Search Results for author: David A. Clausi

Found 21 papers, 2 papers with code

Evaluating deep tracking models for player tracking in broadcast ice hockey video

no code implementations22 May 2022 Kanav Vats, Mehrnaz Fani, David A. Clausi, John S. Zelek

Tracking and identifying players is an important problem in computer vision based ice hockey analytics.

Understanding the Effects of Second-Order Approximations in Natural Policy Gradient Reinforcement Learning

1 code implementation22 Jan 2022 Brennan Gebotys, Alexander Wong, David A. Clausi

Natural policy gradient methods are popular reinforcement learning methods that improve the stability of policy gradient methods by utilizing second-order approximations to precondition the gradient with the inverse of the Fisher-information matrix.

Policy Gradient Methods reinforcement-learning +1

M2A: Motion Aware Attention for Accurate Video Action Recognition

1 code implementation18 Nov 2021 Brennan Gebotys, Alexander Wong, David A. Clausi

We further compared the performance of M2A with other state-of-the-art motion and attention mechanisms on the Something-Something V1 video action recognition benchmark.

Action Recognition Temporal Action Localization +1

Player Tracking and Identification in Ice Hockey

no code implementations6 Oct 2021 Kanav Vats, Pascale Walters, Mehrnaz Fani, David A. Clausi, John Zelek

The player identification model further takes advantage of the available NHL game roster data to obtain a player identification accuracy of 83%.

Event Detection Multi-Object Tracking

Multi-task learning for jersey number recognition in Ice Hockey

no code implementations17 Aug 2021 Kanav Vats, Mehrnaz Fani, David A. Clausi, John Zelek

Identifying players in sports videos by recognizing their jersey numbers is a challenging task in computer vision.

Multi-Task Learning

Sentinel-1 Additive Noise Removal from Cross-Polarization Extra-Wide TOPSAR with Dynamic Least-Squares

no code implementations12 Jul 2021 Peter Q. Lee, Linlin Xu, David A. Clausi

We consider a linear denoising model that re-scales the noise field for each subswath, whose parameters are found from a least-squares solution over the objective function.

Denoising

Puck localization and multi-task event recognition in broadcast hockey videos

no code implementations21 May 2021 Kanav Vats, Mehrnaz Fani, David A. Clausi, John Zelek

In this paper, we introduce and implement a network for puck localization in broadcast hockey video.

Multi-Task Learning

Localization of Ice-Rink for Broadcast Hockey Videos

no code implementations22 Apr 2021 Mehrnaz Fani, Pascale Berunelle Walters, David A. Clausi, John Zelek, Alexander Wong

To localize the frames on the ice-rink model, a ResNet18-based regressor is implemented and trained, which regresses to four control points on the model in a frame-by-frame fashion.

Homography Estimation

Event detection in coarsely annotated sports videos via parallel multi receptive field 1D convolutions

no code implementations13 Apr 2020 Kanav Vats, Mehrnaz Fani, Pascale Walters, David A. Clausi, John Zelek

Experimental results demonstrate the effectiveness of the network by obtaining a 55% average F1 score on the NHL dataset and by achieving competitive performance compared to the state of the art on the SoccerNet dataset.

Action Spotting Event Detection

PuckNet: Estimating hockey puck location from broadcast video

no code implementations11 Dec 2019 Kanav Vats, William McNally, Chris Dulhanty, Zhong Qiu Lin, David A. Clausi, John Zelek

The network is able to regress the puck location from broadcast hockey video clips with varying camera angles.

Generative Adversarial Networks and Conditional Random Fields for Hyperspectral Image Classification

no code implementations12 May 2019 Zilong Zhong, Jonathan Li, David A. Clausi, Alexander Wong

In this paper, we address the hyperspectral image (HSI) classification task with a generative adversarial network and conditional random field (GAN-CRF) -based framework, which integrates a semi-supervised deep learning and a probabilistic graphical model, and make three contributions.

Classification General Classification +2

KPTransfer: improved performance and faster convergence from keypoint subset-wise domain transfer in human pose estimation

no code implementations24 Mar 2019 Kanav Vats, Helmut Neher, Alexander Wong, David A. Clausi, John Zelek

This approach is motivated by the notion that rich contextual knowledge can be transferred between different keypoint subsets representing separate domains.

Keypoint Detection

SISC: End-to-end Interpretable Discovery Radiomics-Driven Lung Cancer Prediction via Stacked Interpretable Sequencing Cells

no code implementations15 Jan 2019 Vignesh Sankar, Devinder Kumar, David A. Clausi, Graham W. Taylor, Alexander Wong

Conclusion: The SISC radiomic sequencer is able to achieve state-of-the-art results in lung cancer prediction, and also offers prediction interpretability in the form of critical response maps.

Computed Tomography (CT) Decision Making

Spatial probabilistic pulsatility model for enhancing photoplethysmographic imaging systems

no code implementations27 Jul 2016 Robert Amelard, David A. Clausi, Alexander Wong

Here, we developed a continuous probabilistic pulsatility model for importance-weighted blood pulse waveform extraction.

Density Estimation Heart rate estimation

A spectral-spatial fusion model for robust blood pulse waveform extraction in photoplethysmographic imaging

no code implementations29 Jun 2016 Robert Amelard, David A. Clausi, Alexander Wong

Here, we design and implement a signal fusion framework, FusionPPG, for extracting a blood pulse waveform signal with strong temporal fidelity from a scene without requiring anatomical priors (e. g., facial tracking).

Non-contact hemodynamic imaging reveals the jugular venous pulse waveform

no code implementations15 Apr 2016 Robert Amelard, Richard L Hughson, Danielle K Greaves, Kaylen J. Pfisterer, Jason Leung, David A. Clausi, Alexander Wong

Here, we demonstrate for the first time that the JVP can be consistently observed in a non-contact manner using a novel light-based photoplethysmographic imaging system, coded hemodynamic imaging (CHI).

Numerical Demultiplexing of Color Image Sensor Measurements via Non-linear Random Forest Modeling

no code implementations17 Dec 2015 Jason Deglint, Farnoud Kazemzadeh, Daniel Cho, David A. Clausi, Alexander Wong

A numerical demultiplexer is then learned via non-linear random forest modeling based on the forward model.

Non-contact transmittance photoplethysmographic imaging (PPGI) for long-distance cardiovascular monitoring

no code implementations23 Mar 2015 Robert Amelard, Christian Scharfenberger, Farnoud Kazemzadeh, Kaylen J. Pfisterer, Bill S. Lin, Alexander Wong, David A. Clausi

The results support the hypothesis that long-distance heart rate monitoring is feasible using transmittance PPGI, allowing for new possibilities of monitoring cardiovascular function in a non-contact manner.

Photoplethysmography (PPG)

Unsupervised image segmentation using a simple MRF model with a new implementation scheme

no code implementations Pattern Recognition 37 2004 Huawu Deng, David A. Clausi

Using this method, the simple MRF model is able to automatically estimate model parameters and produce accurate unsupervised segmentation results.

Image Segmentation Segmentation +2

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