Search Results for author: Guha Balakrishnan

Found 30 papers, 15 papers with code

Metric-guided Image Reconstruction Bounds via Conformal Prediction

1 code implementation23 Apr 2024 Matt Y Cheung, Tucker J Netherton, Laurence E Court, Ashok Veeraraghavan, Guha Balakrishnan

We apply our method to sparse-view CT for downstream radiotherapy planning and show 1) that metric-guided bounds have valid coverage for downstream metrics while conventional pixel-wise bounds do not and 2) anatomical differences of upper/lower bounds between metric-guided and pixel-wise methods.

ElasticDiffusion: Training-free Arbitrary Size Image Generation through Global-Local Content Separation

1 code implementation30 Nov 2023 Moayed Haji-Ali, Guha Balakrishnan, Vicente Ordonez

We propose ElasticDiffusion, a novel training-free decoding method that enables pretrained text-to-image diffusion models to generate images with various sizes.

Image Generation

GELDA: A generative language annotation framework to reveal visual biases in datasets

no code implementations29 Nov 2023 Krish Kabra, Kathleen M. Lewis, Guha Balakrishnan

Results on real datasets show that GELDA can generate accurate and diverse visual attribute suggestions, and uncover biases such as confounding between class labels and background features.

Attribute

Improving Denoising Diffusion Probabilistic Models via Exploiting Shared Representations

no code implementations27 Nov 2023 Delaram Pirhayatifard, Mohammad Taha Toghani, Guha Balakrishnan, César A. Uribe

In this work, we address the challenge of multi-task image generation with limited data for denoising diffusion probabilistic models (DDPM), a class of generative models that produce high-quality images by reversing a noisy diffusion process.

Denoising Few-Shot Learning +2

ISLAND: Informing Brightness and Surface Temperature Through a Land Cover-based Interpolator

no code implementations21 Sep 2023 Yuhao Liu, Pranavesh Panakkal, Sylvia Dee, Guha Balakrishnan, Jamie Padgett, Ashok Veeraraghavan

Our approach uses thermal infrared images from Landsat 8 (at 30 m resolution with 16-day revisit cycles) and the NLCD land cover dataset.

Blocking Time Series Analysis

CT Reconstruction from Few Planar X-rays with Application towards Low-resource Radiotherapy

1 code implementation4 Aug 2023 Yiran Sun, Tucker Netherton, Laurence Court, Ashok Veeraraghavan, Guha Balakrishnan

In this work, we propose a method to generate CT volumes from few (<5) planar X-ray observations using a prior data distribution, and perform the first evaluation of such a reconstruction algorithm for a clinical application: radiotherapy planning.

Anatomy SSIM

F?D: On understanding the role of deep feature spaces on face generation evaluation

no code implementations31 May 2023 Krish Kabra, Guha Balakrishnan

Moreover, FD using features from a face gender classifier emphasize hair length more than distances in an identity (recognition) feature space.

counterfactual Face Generation

Visualizing chest X-ray dataset biases using GANs

no code implementations29 Apr 2023 Hao Liang, Kevin Ni, Guha Balakrishnan

Recent work demonstrates that images from various chest X-ray datasets contain visual features that are strongly correlated with protected demographic attributes like race and gender.

Fairness

X-ray Recognition: Patient identification from X-rays using a contrastive objective

no code implementations29 Apr 2023 Hao Liang, Kevin Ni, Guha Balakrishnan

Recent research demonstrates that deep learning models are capable of precisely extracting bio-information (e. g. race, gender and age) from patients' Chest X-Rays (CXRs).

MadEye: Boosting Live Video Analytics Accuracy with Adaptive Camera Configurations

no code implementations4 Apr 2023 Mike Wong, Murali Ramanujam, Guha Balakrishnan, Ravi Netravali

Camera orientations (i. e., rotation and zoom) govern the content that a camera captures in a given scene, which in turn heavily influences the accuracy of live video analytics pipelines.

Knowledge Distillation

SplineCam: Exact Visualization and Characterization of Deep Network Geometry and Decision Boundaries

1 code implementation CVPR 2023 Ahmed Imtiaz Humayun, Randall Balestriero, Guha Balakrishnan, Richard Baraniuk

In this paper, we go one step further by developing the first provably exact method for computing the geometry of a DN's mapping - including its decision boundary - over a specified region of the data space.

Linking convolutional kernel size to generalization bias in face analysis CNNs

no code implementations7 Feb 2023 Hao Liang, Josue Ortega Caro, Vikram Maheshri, Ankit B. Patel, Guha Balakrishnan

Our framework is experimental, in that we train several versions of a network with an intervention to a specific hyperparameter, and measure the resulting causal effect of this choice on performance bias when a particular out-of-distribution image perturbation is applied.

