Einabadi, Farshad and Grau, Oliver
Light Harmonisation for Virtual Production
Proceedings of the 13th European Conference on Visual Media Production (CVMP 2016) (Short Paper)
December 2016
Dahmen, Tim, Jonge, Niels De, Trampert, Patrick, Engstler, Michael and Pauly, Christoph
Smart Microscopy: Feature Based Adaptive Sampling for Focused Ion Beam Scanning Electron Microscopy
Volume 22 , page 632--633.
July 2016

Abstract: A new method for the image acquisition in scanning electron microscopy (SEM) was introduced. The method used adaptively increased pixel-dwell times to improve the signal-to-noise ratio (SNR) in areas of high detail. In areas of low detail, the electron dose was reduced on a per pixel basis, and a-posteriori image processing techniques were applied to remove the resulting noise. The technique was realized by scanning the sample twice. The first, quick scan used small pixel-dwell times to generate a first, noisy image using a low electron dose. This image was analyzed automatically, and a software algorithm generated a sparse pattern of regions of the image that require additional sampling. A second scan generated a sparse image of only these regions, but using a highly increased electron dose. By applying a selective low-pass filter and combining both datasets, a single image was generated. The resulting image exhibited a factor of ≈3 better SNR than an image acquired with uniform sampling on a Cartesian grid and the same total acquisition time. This result implies that the required electron dose (or acquisition time) for the adaptive scanning method is a factor of ten lower than for uniform scanning.

Trampert, Patrick, Bogachev, Sviatoslav, Marniok, Nico, Dahmen, Tim and Slusallek, Philipp
A Comparative Study of Three Marker Detection Algorithms in Electron Tomography.
Volume 22 , page 0.
July 2016

Keywords: electron tomography,marker detection,particle detection,tomographic reconstruction

Abstract: We conducted a comparative study of three widely used algorithms for the detection of fiducial\backslashnmarkers in electron microscopy images. The algorithms were applied to four datasets from different sources. For\backslashnthe purpose of obtaining comparable results, we introduced figures of merit and implemented all three algorithms\backslashnin a unified code base to exclude software-specific differences. The application of the algorithms revealed that\backslashnnone of the three algorithms is superior to the others in all cases. This leads to the conclusion that the choice of a\backslashnmarker detection algorithm highly depends on the properties of the dataset to be analyzed, even within the\backslashnnarrowed domain of electron tomography

Trampert, Patrick, Chen, Delei, Bogachev, Sviatoslav, Dahmen, Tim and Slusallek, Philipp
Dictionary-based Filling of the Missing Wedge in Electron Tomography .
Volume 22 , page 554--555.
July 2016

Abstract: A new method for dealing with electron tomography data from incomplete projection sets is proposed. The approach is inspired by exemplar-based inpainting techniques in image processing [1] and heuristically generates data for missing projection directions. The method has also been extended to work on three dimensional data. In general, electron tomography reconstructions suffer from elongation artifacts along the beam direction at 0° tilt. These artifacts can be seen in the corresponding Fourier domain as a missing wedge. The new method synthetically generates projections for these missing directions with the help of a dictionary-based approach that is able to convey both structure and texture at the same time. It constitutes a preprocessing step that can be combined with any tomographic reconstruction algorithm. The new algorithm was applied to the well-known Shepp-Logan phantom. Visually, the synthetic projections, reconstructions, and corresponding Fourier power spectra showed a decrease of the typical missing wedge artifacts. Quantitatively, the inpainting method is capable to reduce missing wedge artifacts and improves tomogram quality with respect to several figures-of-merit.

Lemme, Stefan, Sutter, Jan, Schlinkmann, Christian and Slusallek, Philipp
The Basic Building Blocks of Declarative 3D on the Web
Proceedings of the 21st International Conference on Web3D Technology of Web3D '16 , page 17-25.
Publisher: ACM, New York, NY, USA
July 2016

Keywords: Dec3D, HTML, X3DOM, XML3D, web components

Abstract: WebGL enabled real-time 3D graphics on the Web. With the objective to integrate 3D graphics into the rest of the Web technology stack, and to make it easier for Web developers to develop interactive 3D graphics, Declarative 3D approaches were developed: X3DOM and XML3D. While the former focuses on backward-compatibility to X3D and a large set of convenience elements, the latter attempts to define a minimal set of flexible elements as an extension to HTML5. It has now been more than 6 years since Declarative 3D was first proposed for the Web. However, despite their different philosophies neither X3DOM nor XML3D has yet been able to achieve the same momentum and adoption rate as imperative frameworks like three.js. In the meantime, the underlying Web technology stack has made significant advances. In this paper we revisit both approaches in light of new Web technologies, such as Web Components, to define a small set of core elements that can provide the convenience of X3DOM while remaining as flexible and customizable as XML3D. Further, we present a strategy for building upon these core elements to enable user-defined elements, with the ability to cover domain-specific needs in Declarative 3D. Lastly, we show how these concepts can be used to simplify existing approaches (i.e. X3DOM and XML3D) and provide the basic building blocks of Declarative 3D on the Web.

