14 citations · 49 across the 19 of their papers we have counts for
21 papers
Intensity-Correlation Synthetic Wavelength Imaging in Dynamic Scattering Media
Khaled Kassem, Areeba Fatima, Patrick Cornwall +3
Imaging through dynamic scattering media, such as biological tissue, presents a fundamental challenge due to light scattering and the formation of speckle patterns. These patterns…
Fast 360-Degree 3D Metrology for Directed Energy Deposition
James Taylor, Jiazhang Wang, Guanzhong Hu +5
Directed Energy Deposition (DED) is a metal additive manufacturing process capable of building and repairing large, complex metal parts from a wide range of alloys. Its flexibility…
Fiber Endoscopy Using Synthetic Wavelengths for 3D tissue imaging
Muralidhar Madabhushi Balaji, Partrick Cornwall, Parker Liu +3
Fiber-based endoscopes utilizing multi-core fiber (MCF) bundles offer the capability to image deep within the human body, making them well-suited for imaging applications in minima…
Review and Novel Formulae for Transmittance and Reflectance of Wedged Thin Films on absorbing Substrates
Manuel Ballester, Emilio Marquez, John Bass +3
Historically, spectroscopic techniques have been essential for studying the optical properties of thin solid films. However, existing formulae for both normal transmission and refl…
An Angular Spectrum Approach to Inverse Synthesis for the Characterization of Optical and Geometrical Properties of Semiconductor Thin Films
John M. Bass, Manuel Ballester, Susana M. Fernández +3
To design semiconductor-based optical devices, the optical properties of the used semiconductor materials must be precisely measured over a large band. Transmission spectroscopy st…
Synthetic Light-in-Flight
Patrick Cornwall, Manuel Ballester, Stefan Forschner +3
Light-in-flight (LiF) measurements enable the visualization of light paths through arbitrary, volumetric scenes, making light-matter interactions at ultrafast timescales visible. T…
3D Imaging of Complex Specular Surfaces by Fusing Polarimetric and Deflectometric Information
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. Frequently used methods, such as phase-measuring…
Event-based Motion-Robust Accurate Shape Estimation for Mixed Reflectance Scenes
Aniket Dashpute, Jiazhang Wang, James Taylor +3
Event-based structured light systems have recently been introduced as an exciting alternative to conventional frame-based triangulation systems for the 3D measurements of diffuse s…
Accurate Eye Tracking from Dense 3D Surface Reconstructions using Single-Shot Deflectometry
Jiazhang Wang, Tianfu Wang, Bingjie Xu +2
Eye-tracking plays a crucial role in the development of virtual reality devices, neuroscience research, and psychology. Despite its significance in numerous applications, achieving…
Accurate and Fast VR Eye-Tracking using Deflectometric Information
Jiazhang Wang, Tianfu Wang, Bingjie Xu +2
We present two methods for fast and precise eye-tracking in VR headsets. Both methods exploit deflectometric information, i.e., the specular reflection of an extended screen over t…
Thermal Spread Functions (TSF): Physics-guided Material Classification
Aniket Dashpute, Vishwanath Saragadam, Emma Alexander +4
Robust and non-destructive material classification is a challenging but crucial first-step in numerous vision applications. We propose a physics-guided material classification fram…
Optimization-Based Eye Tracking using Deflectometric Information
Tianfu Wang, Jiazhang Wang, Oliver Cossairt +1
Eye tracking is an important tool with a wide range of applications in Virtual, Augmented, and Mixed Reality (VR/AR/MR) technologies. State-of-the-art eye tracking methods are eith…
Single-shot ToF sensing with sub-mm precision using conventional CMOS sensors
Manuel Ballester, Heming Wang, Jiren Li +2
We present a novel single-shot interferometric ToF camera targeted for precise 3D measurements of dynamic objects. The camera concept is based on Synthetic Wavelength Interferometr…
Synthetic Wavelength Imaging -- Utilizing Spectral Correlations for High-Precision Time-of-Flight Sensing
Florian Willomitzer
This book chapter describes how spectral correlations in scattered light fields can be utilized for high-precision time-of-flight sensing. The chapter should serve as a gentle intr…
Can Deep Learning Assist Automatic Identification of Layered Pigments From XRF Data?
Bingjie, Xu, Yunan Wu +12
X-ray fluorescence spectroscopy (XRF) plays an important role for elemental analysis in a wide range of scientific fields, especially in cultural heritage. XRF imaging, which uses…
Characterizing the Immaterial. Noninvasive Imaging and Analysis of Stephen Benton's Hologram Engine no. 9
Marc Walton, Pengxiao Hao, Marc Vermeulen +2
Invented in 1962, holography is a unique merging of art and technology. It persisted at the scientific cutting edge through the 1990s, when digital imaging emerged and supplanted f…
SkinScan: Low-Cost 3D-Scanning for Dermatologic Diagnosis and Documentation
Merlin A. Nau, Florian Schiffers, Yunhao Li +7
The utilization of computational photography becomes increasingly essential in the medical field. Today, imaging techniques for dermatology range from two-dimensional (2D) color im…
Exploiting wavelength diversity for high resolution time-of-flight 3D imaging
Fengqiang Li, Florian Willomitzer, Prasanna Rangarajan +1
State-of-the-art time-of-flight (ToF) based 3D sensors suffer from poor lateral and depth resolutions. In this work, we introduce a novel sensor concept that provides ToF-based 3D…
Intensity interferometry-based 3D imaging
Fabian Wagner, Florian Schiffers, Florian Willomitzer +2
The development of single-photon counting detectors and arrays has made tremendous steps in recent years, not the least because of various new applications in, e.g., LIDAR devices.…
Synthetic Wavelength Holography: An Extension of Gabor's Holographic Principle to Imaging with Scattered Wavefronts
Florian Willomitzer, Prasanna V. Rangarajan, Fengqiang Li +3
The presence of a scattering medium in the imaging path between an object and an observer is known to severely limit the visual acuity of the imaging system. We present an approach…
Uncalibrated Deflectometry with a Mobile Device on Extended Specular Surfaces
Florian Willomitzer, Chia-Kai Yeh, Vikas Gupta +4
We introduce a system and methods for the three-dimensional measurement of extended specular surfaces with high surface normal variations. Our system consists only of a mobile hand…