Search results for "Graphics"
showing 10 items of 1223 documents
Computation of microimages for plenoptic display
2014
We report a new algorithm for the generation of the microimages ready for their projection into an integral imaging monitor. The algorithm is based in the transformation properties of the plenoptic field captured with an array of digital cameras. We show that a small number of cameras can produce the microimages for displaying 3D scenes with resolution and parallax fully adapted to the monitor features.
Full-parallax 3D display from the hole-filtered depth information
2015
In this paper we introduce an efficient hole-filling algorithm for synthetic generation of microimages that are displayed on an integral imaging monitor. We apply the joint bilateral filter and the median filter to the captured depth map. We introduce in any step of the iterative algorithm with the data from a new Kinect capture. As a result, this algorithm can improve the quality of the depth maps and remove unmeasured depth holes effectively. This refined depth information enables to create a tidy integral image, which can be projected into an integral imaging monitor. In this way the monitor can display 3D images with continuous views, full parallax and abundant 3D reconstructed scene fo…
Three-dimensional imaging system with both improved lateral resolution and depth of field considering non-uniform system parameters
2018
In this paper, we propose a new 3D passive image sensing and visualization technique to improve lateral resolution and depth of field (DoF) of integral imaging simultaneously. There is a resolution trade-off between lateral resolution and DoF in integral imaging. To overcome this issue, a large aperture and a small aperture can be used to record the elemental images to reduce the diffraction effect and extend the DoF, respectively. Therefore, in this paper, we utilize these two pickup concepts with a non-uniform camera array. To show the feasibility of our proposed method, we implement an optical experiment. For comparison in details, we calculate the peak signal-to-noise ratio (PSNR) as th…
Depth rendering of large incoherent scenes from integral images
2016
Integral imaging is a technique that provides the spatial and angular information of three-dimensional (3D) scenes through a single shot. Taking advantage of this capability, different applications have been developed. Some of these applications are the 3D display and digital post-processing, in particular depth-reconstruction from integral images.
Télécollaboration asymétrique en réalité virtuelle
2016
National audience; Nous présentons une première étude de combinaison de deux systèmes asymétriques de réalité virtuelle dans un contexte de travail collaboratif : un système de type CAVE et un casque immersif. L’architecture, de type serveur-client, permet une collaboration entre plusieurs utilisateurs. Les expériences sur une tâche de construction de puzzles en un temps limité, seul et en collaboration, montrent que l’utilisation combinée de systèmes asymétriques CAVE et casques permet d’améliorer les performances des utilisateurs. Par ailleurs les utilisateurs préfèrent le travail en collaboration et sont plus efficaces ensemble. Ces résultats ouvrent des perspectives intéressantes de com…
Acoustic rendering of particle-based simulation of liquids in motion
2009
In interaction and interface design, the representation of continuous processes often uses liquid metaphors, such as dripping or streaming. When an auditory display of such processes is required, an approach to sound-synthesis based on the physics of liquids in motion would be the most convincing, especially when real-time interaction is into play. In order to bridge the complexity of fluid-dynamic simulations with the needs of interactive sonification, we propose a multi-rate sound synthesis of liquid phenomena. Low-rate smoothed-particle hydrodynamics is used to model liquids in motion and to trigger sound-emitting events. Such events, such as solid-liquid collision, or bubble formation, …
AnyDSL: a partial evaluation framework for programming high-performance libraries
2023
This paper advocates programming high-performance code using partial evaluation. We present a clean-slate programming system with a simple, annotation-based, online partial evaluator that operates on a CPS-style intermediate representation. Our system exposes code generation for accelerators (vectorization/parallelization for CPUs and GPUs) via compiler-known higher-order functions that can be subjected to partial evaluation. This way, generic implementations can be instantiated with target-specific code at compile time. In our experimental evaluation we present three extensive case studies from image processing, ray tracing, and genome sequence alignment. We demonstrate that using partial …
Sposoby vyraženiâ čuvstv i èmocij v Internet-obŝenii
2017
Język komunikacji w Internecie zbliżony jest do języka potocznego i charakteryzuje się dużą emocjonalnością. Internauci ośmieleni anonimowością w Sieci chętnie dzielą się swoimi uczuciami, wzburzeniem, zachwytem, radością i gniewem z innymi użytkownikami. Jak wiadomo, w odbiorze informacji najważniejszą rolę gra mimika oraz ton głosu. W komunikacji internetowej brak jest tak ważnego kanału wizualnego, więc internauci zmuszeni są przekazywać emocje innymi sposobami. Najczęściej wykorzystywane są przez nich znaki graficzne, czyli emotikony. Innymi często stosowanymi zabiegami są: zwielokrotnienie znaków interpunkcyjnych i liter, skandowanie (tj. dzielenie wyrazu na sylaby) oraz akcent frazowy…
What characterizes Norwegian nursing students’ reflective journals during clinical placement in an African country?
2015
Abstract Introduction An increasing number of Norwegian nursing students take part in exchange programmes in African countries. Reflective journals are often used to enhance clinical placements learning outcomes. Aim To identify the features that characterized students' experiences reported in their reflective journals during clinical placements in an African country in light of cultural competence. Methods Qualitative text analysis of 350 reflective journals written by 197 students taking part in an exchange programme in one of three African countries. Results The reflective journals were characterized by the students' personal emotions, judgements of others and comparisons between what th…
Three-dimensional atomic force microscopy mapping at the solid-liquid interface with fast and flexible data acquisition
2016
We present the implementation of a three-dimensional mapping routine for probing solid-liquid interfaces using frequency modulation atomic force microscopy. Our implementation enables fast and flexible data acquisition of up to 20 channels simultaneously. The acquired data can be directly synchronized with commercial atomic force microscope controllers, making our routine easily extendable for related techniques that require additional data channels, e.g., Kelvin probe force microscopy. Moreover, the closest approach of the tip to the sample is limited by a user-defined threshold, providing the possibility to prevent potential damage to the tip. The performance of our setup is demonstrated …