Limberger, Daniel, Scheibel, Willy, Lemme, Stefan and Döllner, Jürgen
Dynamic 2.5D Treemaps Using Declarative 3D on the Web
Proceedings of the 21st International Conference on Web3D Technology of Web3D '16 , page 33-36.
Publisher: ACM, New York, NY, USA
July 2016

Keywords: 2.5D treemap, Dec3D, X3DOM, XML3D, glTF

Abstract: The 2.5D treemap represents a general purpose visualization technique to map multi-variate hierarchical data in a scalable, interactive, and consistent way used in a number of application fields. In this paper, we explore the capabilities of Declarative 3D for the web-based implementation of 2.5D treemap clients. Particularly, we investigate how X3DOM and XML3D can be used to implement clients with equivalent features that interactively display 2.5D treemaps with dynamic mapping of attributes. We also show a first step towards a glTF-based implementation. These approaches are benchmarked focusing on their interaction capabilities with respect to rendering and speed of dynamic data mapping. We discuss the results for our representative example of a complex 3D interactive visualization technique and summerize recommendations for improvements towards operational web clients.


Trottnow, Jonas, Götz, Kai, Seibert, Stefan, Spielmann, Simon, Helzle, Volker, Einabadi, Farshad, Sielaff, Clemens K. H. and Grau, Oliver
Intuitive Virtual Production Tools for Set and Light Editing
Proceedings of the 12th European Conference on Visual Media Production (CVMP 2015)
Publisher: ACM, New York, NY, USA,
November 2015
ISBN: 978-1-4503-3560-7/15/11
Einabadi, Farshad and Grau, Oliver
Discrete Light Source Estimation from Light Probes for Photorealistic Rendering
In Xianghua Xie, Mark W. Jones, and Gary K. L. Tam, editor, Proceedings of the British Machine Vision Conference (BMVC) , page 43.1-43.10.
Publisher: BMVA Press,
September 2015
ISBN: 1-901725-53-7
Sutter, Jan, Sons, Kristian and Slusallek, Philipp
A CSS Integration Model for Declarative 3D
Proceedings of the 20th International Conference on 3D Web Technology of Web3D '15 , page 209--217.
Publisher: ACM, New York, NY, USA
July 2015
ISBN: 978-1-4503-3647-5


Maisl, Michael, Marsalek, Lukas, Schorr, Christian, Horacek, Jan and Slusallek, Philipp
GPU-accelerated computed laminography with application to non-destructive testing
11th European Conference on Non-Destructive Testing (ECNDT 2014)
October 2014
Sutter, Jan, Sons, Kristian and Slusallek, Philipp
Blast: A Binary Large Structured Transmission Format for the Web
Proceedings of the Nineteenth International ACM Conference on 3D Web Technologies of Web3D '14 , page 45--52.
Publisher: ACM, New York, NY, USA
August 2014
ISBN: 978-1-4503-3015-2
Klein, Felix, Spieldenner, Torsten, Sons, Kristian and Slusallek, Philipp
Configurable Instances of 3D Models for Declarative 3D in the Web
Proceedings of the Nineteenth International ACM Conference on 3D Web Technologies , page 71-79.
Publisher: ACM, New York, NY, USA
ISBN: 978-1-4503-3015-2

Keywords: Web3D, WebGL, XML3D, assets, instancing

Abstract: The Declarative 3D for the Web initiative by the W3C [W3C 2011] connects 3D content to the Web document, intertwining it with other Web technologies known to millions of Web developers. The goal is to make 3D on the Web more accessible compared to low-level APIs such as WebGL. However, all proposals for Declarative 3D for the Web are missing an essential feature: configurable instances of structured 3D models. While instance mechanisms do exist, they all have limited capabilities to configure instances individually. In this paper we present a new approach for configurable instances of 3D models that is integrated into XML3D. Our approach comes with a compact interface, a powerful extension mechanism to handle configurations, and an efficient data structures for efficient instancing. We demonstrate how our instance mechanism simplifies the handling of 3D models in several different application areas, including Virtual Worlds, and provide several performance results for the instancing process.

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