Downsampling and Storage of Pre-Computed Gradients for Volume Rendering (Unknown language)

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The way in which gradients are computed in volume datasets influences both the quality of the shading and the performance obtained in rendering algorithms. In particular, the visualization of coarse datasets in multi-resolution representations is affected when gradients are evaluated on-the-fly in the shader code by accessing neighbouring positions. This is not only a costly computation that compromises the performance of the visualization process, but also one that provides gradients of low quality that do not resemble the originals as much as desired because of the new topology of downsampled datasets. An obvious solution is to pre-compute the gradients and store them. Unfortunately, this originates two problems: First, the downsampling process, that is also prone to generate artifacts. Second, the limited bit size of storage itself causes the gradients to loss precision. In order to solve these issues, we propose a downsampling filter for pre-computed gradients that provides improved gradients that better match the originals such that the aforementioned artifacts disappear. Secondly, to address the storage problem, we present a method for the efficient storage of gradient directions that is able to minimize the minimum angle achieved among all representable vectors in a space of 3 bytes. We also provide several examples that show the advantages of the proposed approaches.

Table of contents conference proceedings

The tables of contents are generated automatically and are based on the data records of the individual contributions available in the index of the TIB portal. The display of the Tables of Contents may therefore be incomplete.

1
An Improved Parallel Technique for Neighbour Search on CUDA
Perea, Juan J. / Cordero, Juan M. | 2017
11
Dissipation Potentials for Yarn-Level Cloth
Sánchez-Banderas, Rosa M. / Otaduy, Miguel A. | 2017
19
Physically Based Skeleton Tracking
López-Gandía, Axel / Susín, Antonio | 2017
23
Extending Industrial Digital Twins with Optical Object Tracking
Tammaro, Antonio / Segura, Álvaro / Moreno, Aitor / Sánchez, Jairo R. | 2017
27
Unsupervised Framework for People Counting Using a Stereo-based Camera
Negrillo, José / Feito, Francisco R. / Segura, Rafael J. / Ogayar, Carlos Javier / Fuertes, José Manuel / Lucena, Manuel | 2017
31
Google Tango Outdoors. Augmented Reality for Underground Infrastructures
Soria, Gregorio / Ortega, Lidia / Feito, Francisco R. | 2017
41
Direct Volume Rendering of Stack-Based Terrains
Graciano, Alejandro / Rueda, Antonio J. / Feito, Francisco R. | 2017
51
Downsampling and Storage of Pre-Computed Gradients for Volume Rendering
Díaz-García, Jesús / Brunet, Pere / Navazo, Isabel / Vázquez, Pere-Pau | 2017
61
3D GIS Based on WebGL for the Management of Underground Utilities
Jurado, Juan Manuel / Ortega, Lidia / Feito, Francisco R. | 2017
65
Fireman Rescue: A Serious Game for Fire Fighting Training
Ríos, Alejandro / Bonet, Carles / Morales, J. L. / Alavedra, Axel / París, Alejandro / Guillén, Marc | 2017
69
A Curvature-based Method for Identifying the Contact Zone Between Bone Fragments: First Steps
Jiménez-Pérez, J. Roberto / Paulano-Godino, Félix / Jiménez-Delgado, Juan J. | 2017
73
An Interactive Tool for Modeling Ancient Masonry Buildings
Fita, Josep Lluis / Besuievsky, Gonzalo / Patow, Gustavo | 2017
77
Transfer Learning for Illustration Classification
Lagunas, Manuel / Garces, Elena | 2017
87
Fast Stippling based on Weighted Centroidal Voronoi Diagrams
Gómez, Eila / Méndez, Elías / Arroyo, Germán / Martín, Domingo | 2017
97
Improved Intuitive Appearance Editing based on Soft PCA
Malpica, Sandra / Barrio, Miguel / Gutierrez, Diego / Serrano, Ana / Masia, Belen | 2017
107
Transient Photon Beams
Marco, Julio / Jarosz, Wojciech / Gutierrez, Diego / Jarabo, Adrian | 2017
113
Procedural Semantic Cities
Rogla, Otger / Pelechano, Nuria / Patow, Gustavo | 2017
121
Tree Variations
Argudo, Oscar / Andújar, Carlos / Chica, Antoni | 2017
131
Procedural Generation of Natural Environments with Restrictions
Gasch, Cristina / Chover, Miguel / Remolar, Inmaculada | 2017
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