Leveling Down in Computer Vision: Pareto Inefficiencies in Fair Deep Classifiers

no code implementations CVPR 2022 Dominik Zietlow, Michael Lohaus, Guha Balakrishnan, Matthäus Kleindessner, Francesco Locatello, Bernhard Schölkopf, Chris Russell

Algorithmic fairness is frequently motivated in terms of a trade-off in which overall performance is decreased so as to improve performance on disadvantaged groups where the algorithm would otherwise be less accurate.

Fairness

MINER: Multiscale Implicit Neural Representations

1 code implementation7 Feb 2022 Vishwanath Saragadam, Jasper Tan, Guha Balakrishnan, Richard G. Baraniuk, Ashok Veeraraghavan

We introduce a new neural signal model designed for efficient high-resolution representation of large-scale signals.

Image Reconstruction

Rayleigh EigenDirections (REDs): GAN latent space traversals for multidimensional features

no code implementations25 Jan 2022 Guha Balakrishnan, Raghudeep Gadde, Aleix Martinez, Pietro Perona

We present a method for finding paths in a deep generative model's latent space that can maximally vary one set of image features while holding others constant.

Matched sample selection with GANs for mitigating attribute confounding

1 code implementation24 Mar 2021 Chandan Singh, Guha Balakrishnan, Pietro Perona

Measuring biases of vision systems with respect to protected attributes like gender and age is critical as these systems gain widespread use in society.

Attribute Face Generation +3

Better Aggregation in Test-Time Augmentation

no code implementations ICCV 2021 Divya Shanmugam, Davis Blalock, Guha Balakrishnan, John Guttag

In this paper, we present 1) experimental analyses that shed light on cases in which the simple average is suboptimal and 2) a method to address these shortcomings.

Image Classification

Towards causal benchmarking of bias in face analysis algorithms

1 code implementation ECCV 2020 Guha Balakrishnan, Yuanjun Xiong, Wei Xia, Pietro Perona

To address this problem we develop an experimental method for measuring algorithmic bias of face analysis algorithms, which manipulates directly the attributes of interest, e. g., gender and skin tone, in order to reveal causal links between attribute variation and performance change.

Attribute Benchmarking +2

Painting Many Pasts: Synthesizing Time Lapse Videos of Paintings

1 code implementation CVPR 2020 Amy Zhao, Guha Balakrishnan, Kathleen M. Lewis, Frédo Durand, John V. Guttag, Adrian V. Dalca

We present a probabilistic model that, given a single image of a completed painting, recurrently synthesizes steps of the painting process.

Unsupervised Learning of Probabilistic Diffeomorphic Registration for Images and Surfaces

1 code implementation8 Mar 2019 Adrian V. Dalca, Guha Balakrishnan, John Guttag, Mert R. Sabuncu

We present a probabilistic generative model and derive an unsupervised learning-based inference algorithm that uses insights from classical registration methods and makes use of recent developments in convolutional neural networks (CNNs).

Constrained Diffeomorphic Image Registration Deformable Medical Image Registration +2

VoxelMorph: A Learning Framework for Deformable Medical Image Registration

6 code implementations14 Sep 2018 Guha Balakrishnan, Amy Zhao, Mert R. Sabuncu, John Guttag, Adrian V. Dalca

In contrast to this approach, and building on recent learning-based methods, we formulate registration as a function that maps an input image pair to a deformation field that aligns these images.

Deformable Medical Image Registration Diffeomorphic Medical Image Registration +1

Unsupervised Learning for Fast Probabilistic Diffeomorphic Registration

2 code implementations11 May 2018 Adrian V. Dalca, Guha Balakrishnan, John Guttag, Mert R. Sabuncu

We demonstrate our method on a 3D brain registration task, and provide an empirical analysis of the algorithm.

Synthesizing Images of Humans in Unseen Poses

1 code implementation CVPR 2018 Guha Balakrishnan, Amy Zhao, Adrian V. Dalca, Fredo Durand, John Guttag

Given an image of a person and a desired pose, we produce a depiction of that person in that pose, retaining the appearance of both the person and background.

Image Generation

A Video-Based Method for Objectively Rating Ataxia

no code implementations13 Dec 2016 Ronnachai Jaroensri, Amy Zhao, Guha Balakrishnan, Derek Lo, Jeremy Schmahmann, John Guttag, Fredo Durand

The performance of our system is comparable to that of a group of ataxia specialists in terms of mean error and correlation, and our system's predictions were consistently within the range of inter-rater variability.

Optical Flow Estimation Pose Estimation

Detecting Pulse from Head Motions in Video

no code implementations CVPR 2013 Guha Balakrishnan, Fredo Durand, John Guttag

We extract heart rate and beat lengths from videos by measuring subtle head motion caused by the Newtonian reaction to the influx of blood at each beat.

Heart Rate Variability

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