Search Results for author: Oliver Cossairt

Found 35 papers, 11 papers with code

3D Imaging of Complex Specular Surfaces by Fusing Polarimetric and Deflectometric Information

no code implementations4 Jun 2024 Jiazhang Wang, Oliver Cossairt, Florian Willomitzer

Accurate and fast 3D imaging of specular surfaces still poses major challenges for state-of-the-art optical measurement principles.

Event-based Shape from Polarization with Spiking Neural Networks

no code implementations26 Dec 2023 Peng Kang, Srutarshi Banerjee, Henry Chopp, Aggelos Katsaggelos, Oliver Cossairt

Recent advances in event-based shape determination from polarization offer a transformative approach that tackles the trade-off between speed and accuracy in capturing surface geometries.

Surface Normal Estimation

Event-based Motion-Robust Accurate Shape Estimation for Mixed Reflectance Scenes

no code implementations16 Nov 2023 Aniket Dashpute, Jiazhang Wang, James Taylor, Oliver Cossairt, Ashok Veeraraghavan, Florian Willomitzer

In this paper, we present a novel event-based structured light system that enables fast 3D imaging of mixed reflectance scenes with high accuracy.

Accurate Eye Tracking from Dense 3D Surface Reconstructions using Single-Shot Deflectometry

no code implementations14 Aug 2023 Jiazhang Wang, Tianfu Wang, Bingjie Xu, Oliver Cossairt, Florian Willomitzer

Eye-tracking plays a crucial role in the development of virtual reality devices, neuroscience research, and psychology.

Stochastic Light Field Holography

no code implementations12 Jul 2023 Florian Schiffers, PRANEETH CHAKRAVARTHULA, Nathan Matsuda, Grace Kuo, Ethan Tseng, Douglas Lanman, Felix Heide, Oliver Cossairt

The Visual Turing Test is the ultimate goal to evaluate the realism of holographic displays.

Thermal Spread Functions (TSF): Physics-guided Material Classification

1 code implementation CVPR 2023 Aniket Dashpute, Vishwanath Saragadam, Emma Alexander, Florian Willomitzer, Aggelos Katsaggelos, Ashok Veeraraghavan, Oliver Cossairt

Our key observation is that the rate of heating and cooling of an object depends on the unique intrinsic properties of the material, namely the emissivity and diffusivity.

Classification Material Classification +1

Optimization-Based Eye Tracking using Deflectometric Information

no code implementations9 Mar 2023 Tianfu Wang, Jiazhang Wang, Oliver Cossairt, Florian Willomitzer

Eye tracking is an important tool with a wide range of applications in Virtual, Augmented, and Mixed Reality (VR/AR/MR) technologies.

Inverse Rendering Mixed Reality

Single-shot ToF sensing with sub-mm precision using conventional CMOS sensors

no code implementations2 Dec 2022 Manuel Ballester, Heming Wang, Jiren Li, Oliver Cossairt, Florian Willomitzer

We present 3D measurements of small (cm-sized) objects with > 2 Mp point cloud resolution (the resolution of our used detector) and up to sub-mm depth precision.

Object Retrieval

Boost Event-Driven Tactile Learning with Location Spiking Neurons

1 code implementation9 Oct 2022 Peng Kang, Srutarshi Banerjee, Henry Chopp, Aggelos Katsaggelos, Oliver Cossairt

Moreover, to demonstrate the representation effectiveness of our proposed neurons and capture the complex spatio-temporal dependencies in the event-driven tactile data, we exploit the location spiking neurons to propose two hybrid models for event-driven tactile learning.

Graph Neural Network

Event-Driven Tactile Learning with Location Spiking Neurons

1 code implementation23 Jul 2022 Peng Kang, Srutarshi Banerjee, Henry Chopp, Aggelos Katsaggelos, Oliver Cossairt

In this paper, to improve the representative capabilities of existing spiking neurons, we propose a novel neuron model called "location spiking neuron", which enables us to extract features of event-based data in a novel way.

Denoising Fast X-Ray Fluorescence Raster Scans of Paintings

no code implementations3 Jun 2022 Henry Chopp, Alicia McGeachy, Matthias Alfeld, Oliver Cossairt, Marc Walton, Aggelos Katsaggelos

Macro x-ray fluorescence (XRF) imaging of cultural heritage objects, while a popular non-invasive technique for providing elemental distribution maps, is a slow acquisition process in acquiring high signal-to-noise ratio XRF volumes.

Denoising Dictionary Learning

Investigating the Potential of Auxiliary-Classifier GANs for Image Classification in Low Data Regimes

no code implementations22 Jan 2022 Amil Dravid, Florian Schiffers, Yunan Wu, Oliver Cossairt, Aggelos K. Katsaggelos

Generative Adversarial Networks (GANs) have shown promise in augmenting datasets and boosting convolutional neural networks' (CNN) performance on image classification tasks.

Classification Image Classification +1

Anatomy of a superorganism -- structure and growth dynamics of army ant bivouacs

no code implementations18 Oct 2021 Thomas Bochynek, Florian Schiffers, André Aichert, Oliver Cossairt, Simon Garnier, Michael Rubenstein

Beyond unicellular and multicellular organisms, there is a third type of structural complexity in living animals: that of the mechanical self-assembly of groups of distinct multicellular organisms into dynamical, functional structures.

Anatomy

LiveView: Dynamic Target-Centered MPI for View Synthesis

no code implementations11 Jul 2021 Sushobhan Ghosh, Zhaoyang Lv, Nathan Matsuda, Lei Xiao, Andrew Berkovich, Oliver Cossairt

Existing Multi-Plane Image (MPI) based view-synthesis methods generate an MPI aligned with the input view using a fixed number of planes in one forward pass.

