Synthetic aperture radar is a well-known technique for improving resolution in radio imaging. Extending these synthetic techniques to the visible light domain not straightforward because optical receivers cannot measure phase information. We propose use macroscopic Fourier ptychography (FP) as practical means of creating imaging achieve subdiffraction-limited resolution. demonstrate first working prototype FP reflection geometry that capable optically rough objects. In addition, novel image...

In this work, we propose using camera arrays coupled with coherent illumination as an effective method of improving spatial resolution in long distance images by a factor often and beyond. Recent advances ptychography have demonstrated that one can image beyond the diffraction limit objective lens microscope. We demonstrate similar imaging system to range imaging. emulate array single attached XY translation stage. show appropriate phase retrieval based reconstruction algorithm be used...

Imaging through scattering media is challenging since the signal to noise ratio (SNR) of reflection can be heavily reduced by scatterers. Single-pixel detectors (SPD) with high sensitivities offer compelling advantages for sensing such weak signals. In this paper, we focus on use ghost imaging resolve 2D spatial information using just an SPD. We prototype a polarimetric system that suppresses backscattering from volumetric and leverages deep learning fast reconstructions. work, implement...

Abstract As x-ray and electron tomography is pushed further into the nanoscale, limitations of rotation stages become more apparent, leading to challenges in alignment acquired projection images. Here we present an approach for rapid post-acquisition these projections obtain high quality three-dimensional Our based on a joint estimation errors, object, using iterative refinement procedure. With simulated data where know error each image, our shows residual that factor thousand smaller, it...

We present a novel computational imaging system with high resolution and low noise. Our consists of traditional video camera which captures high-resolution intensity images, an event encodes high-speed motion as stream asynchronous binary events. To process the hybrid input, we propose unifying framework that first bridges two sensing modalities via noise-robust compensation model, then performs joint image filtering. The filtered output represents temporal gradient captured space-time...

Abstract The presence of a scattering medium in the imaging path between an object and observer is known to severely limit visual acuity system. We present approach circumvent deleterious effects scattering, by exploiting spectral correlations scattered wavefronts. Our Synthetic Wavelength Holography (SWH) method able recover holographic representation hidden targets with sub-mm resolution over nearly hemispheric angular field view. complete recorded within 46 ms, monitoring light return...

Eye-tracking plays a crucial role in the development of virtual reality devices, neuroscience research, and psychology. Despite its significance numerous applications, achieving an accurate, robust, fast eye-tracking solution remains considerable challenge for current state-of-the-art methods. While existing reflection-based techniques (e.g., "glint tracking") are considered to be very their performance is limited by reliance on sparse 3D surface data acquired solely from cornea surface. In...

Holographic displays hold the promise of providing authentic depth cues, resulting in enhanced immersive visual experiences for near-eye applications. However, current holographic are hindered by speckle noise, which limits accurate reproduction color and texture displayed images. We present HoloChrome, a polychromatic display framework designed to mitigate these limitations. HoloChrome utilizes an ultrafast, wavelength-adjustable laser dual-Spatial Light Modulator (SLM) architecture,...

Volumetric 3D displays are frequently purported to lack the ability reconstruct scenes with viewer-position-dependent effects such as occlusion. To counter these claims, a swept-screen 198-view horizontal-parallax-only display is reported here that capable of effects. A digital projector illuminates rotating vertical diffuser series multiperspective 768 x pixel renderings scene. Evidence near-far object occlusion reported. The aggregate virtual screen surface for stationary observer...

We present a prototype compressive video camera that encodes scene movement using translated binary photomask in the optical path. The encoded recording can then be used to reconstruct multiple output frames from each captured image, effectively synthesizing high speed video. use of printed mask allows reconstruction at higher spatial resolutions than has been previously demonstrated. In addition, we improve upon previous work by investigating tradeoffs design and algorithm selection....

Structured light 3D scanning systems are fundamentally constrained by limited sensor bandwidth and source power, hindering their performance in real-world applications where depth information is essential, such as industrial automation, autonomous transportation, robotic surgery, entertainment. We present a novel structured technique called Motion Contrast (MC3D) that maximizes power to avoid trade-offs. The utilizes motion contrast cameras sense temporal gradients asynchronously, i.e.,...

