7,972 research outputs found
Leveraging Long-Term Predictions and Online Learning in Agent-Based Multiple Person Tracking
We present a multiple-person tracking algorithm, based on combining particle fi lters and RVO, an agent-based crowd model that infers collision-free velocities so as to predict pedestrian's motion. In addition to position and velocity, our tracking algorithm can estimate the internal goals (desired destination or desired velocity) of the tracked pedestrian in an online manner, thus removing the need to specify this information beforehand. Furthermore, we leverage the longer-term predictions of RVO by deriving a higher-order particle fllter, which aggregates multiple predictions from different prior time steps. This yields a tracker that can recover from short-term occlusions and spurious noise in the appearance model. Experimental results show that our tracking algorithm is suitable for predicting pedestrians' behaviors online without needing scene priors or hand-annotated goal information, and improves tracking in real-world crowded scenes under low frame rates
Data-Centric Epidemic Forecasting: A Survey
The COVID-19 pandemic has brought forth the importance of epidemic
forecasting for decision makers in multiple domains, ranging from public health
to the economy as a whole. While forecasting epidemic progression is frequently
conceptualized as being analogous to weather forecasting, however it has some
key differences and remains a non-trivial task. The spread of diseases is
subject to multiple confounding factors spanning human behavior, pathogen
dynamics, weather and environmental conditions. Research interest has been
fueled by the increased availability of rich data sources capturing previously
unobservable facets and also due to initiatives from government public health
and funding agencies. This has resulted, in particular, in a spate of work on
'data-centered' solutions which have shown potential in enhancing our
forecasting capabilities by leveraging non-traditional data sources as well as
recent innovations in AI and machine learning. This survey delves into various
data-driven methodological and practical advancements and introduces a
conceptual framework to navigate through them. First, we enumerate the large
number of epidemiological datasets and novel data streams that are relevant to
epidemic forecasting, capturing various factors like symptomatic online
surveys, retail and commerce, mobility, genomics data and more. Next, we
discuss methods and modeling paradigms focusing on the recent data-driven
statistical and deep-learning based methods as well as on the novel class of
hybrid models that combine domain knowledge of mechanistic models with the
effectiveness and flexibility of statistical approaches. We also discuss
experiences and challenges that arise in real-world deployment of these
forecasting systems including decision-making informed by forecasts. Finally,
we highlight some challenges and open problems found across the forecasting
pipeline.Comment: 67 pages, 12 figure
Fusion-GRU: A Deep Learning Model for Future Bounding Box Prediction of Traffic Agents in Risky Driving Videos
To ensure the safe and efficient navigation of autonomous vehicles and
advanced driving assistance systems in complex traffic scenarios, predicting
the future bounding boxes of surrounding traffic agents is crucial. However,
simultaneously predicting the future location and scale of target traffic
agents from the egocentric view poses challenges due to the vehicle's egomotion
causing considerable field-of-view changes. Moreover, in anomalous or risky
situations, tracking loss or abrupt motion changes limit the available
observation time, requiring learning of cues within a short time window.
Existing methods typically use a simple concatenation operation to combine
different cues, overlooking their dynamics over time. To address this, this
paper introduces the Fusion-Gated Recurrent Unit (Fusion-GRU) network, a novel
encoder-decoder architecture for future bounding box localization. Unlike
traditional GRUs, Fusion-GRU accounts for mutual and complex interactions among
input features. Moreover, an intermediary estimator coupled with a
self-attention aggregation layer is also introduced to learn sequential
dependencies for long range prediction. Finally, a GRU decoder is employed to
predict the future bounding boxes. The proposed method is evaluated on two
publicly available datasets, ROL and HEV-I. The experimental results showcase
the promising performance of the Fusion-GRU, demonstrating its effectiveness in
predicting future bounding boxes of traffic agents
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