Traffic data reconstruction based on Markov random field modeling

用于短期交通流量预测的混合隐马尔可夫 LSTM

Hybrid hidden Markov LSTM for short-term traffic flow prediction

本文针对短期交通流量预测，结合 HMM 的状态机制识别能力与 LSTM 的长期时序建模能力，提出混合 hidden Markov-LSTM，显著优于 Markov switching ARIMA 和 LSTM。

Bayesian Reconstruction of Missing Observations

We focus on an interpolation method referred to Bayesian reconstruction in this paper. Whereas in standard interpolation methods missing data are interpolated deterministically, in Bayesian reconstruction, missing data are interpolated probabilistically using a Bayesian treatment. In this paper, we address the framework of Bayesian reconstruction and its application to the traffic data reconstruction problem in the field of traffic engineering. In the latter part of this paper, we describe the evaluation of the statistical performance of our Bayesian traffic reconstruction model using a statis…

用于曲线重建与点云数据分析的贝叶斯方法及马尔可夫链蒙特卡洛算法

Bayesian methods and Markov chain Monte Carlo algorithms for curve reconstruction and point cloud data analysis

本文针对点云数据量大、含噪声及缺失信息，现有重建无不确定性量化的问题，提出全贝叶斯框架与适配的MCMC采样器，经合成及LiDAR数据实验，实现精确曲线重建与不确定性量化。

Traffic Data Imputation using Deep Convolutional Neural Networks

We propose a statistical learning-based traffic speed estimation method that uses sparse vehicle trajectory information. Using a convolutional encoder-decoder based architecture, we show that a well trained neural network can learn spatio-temporal traffic speed dynamics from time-space diagrams. We demonstrate this for a homogeneous road section using simulated vehicle trajectories and then validate it using real-world data from NGSIM. Our results show that with probe vehicle penetration levels as low as 5\%, the proposed estimation method can provide a sound reconstruction of macroscopic traf…

A Driving Intention Prediction Method Based on Hidden Markov Model for Autonomous Driving

In a mixed-traffic scenario where both autonomous vehicles and human-driving vehicles exist, a timely prediction of driving intentions of nearby human-driving vehicles is essential for the safe and efficient driving of an autonomous vehicle. In this paper, a driving intention prediction method based on Hidden Markov Model (HMM) is proposed for autonomous vehicles. HMMs representing different driving intentions are trained and tested with field collected data from a flyover. When training the models, either discrete or continuous characterization of the mobility features of vehicles is applied.…

Learning Traffic Flow Dynamics using Random Fields

This paper presents a mesoscopic traffic flow model that explicitly describes the spatio-temporal evolution of the probability distributions of vehicle trajectories. The dynamics are represented by a sequence of factor graphs, which enable learning of traffic dynamics from limited Lagrangian measurements using an efficient message passing technique. The approach ensures that estimated speeds and traffic densities are non-negative with probability one. The estimation technique is tested using vehicle trajectory datasets generated using an independent microscopic traffic simulator and is shown t…