Novel View Synthesis

Plot2Spectra: an Automatic Spectra Extraction Tool

1 code implementation6 Jul 2021 Weixin Jiang, Eric Schwenker, Trevor Spreadbury, Kai Li, Maria K. Y. Chan, Oliver Cossairt

In scientific literature, XANES/Raman data are usually plotted in line graphs which is a visually appropriate way to represent the information when the end-user is a human reader.

Optical Flow Estimation Semantic Segmentation

Improving Acquisition Speed of X-Ray Ptychography through Spatial Undersampling and Regularization

no code implementations20 May 2021 Prasan Shedligeri, Florian Schiffers, Semih Barutcu, Pablo Ruiz, Aggelos K Katsaggelos, Oliver Cossairt

To avoid the ill-posedness, we investigate the effect of regularizing the phase retrieval algorithm with image priors for various overlap ratios between the neighboring diffraction patterns.

Retrieval

Removing Blocking Artifacts in Video Streams Using Event Cameras

no code implementations12 May 2021 Henry H. Chopp, Srutarshi Banerjee, Oliver Cossairt, Aggelos K. Katsaggelos

In this paper, we propose EveRestNet, a convolutional neural network designed to remove blocking artifacts in videostreams using events from neuromorphic sensors.

Blocking

Adaptive Illumination based Depth Sensing using Deep Superpixel and Soft Sampling Approximation

1 code implementation23 Mar 2021 Qiqin Dai, Fengqiang Li, Oliver Cossairt, Aggelos K Katsaggelos

The adaptive sparse depth sampling network is jointly trained with a fusion network of an RGB image and sparse depth, to generate optimal adaptive sampling masks.

EXSCLAIM! -- An automated pipeline for the construction of labeled materials imaging datasets from literature

1 code implementation19 Mar 2021 Eric Schwenker, Weixin Jiang, Trevor Spreadbury, Nicola Ferrier, Oliver Cossairt, Maria K. Y. Chan

Due to recent improvements in image resolution and acquisition speed, materials microscopy is experiencing an explosion of published imaging data.

Materials Imaging

E3D: Event-Based 3D Shape Reconstruction

1 code implementation9 Dec 2020 Alexis Baudron, Zihao W. Wang, Oliver Cossairt, Aggelos K. Katsaggelos

We first introduce an event-to-silhouette (E2S) neural network module to transform a stack of event frames to the corresponding silhouettes, with additional neural branches for camera pose regression.

3D Reconstruction 3D Shape Reconstruction

Disassemblable Fieldwork CT Scanner Using a 3D-printed Calibration Phantom

no code implementations12 Nov 2020 Florian Schiffers, Thomas Bochynek, Andre Aichert, Tobias Würfl, Michael Rubenstein, Oliver Cossairt

The use of computed tomography (CT) imaging has become of increasing interest to academic areas outside of the field of medical imaging and industrial inspection, e. g., to biology and cultural heritage research.

Computed Tomography (CT) Tomographic Reconstructions

Semantic Segmentation for Compound figures

no code implementations16 Dec 2019 Weixin Jiang, Eric Schwenker, Maria Chan, Oliver Cossairt

First, a subfigure label detector is built to extract the global layout information of the compound figure.

Information Retrieval Retrieval +2

Uncalibrated Deflectometry with a Mobile Device on Extended Specular Surfaces

no code implementations24 Jul 2019 Florian Willomitzer, Chia-Kai Yeh, Vikas Gupta, William Spies, Florian Schiffers, Marc Walton, Oliver Cossairt

We introduce a system and methods for the three-dimensional measurement of extended specular surfaces with high surface normal variations.

Event-driven Video Frame Synthesis

1 code implementation26 Feb 2019 Zihao W. Wang, Weixin Jiang, Kuan He, Boxin Shi, Aggelos Katsaggelos, Oliver Cossairt

Temporal Video Frame Synthesis (TVFS) aims at synthesizing novel frames at timestamps different from existing frames, which has wide applications in video codec, editing and analysis.

Deblurring Denoising +2

Adaptive Image Sampling using Deep Learning and its Application on X-Ray Fluorescence Image Reconstruction

3 code implementations27 Dec 2018 Qiqin Dai, Henry Chopp, Emeline Pouyet, Oliver Cossairt, Marc Walton, Aggelos K. Katsaggelos

We propose an XRF image inpainting approach to address the issue of long scanning time, thus speeding up the scanning process while still maintaining the possibility to reconstruct a high quality XRF image.

Binarization Image Inpainting +1

Compressive Holographic Video

no code implementations27 Oct 2016 Zihao Wang, Leonidas Spinoulas, Kuan He, Huaijin Chen, Lei Tian, Aggelos K. Katsaggelos, Oliver Cossairt

Compressive holography has been introduced as a method that allows 3D tomographic reconstruction at different depths from a single 2D image.

4D reconstruction Super-Resolution

Toward Long Distance, Sub-diffraction Imaging Using Coherent Camera Arrays

no code implementations28 Oct 2015 Jason Holloway, M. Salman Asif, Manoj Kumar Sharma, Nathan Matsuda, Roarke Horstmeyer, Oliver Cossairt, Ashok Veeraraghavan

Recent advances in ptychography have demonstrated that one can image beyond the diffraction limit of the objective lens in a microscope.

Retrieval Translation

A Framework for the Analysis of Computational Imaging Systems with Practical Applications

no code implementations8 Aug 2013 Kaushik Mitra, Oliver Cossairt, Ashok Veeraraghavan

Unfortunately, a detailed analysis of CI has proven to be a challenging problem because performance depends equally on three components: (1) the optical multiplexing, (2) the noise characteristics of the sensor, and (3) the reconstruction algorithm.

Deblurring

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