne laser scanning (ALS) and dense image matching (DIM) of aerial images. Those point clouds may cover the same surface, but do contain different attributes and characteristics. One major problem when dealing with those two point clouds is vegetation. The laser beam in ALS is able to penetrate vegetation leading to ground and vegetation points in the final point cloud. Since they are derived from aerial images, DIM point clouds only contain the surfaces and thus describes the treetops. This major difference between ALS and DIM causes problems for the registration of point clouds and established algorithms such as the iterative closest points (ICP) algorithm are facing issues when dealing with both point cloud types at the same time, because they assume that similar points are close to each other.
    Leaders: Brenner, Politz
    Team: Stephan Niehaus
    Year: 2019
  • Registration of point clouds using Least Squares Adjustment
    The goal of this thesis is to determine global transformation parameter for point cloud tiles or individual flight stripes using the information of local transformation parameters. The local transformation parameters should be derived using least square adjustment considering the different attributes of ALS and DIM point clouds. The quality of those local transformations should be used to weight the observations in a global alignment over a region, which will consequently return stable and uniform global registration parameters and thus will be able to support tiles with weak local transformation results.
    Team: Politz, Brenner
    Year: 2019
  • Registration of point clouds using segments
    The goal of this thesis is to develop different methods, which should register point clouds using segments. The registration on 2D- as well as on 3D-level should be investigated.
    Team: Politz, Brenner
    Year: 2019
  • Deep Learning for Flood Relevant Images and Texts from Social Media
    Floods are among Earth's most common and most destructive natural hazards. This work explores the idea of utilizing user-generated information from social media to recognize early signs of flood relevant events. The goal of this work lies in the development and implementation of a Deep Learning solution with the ability to detect the presence of flood relevant events from user-generated images and texts.
    Leaders: Yu Feng, Prof. Brenner
    Team: Sergiy Shebotnov
    Year: 2018
  • Robust visual navigation for autonomous underwater track vehicles
    Underwater track vehicles, also known as crawler, are universal carrier platforms for many different applications. Crawler having an autonomous navigation would enable the possibility of executing long-term observations without a connection to a base station. This thesis presents approaches that use previous knowledge about the scene that is integrated into motion estimation step by replacing RANSAC with PROSAC to make the motion estimation more robust.
    Leaders: Brenner, Kirchner
    Team: Lewin Probst
    Year: 2015
    Lifespan: 2015
  • Robotic exploration for mapping and change detection
    Autonomous systems and mobile robots become more and more part of our daily life. Examples are cutting the grass in the garden, helping us to get into a parking lot or cleaning the floor. The problems of localization, perception and automatic model building (e.g. maps) are central questions in mobile robotics. How to determine the absolute pose of a robot? What is the best way to explore an a priori unknown environment? Can changes be detected?
    Leaders: Brenner, Paffenholz
    Team: Sebastian Gangl
    Year: 2014
    Lifespan: 2014