Cultural heritage artifacts often contain details that are difficult to distinguish due aging effects such as erosion. We propose the revealing flashlight , a new interaction and visualization technique in spatial augmented reality helps reveal detail of artifacts. locally interactively augment physical artifact by projecting an expressive 3D highlights its features, based on analysis previously acquired geometry at multiple scales. Our novel simulates improves behavior flashlight: according...

We present a novel technique called Radiance Scaling for the depiction of surface shape through shading. It adjusts reflected light intensities in way dependent on both curvature and material characteristics. As result, diffuse shading or highlight variations become correlated to feature variations, enhancing concavities convexities. This approach is more versatile compared previous methods. First, it produces satisfying results with any kind material: we demonstrate obtained Phong Ashikmin...

Recent research on the human visual system shows that our perception of object shape relies in part compression and stretching reflected lighting environment onto its surface. We use this property to enhance depiction 3D objects by locally warping around main surface features. Contrary previous work, which require specific illumination, material characteristics and/or stylization choices, approach enhances without impairing desired appearance. Thanks novel local descriptor, salient features...

In augmented reality, one of key tasks to achieve a convincing visual appearance consistency between virtual objects and video scenes is have coherent illumination along the whole sequence. As outdoor largely dependent on weather, lighting condition may change from frame frame. this paper, we propose full image-based approach for online tracking variations videos captured with moving cameras. Our idea estimate relative intensities sunlight skylight via sparse set planar feature-points...

Over the last two decades, much effort has been devoted to accurately measuring Bidirectional Reflectance Distribution Functions (BRDFs) of real-world materials and use efficiently resulting data for rendering. Because their large size, it is difficult directly measured BRDFs real-time applications, fitting most sophisticated analytical BRDF models still a complex task. In this paper, we introduce Rational BRDF, general-purpose efficient representation arbitrary BRDFs, based on (RFs). Using...

Realistic image synthesis requires both complex and realistic models of real-world light sources efficient rendering algorithms to deal with them. In this paper, we describe a processing pipeline for dealing from acquisition global illumination rendering. We carefully design optical filters guarantee high precision measurements sources. discuss two practically feasible setups that allow us measure different characteristics. Finally, introduce an importance sampling algorithm our...

Abstract We introduce a new approach for defining continuous non‐oriented gradient fields from discrete inputs, fundamental stage variety of computer graphics applications such as surface or curve reconstruction, and image stylization. Our builds on moving least square formalism that computes higher‐order local approximations input gradients. In particular, we show our novel isotropic linear approximation outperforms its lower‐order alternative: structures are much better preserved,...

Abstract Many algorithms in computer graphics improve their efficiency by using Hierarchical Space Subdivision Schemes (HS 3 ), such as octrees, kD‐trees or BSP trees. Such HS usually provide an axis‐aligned subdivision of the 3D space embedding a scene object. However, purely volume‐based behavior these schemes often leads to strongly imbalanced surface clustering. In this article, we introduce VS‐Tree, alternative providing efficient and accurate surface‐based hierarchical clustering via...

The ability to perform interactive walkthroughs of global illumination solutions including glossy effects is a challenging open problem. In this paper we overcome certain limitations previous approaches. We first introduce novel, memory‐ and compute‐efficient representation incoming illumination, in the context hierarchical radiance clustering algorithm. then represent outgoing with an adaptive basis, manner suitable for display. Using appropriate refinement display strategies, achieve at...

Shape depiction in non-photorealistic rendering of 3D objects has mainly been concerned with the extraction contour lines, which are generally detected by tracking discontinuities a given set shape features varying on surface and/or picture plane. In this paper, we investigate another approach: through shading. This technique is often used scientific illustration, comics, cartoon animation and various other artwork. A common method consists indirectly adapting light positions to reveal...

