Light field imaging has emerged as a technology allowing to capture richer visual information from our world. As opposed traditional photography, which captures 2D projection of the light in scene integrating angular domain, fields collect radiance rays all directions, demultiplexing lost conventional photography. On one hand, this higher dimensional representation data offers powerful capabilities for understanding, and substantially improves performance computer vision problems such depth...

We present femto-photography , a novel imaging technique to capture and visualize the propagation of light. With an effective exposure time 1.85 picoseconds (ps) per frame, we reconstruct movies ultrafast events at equivalent resolution about one half trillion frames second. Because cameras with this shutter speed do not exist, re-purpose modern hardware record ensemble average repeatable that are synchronized streak sensor, in which arrival light from scene is coded sensor's spatial...

Recent advances in ultra-fast imaging have triggered many promising applications graphics and vision, such as capturing transparent objects, estimating hidden geometry materials, or visualizing light motion. There is, however, very little work regarding the effective simulation analysis of transient transport, where speed can no longer be considered infinite. We first introduce path integral framework, formally describing transport state. then analyze difficulties arising when considering...

Time-of-flight (ToF) imaging has become a widespread technique for depth estimation, allowing affordable off-the-shelf cameras to provide maps in real time. However, multipath interference (MPI) resulting from indirect illumination significantly degrades the captured depth. Most previous works have tried solve this problem by means of complex hardware modifications or costly computations. In work, we avoid these approaches and propose new correct errors caused MPI, which requires no camera...

Recent works have demonstrated non-line of sight (NLOS) reconstruction by using the time-resolved signal from multiply scattered light. These combine ultrafast imaging systems with computation, which back-projects recorded space-time to build a probabilistic map hidden geometry. Unfortunately, this computation is slow, becoming bottleneck as technology improves. In work, we propose new back-projection technique for NLOS reconstruction, up thousand times faster than previous almost no quality...

Virtual characters contribute strongly to the entire visuals of 3D animated films. However, designing believable remains a challenging task. Artists rely on stylization increase appeal or expressivity, exaggerating softening specific features. In this paper we analyze two most influential factors that define how character looks: shape and material. With help artists, design set carefully crafted stimuli consisting different levels for both parameters, combinations affect perceived realism,...

Transient imaging has recently made a huge impact in the computer graphics and vision fields. By capturing, reconstructing, or simulating light transport at extreme temporal resolutions, researchers have proposed novel techniques to show movies of motion, see around corners, detect objects highly-scattering media, infer material properties from distance, name few. The key idea is leverage wealth information domain pico nanosecond resolution, usually lost during capture-time integration. This...

We present a thorough study to evaluate different light field editing interfaces, tools and workflows from user perspective. This is of special relevance given the multidimensional nature fields, which may make common image tasks become complex in space. additionally investigate potential benefits using depth information when editing, limitations imposed by imperfect reconstruction current techniques. perform two experiments, collecting both objective subjective data varied number increasing...

Abstract This paper presents a time‐varying, multi‐layered biophysically‐based model of the optical properties human skin, suitable for simulating appearance changes due to aging. We have identified key aspects that cause such changes, both in terms structure skin and its chromophore concentrations, rely on extensive medical tissue literature accurate data. Our can be expressed biophysical parameters, parameters commonly used graphics rendering (such as spectral absorption scattering...

Microfacet theory concisely models light transport over rough surfaces. Specular reflection is the result of single mirror reflections on each facet, while exact computation multiple scattering either neglected, or modeled using costly importance sampling techniques. Practical but accurate simulation in microfacet thus remains an open challenge. In this work, we revisit traditional V-groove cavity model and derive analytical, cost-effective solution for Our kaleidoscopic made up both real...

Efficient scene representations are essential for many computer graphics applications. A general unified representation that can handle both surfaces and volumes simultaneously remains a research challenge. In this work we propose compact efficient alternative to existing volumetric rendering such as voxel grids. Inspired by recent methods reconstruction leverage mixtures of three-dimensional Gaussians model radiance fields, formalize generalize the modeling scattering emissive media using...

The unique and visually mesmerizing appearance of pearlescent materials has made them an indispensable ingredient in a diverse array applications including packaging, ceramics, printing, cosmetics. In contrast to their natural counterparts, such synthetic examples pearlescence are created by dispersing microscopic interference pigments within dielectric resin. resulting space comprises enormous range different phenomena ranging from smooth lustrous reminiscent pearl highly directional...