In recent years, many new camera designs have been proposed which preserve image detail over a larger depth range than conventional cameras. These methods rely on either mechanical motion or custom optical element placed in the pupil plane of lens to create desired point spread function (PSF). This work introduces Spectral Focal Sweep (SFS) can be used extend field (DOF) when some information about reflectance spectra objects being imaged is known. Our core idea exploit principle that for...

A number of computational imaging techniques are introduced to improve image quality by increasing light throughput. These use optical coding measure a stronger signal level. However, the performance these is limited decoding step, which amplifies noise. Although it well understood that can increase at low levels, little known about quantitative advantage in general settings. In this paper, we derive bounds for various techniques. We then discuss implications several real-world scenarios...

Fourier ptychography is an imaging technique that overcomes the diffraction limit of conventional cameras with applications in microscopy and long range imaging. Diffraction blur causes resolution loss both cases. In ptychography, a coherent light source illuminates object, which then imaged from multiple viewpoints. The reconstruction object these set recordings can be obtained by iterative phase retrieval algorithm. However, process slow does not work well under certain conditions. this...

A transmission matrix describes the input-output relationship of a complex wavefront as it passes through/reflects off multiple-scattering medium, such frosted glass or painted wall. Knowing medium's enables one to image through send signals even use medium lens. The double phase retrieval method is recently proposed technique learn that avoids difficult-to-capture interferometric measurements. Unfortunately, perform high resolution imaging, existing methods require (1) large number...

Can we reconstruct the entire internal shape of a room if all can directly observe is small portion one wall, presumably through window in room? While conventional wisdom may indicate that this not possible, motivated by recent work on `looking around corners', show exploit light echoes to hidden rooms. Existing techniques for looking corner using transient images model volume voxels and try explain captured response as sum responses obtained from individual voxels. Such technique inherently...

In recent years, several cameras have been introduced which extend depth of field (DOF) by producing a depth-invariant point spread function (PSF). These DOF deblurring captured image with single spatially-invariant PSF. For these cameras, the quality recovered images depends both on magnitude PSF spectrum (MTF) camera, and similarity between PSFs at different depths. While researchers compared MTFs extended relatively little attention has paid to evaluating their invariances. this paper, we...

Three-dimensional imaging using Time-of-flight (ToF) sensors is rapidly gaining widespread adoption in many applications due to their cost effectiveness, simplicity, and compact size. However, the current generation of ToF cameras suffers from low spatial resolution physical fabrication limitations. In this paper, we propose CS-ToF, an architecture achieve high via optical multiplexing compressive sensing. Our approach based on observation that, while depth non-linearly related pixel...

Abstract Visible hyperspectral imaging (HSI) is a fast and non-invasive method that has been adapted by the field of conservation science to study painted surfaces. By collecting reflectance spectra from 2D surface, resulting 3D data cube contains millions recorded spectra. While processing such large amounts poses an analytical computational challenge, it also opens new opportunities apply powerful methods multivariate analysis for evaluation. With intent expanding current treatment...

Temporal Video Frame Synthesis (TVFS) aims at synthesizing novel frames timestamps different from existing frames, which has wide applications in video codec, editing and analysis. In this paper, we propose a high frame-rate TVFS framework takes hybrid input data low-speed frame-based sensor high-speed event-based sensor. Compared to sensors, sensors report brightness changes very speed, may well provide useful spatio-temoral information for TVFS. Therefore, first introduce differentiable...

Holographic displays promise to deliver unprecedented display capabilities in augmented reality applications, featuring a wide field of view, color gamut, spatial resolution, and depth cues all compact form factor. While emerging holographic approaches have been successful achieving large étendue high image quality as seen by camera, the also reveals problem that makes existing impractical: sampling eye pupil. Existing methods not investigated this issue due lack with enough étendue, and,...

We present a novel image-based method for compositing real and synthetic objects in the same scene with high degree of visual realism. Ours is first technique to allow global illumination near-field lighting effects between both at interactive rates, without needing geometric material model scene. achieve this by using light field interface components---thus, indirect can be simulated only two 4D fields, one captured from projected onto Multiple bounces interreflections are obtained simply...

The resolution of a camera system determines the fidelity visual features in captured images. Higher implies greater and, thus, accuracy when performing automated vision tasks, such as object detection, recognition, and tracking. However, any is fundamentally limited by geometric aberrations. In past, it has generally been accepted that lenses with aberrations cannot be increased beyond certain threshold. We derive an analytic scaling law showing that, for spherical aberrations, can...