Search Results for author: Piyush M. Mehta

Found 13 papers, 1 papers with code

Neural-based Video Compression on Solar Dynamics Observatory Images

no code implementations12 Jul 2024 Atefeh Khoshkhahtinat, Ali Zafari, Piyush M. Mehta, Nasser M. Nasrabadi, Barbara J. Thompson, Michael S. F. Kirk, Daniel da Silva

In this work, we introduce an architecture based on the Transformer model, which is specifically designed to capture both local and global information from input images in an effective and efficient manner.

Data Compression Video Compression

Neural-based Compression Scheme for Solar Image Data

no code implementations6 Nov 2023 Ali Zafari, Atefeh Khoshkhahtinat, Jeremy A. Grajeda, Piyush M. Mehta, Nasser M. Nasrabadi, Laura E. Boucheron, Barbara J. Thompson, Michael S. F. Kirk, Daniel da Silva

In this work, we propose an adversarially trained neural network, equipped with local and non-local attention modules to capture both the local and global structure of the image resulting in a better trade-off in rate-distortion (RD) compared to conventional hand-engineered codecs.

Image Compression

Multi-Context Dual Hyper-Prior Neural Image Compression

no code implementations19 Sep 2023 Atefeh Khoshkhahtinat, Ali Zafari, Piyush M. Mehta, Mohammad Akyash, Hossein Kashiani, Nasser M. Nasrabadi

In addition, we introduce a novel entropy model that incorporates two different hyperpriors to model cross-channel and spatial dependencies of the latent representation.

Image Compression

Multi-spectral Entropy Constrained Neural Compression of Solar Imagery

no code implementations19 Sep 2023 Ali Zafari, Atefeh Khoshkhahtinat, Piyush M. Mehta, Nasser M. Nasrabadi, Barbara J. Thompson, Michael S. F. Kirk, Daniel da Silva

Recently successful end-to-end optimized neural network-based image compression systems have shown great potential to be used in an ad-hoc manner.

Image Compression

Probabilistic Solar Proxy Forecasting with Neural Network Ensembles

no code implementations3 Jun 2023 Joshua D. Daniell, Piyush M. Mehta

The best models found in this work are ensemble approaches using multi step or a combination of multi step and dynamic predictions.

Attention-Based Generative Neural Image Compression on Solar Dynamics Observatory

no code implementations12 Oct 2022 Ali Zafari, Atefeh Khoshkhahtinat, Piyush M. Mehta, Nasser M. Nasrabadi, Barbara J. Thompson, Daniel da Silva, Michael S. F. Kirk

We have designed an ad-hoc ANN-based image compression scheme to reduce the amount of data needed to be stored and retrieved on space missions studying solar dynamics.

Image Compression

Calibrated and Enhanced NRLMSIS 2.0 Model with Uncertainty Quantification

no code implementations24 Aug 2022 Richard J. Licata, Piyush M. Mehta, Daniel R. Weimer, W. Kent Tobiska, Jean Yoshii

In this work, we develop an exospheric temperature model based in machine learning (ML) that can be used with NRLMSIS 2. 0 to calibrate it relative to high-fidelity satellite density estimates.

Uncertainty Quantification

Science through Machine Learning: Quantification of Poststorm Thermospheric Cooling

no code implementations12 Jun 2022 Richard J. Licata, Piyush M. Mehta, Daniel R. Weimer, Douglas P. Drob, W. Kent Tobiska, Jean Yoshii

Machine learning (ML) is often viewed as a black-box regression technique that is unable to provide considerable scientific insight.

BIG-bench Machine Learning

Uncertainty Quantification Techniques for Space Weather Modeling: Thermospheric Density Application

no code implementations6 Jan 2022 Richard J. Licata, Piyush M. Mehta

For the global model regressed on the SET HASDM density database, we achieve errors of 11% on independent test data with well-calibrated uncertainty estimates.

Collision Avoidance Prediction Intervals +1

Machine-Learned HASDM Model with Uncertainty Quantification

no code implementations16 Sep 2021 Richard J. Licata, Piyush M. Mehta, W. Kent Tobiska, S. Huzurbazar

These models leverage Monte Carlo (MC) dropout to provide uncertainty estimates, and the use of the NLPD loss function results in well-calibrated uncertainty estimates without sacrificing model accuracy (<10% mean absolute error).

Dimensionality Reduction Uncertainty Quantification

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