We introduce an on-line framework for the visualizing of underground structures that improves X-Ray vision and Focus Context Rendering Augmented Reality. Our approach does not require accurate reconstruction 3D environment runs on modern hardwares. For these purposes, we extract characteristic features from video frames create visual cues to reveal occlusion relationships. To enhance perception occluding order, extracted are either directly rendered, or used hybrid blending masks: thus...

Abstract This paper introduces a system for the direct editing of highlights produced by anisotropic BRDFs, which we call highlights. We first provide comprehensive analysis link between direction anisotropy and shape highlight curves arbitrary object surfaces. The gained insights required ingredients to infer BRDF orientations from prescribed tangent field. amounts non‐linear optimization problem, is solved at interactive framerates during manipulation. Taking inspiration sculpting...

This paper discusses the use of a small ultraportable hyperspectral camera in VIS-NIR (Visible-Near Infrared) range for archaeological fieldwork and its hardware, data processing workflows, spectral information that can be used situ screening. Hyperspectral imaging is widespread, non-destructive analytical technique various disciplines highlighting invisible patterns mapping signatures selected targets. In archaeology, it has mostly been applied remote sensing satellite imagery to uncover...

For the generation of freeform models, sketching interfaces have raised an increasing interest due to their intuitive approach. It is now possible infer a 3D model directly from sketched curved. Unfortunately, limit current systems poor quality skeleton automatically extracted this silhouette, leading low meshes for resulting objects.In paper, we present new solutions that improve surface sketch-based modeling systems. First, propose algorithm extracts smoother compared previous approaches....

We present a novel method for producing convincing pictures of shaded objects based entirely on 2D image operations. This approach, which we call image-based shading design , offers direct artistic control in the picture plane by deforming primitives so that they appear to conform specific 3D shapes. Using differential analysis reflected radiance, identify two types surface flows involved depiction objects, are consistent with recent perceptual studies. then introduce deformation operators...

Abstract Monte Carlo Techniques are widely used in Computer Graphics to generate realistic images. Multiple Importance Sampling reduces the impact of choosing a dedicated strategy by balancing number samples between different strategies. However, an automatic choice optimal remains difficult problem. Without any scene characteristics knowledge, default is select same from strategies and use them with heuristic techniques (e.g., balance, power or maximum). In this paper, we introduce...

We present an integrated global illumination algorithm including non-diffuse light transport which can handle complex scenes and enables rapid incremental updates. build on a unified uses hierarchical radiosity with clustering particle tracing for diffuse respectively. new chooses between reconstructing specular effects such as caustics the mesh, or special purpose caustic textures, when high frequencies are present. Algorithms presented to choose resolution of these textures reconstruct...

Realistic image synthesis requires both complex and realistic models of real-world light sources efficient rendering algorithms to deal with them. In this paper, we describe a processing pipeline for dealing from acquisition global illumination rendering. We carefully design optical filters guarantee high precision measurements sources. discuss two practically feasible setups that allow us measure different characteristics. Finally, introduce an importance sampling algorithm our...

In this paper, we present a new approach for remote visualization of large 3D cities. Our is based on expressive rendering (also known as Non-Photorealistic Rendering), and more precisely, feature lines. By focusing characteristic features, solution brings legible reduces the amount data transmitted network. We also introduce client-server system rendering, well involved pre-processing stage that required optimization. Based presented system, perform study usability such an in context mobile devices.

Based on the observation that shading conveys shape information through intensity gradients, we present a new technique called Radiance Scaling modifies classical equations to offer versatile depiction functionalities. It works by scaling reflected light intensities depending both surface curvature and material characteristics. As result, diffuse or highlight variations become correlated with feature variations, enhancing concavities convexities. The first advantage of such an approach is it...

Abstract We introduce a new technique called Implicit Brushes to render animated 3D scenes with stylized lines in realtime temporal coherence. An Brush is defined at given pixel by the convolution of brush footprint along feature skeleton; skeleton itself obtained locating surface features neighborhood. Features are identified via image‐space fitting techniques that not only extract their location, but also profile, which permits distinguish between sharp and smooth features. Profile...