Search Results for author: Punarjay Chakravarty

Found 24 papers, 7 papers with code

Ref-DVGO: Reflection-Aware Direct Voxel Grid Optimization for an Improved Quality-Efficiency Trade-Off in Reflective Scene Reconstruction

1 code implementation16 Aug 2023 Georgios Kouros, Minye Wu, Shubham Shrivastava, Sushruth Nagesh, Punarjay Chakravarty, Tinne Tuytelaars

To this end, we investigate an implicit-explicit approach based on conventional volume rendering to enhance the reconstruction quality and accelerate the training and rendering processes.

Novel View Synthesis

Locking On: Leveraging Dynamic Vehicle-Imposed Motion Constraints to Improve Visual Localization

no code implementations30 Jun 2023 Stephen Hausler, Sourav Garg, Punarjay Chakravarty, Shubham Shrivastava, Ankit Vora, Michael Milford

In this research, we propose a middle ground, demonstrated in the context of autonomous vehicles, using dynamic vehicles to provide limited pose constraint information in a 6-DoF frame-by-frame PnP-RANSAC localization pipeline.

Autonomous Vehicles Visual Localization

DisPlacing Objects: Improving Dynamic Vehicle Detection via Visual Place Recognition under Adverse Conditions

no code implementations30 Jun 2023 Stephen Hausler, Sourav Garg, Punarjay Chakravarty, Shubham Shrivastava, Ankit Vora, Michael Milford

In this work we investigate whether a prior map can be leveraged to aid in the detection of dynamic objects in a scene without the need for a 3D map or pixel-level map-query correspondences.

Binary Classification Visual Place Recognition

FQDet: Fast-converging Query-based Detector

2 code implementations5 Oct 2022 Cédric Picron, Punarjay Chakravarty, Tinne Tuytelaars

Recently, two-stage Deformable DETR introduced the query-based two-stage head, a new type of two-stage head different from the region-based two-stage heads of classical detectors as Faster R-CNN.

Designing MacPherson Suspension Architectures using Bayesian Optimization

no code implementations17 Jun 2022 Sinnu Susan Thomas, Jacopo Palandri, Mohsen Lakehal-ayat, Punarjay Chakravarty, Friedrich Wolf-Monheim, Matthew B. Blaschko

We show that the proposed approach is general, scalable, and efficient, and that the novel convergence criteria can be implemented straightforwardly based on existing concepts and subroutines in popular Bayesian optimization software packages.

Bayesian Optimization

Propagating State Uncertainty Through Trajectory Forecasting

1 code implementation7 Oct 2021 Boris Ivanovic, Yifeng Lin, Shubham Shrivastava, Punarjay Chakravarty, Marco Pavone

As a result, perceptual uncertainties are not propagated through forecasting and predictions are frequently overconfident.

Trajectory Forecasting

S-BEV: Semantic Birds-Eye View Representation for Weather and Lighting Invariant 3-DoF Localization

no code implementations23 Jan 2021 Mokshith Voodarla, Shubham Shrivastava, Sagar Manglani, Ankit Vora, Siddharth Agarwal, Punarjay Chakravarty

We describe a light-weight, weather and lighting invariant, Semantic Bird's Eye View (S-BEV) signature for vision-based vehicle re-localization.

An A* Curriculum Approach to Reinforcement Learning for RGBD Indoor Robot Navigation

no code implementations5 Jan 2021 Kaushik Balakrishnan, Punarjay Chakravarty, Shubham Shrivastava

Training robots to navigate diverse environments is a challenging problem as it involves the confluence of several different perception tasks such as mapping and localization, followed by optimal path-planning and control.

Navigate reinforcement-learning +2

Sim2Real for Self-Supervised Monocular Depth and Segmentation

1 code implementation1 Dec 2020 Nithin Raghavan, Punarjay Chakravarty, Shubham Shrivastava

Image-based learning methods for autonomous vehicle perception tasks require large quantities of labelled, real data in order to properly train without overfitting, which can often be incredibly costly.

Domain Adaptation

What My Motion tells me about Your Pose: A Self-Supervised Monocular 3D Vehicle Detector

no code implementations29 Jul 2020 Cédric Picron, Punarjay Chakravarty, Tom Roussel, Tinne Tuytelaars

We subsequently demonstrate an optimization-based monocular 3D bounding box detector built on top of the self-supervised vehicle orientation estimator without the requirement of expensive labeled data.

Autonomous Vehicles Domain Adaptation +1

Deflating Dataset Bias Using Synthetic Data Augmentation

no code implementations28 Apr 2020 Nikita Jaipuria, Xianling Zhang, Rohan Bhasin, Mayar Arafa, Punarjay Chakravarty, Shubham Shrivastava, Sagar Manglani, Vidya N. Murali

Deep Learning has seen an unprecedented increase in vision applications since the publication of large-scale object recognition datasets and introduction of scalable compute hardware.

Data Augmentation Lane Detection +3

Deep-Geometric 6 DoF Localization from a Single Image in Topo-metric Maps

no code implementations4 Feb 2020 Tom Roussel, Punarjay Chakravarty, Gaurav Pandey, Tinne Tuytelaars, Luc Van Eycken

We describe a Deep-Geometric Localizer that is able to estimate the full 6 Degree of Freedom (DoF) global pose of the camera from a single image in a previously mapped environment.

Pose Estimation

GEN-SLAM: Generative Modeling for Monocular Simultaneous Localization and Mapping

no code implementations6 Feb 2019 Punarjay Chakravarty, Praveen Narayanan, Tom Roussel

We present a Deep Learning based system for the twin tasks of localization and obstacle avoidance essential to any mobile robot.

Depth Estimation Simultaneous Localization and Mapping

Expert Gate: Lifelong Learning with a Network of Experts

2 code implementations CVPR 2017 Rahaf Aljundi, Punarjay Chakravarty, Tinne Tuytelaars

Further, the autoencoders inherently capture the relatedness of one task to another, based on which the most relevant prior model to be used for training a new expert, with finetuning or learning without-forgetting, can be selected.

Image Classification Video Prediction

Cross-modal Supervision for Learning Active Speaker Detection in Video

no code implementations29 Mar 2016 Punarjay Chakravarty, Tinne Tuytelaars

We further improve a generic model for active speaker detection by learning person specific models.

Action Detection Activity Detection

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