In this paper, we propose two real‐time models for simulating subsurface scattering a large variety of translucent materials, which need under 0.5 ms per frame to execute. This makes them practical option production scenarios. Current state‐of‐the‐art, approaches simulate light transport by approximating the radially symmetric non‐separable diffusion kernel with sum separable Gaussians, requires multiple (up 12) 1D convolutions. work relax requirement radial symmetry approximate 2D diffuse...

We introduce a non-exponential radiative framework that takes into account the local spatial correlation of scattering particles in medium. Most previous works graphics have ignored this, assuming uncorrelated media with uniform, random distribution particles. However, positive and negative lead to slower- faster-than-exponential attenuation respectively, which cannot be predicted by Beer-Lambert law. As our results show, this has major effect on extinction, thus appearance. From recent...

We propose a surface-based cloth shading model that generates realistic appearance with ply-level details. It generalizes previous models to broader set of including knitted and thin woven cloth. Our takes into account the most dominant visual features cloth, anisotropic S-shaped reflection highlight, cross-shaped transmission highlights, delta transmission, shadowing masking. these elements via comprehensive micro-scale BSDF meso-scale effective formulation. Then, we an implementation...

Abstract Accurately modeling how light interacts with cloth is challenging, due to the volumetric nature of appearance and its multiscale structure, where microstructures play a major role in overall at higher scales. Recently, significant effort has been put on developing better microscopic models for which have allowed rendering fabrics unprecedented fidelity. However, these highly‐detailed representations still make severe simplifications scattering by individual fibers forming cloth,...

The BTF data structure was a breakthrough for appearance modeling in computer graphics. More research is needed though to make BTFs practical rendering applications. We present the first systematic study of effects Approximate filtering on BTFs, by exploring spatial, angular and temporal domains over varied set stimuli. perform our initial experiments simple geometry lighting, verify observations more complex settings. consider multi-dimensional versus conventional mipmapping, find that...

Time-resolved imaging has made it possible to look around corners by exploiting information from diffuse light bounces. While there have been successive improvements in the field since its conception, so far only proven work very simple and controlled scenarios. We present a public dataset of synthetic time-resolved Non-Line-of-Sight (NLOS) scenes with varied complexity aimed at benchmarking reconstructions. It includes that are common real world but remain challenge for NLOS reconstruction...

Non-line-of-sight (NLOS) imaging aims to reconstruct partially or completely occluded scenes. Recent approaches have demonstrated high-quality reconstructions of complex scenes with arbitrary reflectance, occlusions, and significant multi-path effects. However, previous works focused on surface scattering only, which reduces the generality in more challenging scenarios such as submerged media. In this work, we investigate current state-of-the-art NLOS methods based phasor fields We...

Abstract On the foundations of many rendering algorithms it is symmetry between path traversed by light and its adjoint starting from camera. However, several effects, including polarization or fluorescence, break that symmetry, are defined only on direction propagation. This reduces applicability bidirectional methods exploit this for simulating effectively transport. In work, we focus how to include these non‐symmetric effects within a algorithm. We generalize integral support constraints...

Introducing polarization into transient imaging improves depth estimation in participating media, by discriminating reflective from scattered light transport and calculating the former component only. Previous works have leveraged this approach under assumption of uniform properties. However, orientation intensity inside scattering media is nonuniform, both spatial temporal domains. As a result simplifying assumption, accuracy estimated worsens significantly as optical thickness medium...

Recent works have demonstrated non-line of sight (NLOS) reconstruction by using the time-resolved signal from multiply scattered light. These combine ultrafast imaging systems with computation, which back-projects recorded space-time to build a probabilistic map hidden geometry. Unfortunately, this computation is slow, becoming bottleneck as technology improves. In work, we propose new back-projection technique for NLOS reconstruction, up thousand times faster than previous negligible quality loss.

We present a novel imaging technique, which we call femto-photography , to capture and visualize the propagation of light through table-top scenes with an effective exposure time 1.85 ps per frame. This is equivalent resolution about one half trillion frames second; between frames, travels approximately just 0.5 mm. Since cameras such extreme shutter speed obviously do not exist, first re-purpose modern hardware record ensemble average repeatable events that are synchronized streak sensor,...