Search Results for author: John W. Fisher III

Found 23 papers, 2 papers with code

CPU- and GPU-based Distributed Sampling in Dirichlet Process Mixtures for Large-scale Analysis

2 code implementations19 Apr 2022 Or Dinari, Raz Zamir, John W. Fisher III, Oren Freifeld

While Chang and Fisher III's implementation (written in MATLAB/C++) used only CPU and was designed for a single multi-core machine, the packages we proposed here distribute the computations efficiently across either multiple multi-core machines or across mutiple GPU streams.

Belief-Dependent Macro-Action Discovery in POMDPs using the Value of Information

no code implementations NeurIPS 2020 Genevieve Flaspohler, Nicholas A. Roy, John W. Fisher III

This work introduces macro-action discovery using value-of-information (VoI) for robust and efficient planning in partially observable Markov decision processes (POMDPs).

Lightweight Data Fusion with Conjugate Mappings

no code implementations20 Nov 2020 Christopher L. Dean, Stephen J. Lee, Jason Pacheco, John W. Fisher III

We present an approach to data fusion that combines the interpretability of structured probabilistic graphical models with the flexibility of neural networks.

Adaptive Scan Gibbs Sampler for Large Scale Inference Problems

no code implementations27 Jan 2018 Vadim Smolyakov, Qiang Liu, John W. Fisher III

For large scale on-line inference problems the update strategy is critical for performance.

Bayesian Nonparametric Modeling of Driver Behavior using HDP Split-Merge Sampling Algorithm

no code implementations27 Jan 2018 Vadim Smolyakov, Julian Straub, Sue Zheng, John W. Fisher III

In a novel manner, we demonstrate how the sparsity of the personal road network of a driver in conjunction with a hierarchical topic model allows data driven predictions about destinations as well as likely road conditions.

Position

Direction-Aware Semi-Dense SLAM

no code implementations18 Sep 2017 Julian Straub, Randi Cabezas, John Leonard, John W. Fisher III

To aide simultaneous localization and mapping (SLAM), future perception systems will incorporate forms of scene understanding.

Scene Understanding Segmentation +1

A Nonparametric Model for Multimodal Collaborative Activities Summarization

no code implementations4 Sep 2017 Guy Rosman, John W. Fisher III, Daniela Rus

We demonstrate the utility of this model for inference tasks such as activity detection, classification, and summarization.

Action Detection Activity Detection

Small-Variance Nonparametric Clustering on the Hypersphere

no code implementations CVPR 2015 Julian Straub, Trevor Campbell, Jonathan P. How, John W. Fisher III

Based on the small-variance limit of Bayesian nonparametric von-Mises-Fisher (vMF) mixture distributions, we propose two new flexible and efficient k-means-like clustering algorithms for directional data such as surface normals.

Clustering Nonparametric Clustering +1

Information-Driven Adaptive Structured-Light Scanners

no code implementations CVPR 2016 Guy Rosman, Daniela Rus, John W. Fisher III

We then demonstrate how different choices of relevant variable sets (corresponding to the subproblems of locatization and mapping) lead to different criteria for pattern selection and can be computed in an online fashion.

Pose Estimation

Efficient Global Point Cloud Alignment using Bayesian Nonparametric Mixtures

no code implementations CVPR 2017 Julian Straub, Trevor Campbell, Jonathan P. How, John W. Fisher III

Point cloud alignment is a common problem in computer vision and robotics, with applications ranging from 3D object recognition to reconstruction.

3D Object Recognition

Probabilistic Variational Bounds for Graphical Models

no code implementations NeurIPS 2015 Qiang Liu, John W. Fisher III, Alexander T. Ihler

We propose a simple Monte Carlo based inference method that augments convex variational bounds by adding importance sampling (IS).

Semantically-Aware Aerial Reconstruction From Multi-Modal Data

no code implementations ICCV 2015 Randi Cabezas, Julian Straub, John W. Fisher III

We consider a methodology for integrating multiple sensors along with semantic information to enhance scene representations.

Dreaming More Data: Class-dependent Distributions over Diffeomorphisms for Learned Data Augmentation

no code implementations9 Oct 2015 Søren Hauberg, Oren Freifeld, Anders Boesen Lindbo Larsen, John W. Fisher III, Lars Kai Hansen

We then learn a class-specific probabilistic generative models of the transformations in a Riemannian submanifold of the Lie group of diffeomorphisms.

Data Augmentation Feature Engineering

Coresets for k-Segmentation of Streaming Data

no code implementations NeurIPS 2014 Guy Rosman, Mikhail Volkov, Dan Feldman, John W. Fisher III, Daniela Rus

We consider the problem of computing optimal segmentation of such signals by k-piecewise linear function, using only one pass over the data by maintaining a coreset for the signal.

Segmentation Time Series +1

Aerial Reconstructions via Probabilistic Data Fusion

no code implementations CVPR 2014 Randi Cabezas, Oren Freifeld, Guy Rosman, John W. Fisher III

We propose an integrated probabilistic model for multi-modal fusion of aerial imagery, LiDAR data, and (optional) GPS measurements.

A Mixture of Manhattan Frames: Beyond the Manhattan World

no code implementations CVPR 2014 Julian Straub, Guy Rosman, Oren Freifeld, John J. Leonard, John W. Fisher III

Traditional approaches to scene representation exploit this phenomenon via the somewhat restrictive assumption that every plane is perpendicular to one of the axes of a single coordinate system.

Parallel Sampling of DP Mixture Models using Sub-Cluster Splits

no code implementations NeurIPS 2013 Jason Chang, John W. Fisher III

We present a novel MCMC sampler for Dirichlet process mixture models that can be used for conjugate or non-conjugate prior distributions.

valid

A Video Representation Using Temporal Superpixels

no code implementations CVPR 2013 Jason Chang, Donglai Wei, John W. Fisher III

We develop a generative probabilistic model for temporally consistent superpixels in video sequences.

Superpixels

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