9,127 research outputs found
Enhancing Mobile Object Classification Using Geo-referenced Maps and Evidential Grids
Evidential grids have recently shown interesting properties for mobile object
perception. Evidential grids are a generalisation of Bayesian occupancy grids
using Dempster- Shafer theory. In particular, these grids can handle
efficiently partial information. The novelty of this article is to propose a
perception scheme enhanced by geo-referenced maps used as an additional source
of information, which is fused with a sensor grid. The paper presents the key
stages of such a data fusion process. An adaptation of conjunctive combination
rule is presented to refine the analysis of the conflicting information. The
method uses temporal accumulation to make the distinction between stationary
and mobile objects, and applies contextual discounting for modelling
information obsolescence. As a result, the method is able to better
characterise the occupied cells by differentiating, for instance, moving
objects, parked cars, urban infrastructure and buildings. Experiments carried
out on real- world data illustrate the benefits of such an approach.Comment: 6 pp. arXiv admin note: substantial text overlap with arXiv:1207.101
Dynamic Occupancy Grid Prediction for Urban Autonomous Driving: A Deep Learning Approach with Fully Automatic Labeling
Long-term situation prediction plays a crucial role in the development of
intelligent vehicles. A major challenge still to overcome is the prediction of
complex downtown scenarios with multiple road users, e.g., pedestrians, bikes,
and motor vehicles, interacting with each other. This contribution tackles this
challenge by combining a Bayesian filtering technique for environment
representation, and machine learning as long-term predictor. More specifically,
a dynamic occupancy grid map is utilized as input to a deep convolutional
neural network. This yields the advantage of using spatially distributed
velocity estimates from a single time step for prediction, rather than a raw
data sequence, alleviating common problems dealing with input time series of
multiple sensors. Furthermore, convolutional neural networks have the inherent
characteristic of using context information, enabling the implicit modeling of
road user interaction. Pixel-wise balancing is applied in the loss function
counteracting the extreme imbalance between static and dynamic cells. One of
the major advantages is the unsupervised learning character due to fully
automatic label generation. The presented algorithm is trained and evaluated on
multiple hours of recorded sensor data and compared to Monte-Carlo simulation
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