Encontrados 39 documentos, a visualizar página 1 de 4
Improving FEM crash simulation accuracy through local thickness estimation base...
Ferreira, Vânio; Santos, Luís Paulo; Franzen, Markus; Ghouati, Omar; Simões, RicardoManuscript ; In this paper, we present a method for estimating local thickness distribution in finite element models, applied to injection molded and cast engineering parts. This method features considerable improved performance compared to two previously proposed approaches, and has been validated against thickness measured by different human operators. We also demonstrate that the use of this method for assi...
Efficient generic face model fitting to images and videos
Unzueta, Luis; Pimenta, Waldir; Goenetxea, Jon; Santos, Luís Paulo; Dornaika, FadiIn this paper we present a robust and lightweight method for the automatic fitting of deformable 3D face models on facial images. Popular fitting techniques such as those based on statistical models of shape and appearance require a training stage based on a set of facial images and their corresponding facial landmarks, which have to be manually labeled. Therefore, new images in which to fit the model cannot di...
Guest editorial : high dynamic range imaging
Santos, Luís Paulo; Debattista, KurtHigh Dynamic Range (HDR) imagery is a step-change in imaging technology that is not limited to the 8-bits per pixel for each color channel that traditional or low-dynamic range digital images have been constrained to. These restrictions have meant that the current and relatively novel imaging technologies including stereoscopic, HD and ultraHD imaging do not provide an accurate representation of the lighting av...
Interactive high fidelity visualization of complex materials on the GPU
Silva, Nuno Alexandre Campos Pereira da; Santos, Luís PauloDocumento submetido para revisão pelos pares. A publicar em Computers & Graphics. ISSN 0097-8493. 37:7 (nov. 2013) p. 809–819 ; High fidelity interactive rendering is of major importance for footwear designers, since it allows experimenting with virtual prototypes of new products, rather than producing expensive physical mock-ups. This requires capturing the appearance of complex materials by resorting to imag...
Spherical Fibonacci point sets for illumination integrals
Marques, Ricardo; Bouville, Christian; Ribardiére, Michael; Santos, Luís Paulo; Bouatouch, KadiArticle first published online: 24 JUL 2013 ; Quasi-Monte Carlo (QMC) methods exhibit a faster convergence rate than that of classic Monte Carlo methods. This feature has made QMC prevalent in image synthesis, where it is frequently used for approximating the value of spherical integrals (e.g. illumination integral). The common approach for generating QMC sampling patterns for spherical integration is to resor...
Bespoke high-fidelity visualization of tiling
Santos, Luís Paulo; Wood, Jonathan; Selmanovic, Elmedin; Harvey, Carlo; Debattista, Kurt; Chalmers, AlanThis paper describes the development and validation of a new service allowing products, such as tiles, to be viewed on a computer authentically in the actual lighting conditions of the area in which they are to be installed. This service leverages recent developments in physically based global illumination and High Dynamic Range (HDR) imaging, enabling real-world lighting to be accurately captured, transferred ...
clOpenCL : supporting distributed heterogeneous computing in HPC clusters
Alves, Albano Agostinho Gomes; Rufino, José; Pina, António Manuel Silva; Santos, Luís PauloClusters that combine heterogeneous compute device architectures, coupled with novel programming models, have created a true alternative to traditional (homogeneous) cluster computing, allowing to leverage the performance of parallel applications. In this paper we introduce clOpenCL, a platform that supports the simple deployment and efficient running of OpenCL-based parallel applications that may span several ...
clOpenCL - supporting distributed heterogeneous computing in HPC clusters
Alves, Albano; Rufino, José; Pina, António; Santos, Luis PauloClusters that combine heterogeneous compute device architectures, coupled with novel programming models, have created a true alternative to traditional (homogeneous) cluster computing, allowing to leverage the performance of parallel applications. In this paper we introduce clOpenCL, a platform that supports the simple deployment and efficient running of OpenCL-based parallel applications that may span several ...
Editorial : Computers & Graphics journal special section on cultural heritage
Chalmers, Alan; Mudge, Mark; Santos, Luís PauloEditorial special section ; An increasing number of Cultural Heritage professionals are using Computer Graphics technology to unlock and document the secrets of humanity's legacy. Earlier this year, a recent special issue of this journal published some of the important results from the intersection of these two fields [1]. The level of interest and the quality of submissions was such that an additional special...
A (ir)regularity-aware task scheduler for heterogeneous platforms
Mariano, Artur; Alves, Ricardo; Barbosa, João; Santos, Luís Paulo; Proença, Alberto JoséThis paper addresses the design, implementation and validation of an e ective scheduling scheme for both regular and irregular applications on heterogeneous platforms. The scheduler uses an empirical performance model to dynamically schedule the workload, organized into a given number of chunks, and follows the Heterogeneous Earliest Finish Time (HEFT) scheduling algorithm, which ranks the tasks based on both t...
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