TY - GEN A1 - Hege, Hans-Christian A1 - Seebass, Martin A1 - Stalling, Detlev A1 - Zöckler, Malte T1 - A Generalized Marching Cubes Algorithm Based on Non-Binary Classifications N2 - We present a new technique for generating surface meshes from a uniform set of discrete samples. Our method extends the well-known marching cubes algorithm used for computing polygonal isosurfaces. While in marching cubes each vertex of a cubic grid cell is binary classified as lying above or below an isosurface, in our approach an arbitrary number of vertex classes can be specified. Consequently the resulting surfaces consist of patches separating volumes of two different classes each. Similar to the marching cubes algorithm all grid cells are traversed and classified according to the number of different vertex classes involved and their arrangement. The solution for each configuration is computed based on a model that assigns probabilities to the vertices and interpolates them. We introduce an automatic method to find a triangulation which approximates the boundary surfaces - implicitly given by our model - in a topological correct way. Look-up tables guarantee a high performance of the algorithm. In medical applications our method can be used to extract surfaces from a 3D segmentation of tomographic images into multiple tissue types. The resulting surfaces are well suited for subsequent volumetric mesh generation, which is needed for simulation as well as visualization tasks. The proposed algorithm provides a robust and unique solution, avoiding ambiguities occuring in other methods. The method is of great significance in modeling and animation too, where it can be used for polygonalization of non-manifold implicit surfaces. T3 - ZIB-Report - SC-97-05 Y1 - 1997 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-2741 ER - TY - GEN A1 - Stalling, Detlev A1 - Zöckler, Malte A1 - Hege, Hans-Christian T1 - Fast Display of Illuminated Field Lines N2 - A new technique for interactive vector field visualization using large numbers of properly illuminated field lines is presented. Taking into account ambient, diffuse, and specular reflection terms as well as transparency and depth cueing, we employ a realistic shading model which significantly increases quality and realism of the resulting images. While many graphics workstations offer hardware support for illuminating surface primitives, usually no means for an accurate shading of line primitives are provided. However, we show that proper illumination of lines can be implemented by exploiting the texture mapping capabilities of modern graphics hardware. In this way high rendering performance with interactive frame rates can be achieved. We apply the technique to render large numbers of integral curves of a vector field. The impression of the resulting images can be further improved by a number of visual enhancements, like transparency and depth-cueing. We also describe methods for controlling the distribution of field lines in space. These methods enable us to use illuminated field lines for interactive exploration of vector fields. T3 - ZIB-Report - SC-96-58 Y1 - 1997 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-2686 ER - TY - JOUR A1 - Rein, Karlheinz A1 - Zöckler, Malte A1 - T. Mader, Michael A1 - Grübel, Cornelia A1 - Heisenberg, Martin T1 - The Drosophila Standard Brain JF - Current Biology Y1 - 2002 U6 - https://doi.org/10.1016/S0960-9822(02)00656-5 VL - 12 IS - 3 SP - 227 EP - 231 ER - TY - JOUR A1 - Zöckler, Malte A1 - Stalling, Detlev T1 - Using confocal microscopy and advanced 3-d visualization to investigate the Drosophila brain JF - Scientific Computing & Instrumentation Y1 - 2002 ER - TY - CHAP A1 - Zöckler, Malte A1 - Stalling, Detlev A1 - Hege, Hans-Christian T1 - Parallel Line Integral Convolution T2 - Proc. First Eurographics Workshop on Parallel Graphics and Visualization Y1 - 1996 U6 - https://doi.org/10.1016/S0167-8191(97)00039-2 SP - 111 EP - 128 CY - Bristol, U.K. ER - TY - CHAP A1 - Zöckler, Malte A1 - Stalling, Detlev A1 - Hege, Hans-Christian T1 - Interactive Visualization of 3D-Vector Fields Using Illuminated Streamlines T2 - Proc. IEEE Visualization 1996 Y1 - 1996 U6 - https://doi.org/10.1109/VISUAL.1996.567777 SP - 107 EP - 113 CY - San Fransisco ER - TY - JOUR A1 - Zöckler, Malte A1 - Stalling, Detlev A1 - Hege, Hans-Christian T1 - Fast and Intuitive Generation of Geometric Shape Transitions JF - The Visual Computer Y1 - 2000 U6 - https://doi.org/10.1007/PL00013396 VL - 16(5) SP - 241 EP - 253 ER - TY - CHAP A1 - Stalling, Detlev A1 - Zöckler, Malte A1 - Hege, Hans-Christian T1 - Segmentation of 3D Medical Images with Subvoxel Accuracy T2 - Proc. CARS ’98 Computer Assisted Radiology and Surgery Y1 - 1998 SP - 137 EP - 142 CY - Tokyo ER - TY - CHAP A1 - Schirmacher, Hartmut A1 - Zöckler, Malte A1 - Stalling, Detlev A1 - Hege, Hans-Christian ED - Girod, Bernd ED - Niemann, Heinrich ED - Seidel, Hans T1 - Boundary Surface Shrinking - a Continuous Approach to 3D Center Line Extraction T2 - Proc. of IMDSP’98, held in Alpbach Y1 - 1998 SP - 25 EP - 28 CY - Austria ER - TY - JOUR A1 - Stalling, Detlev A1 - Zöckler, Malte A1 - Hege, Hans-Christian T1 - Fast Display of Illuminated Field Lines JF - IEEE Transactions on Visualization and Computer Graphics Y1 - 1997 U6 - https://doi.org/10.1109/2945.597795 VL - 3 IS - 2 SP - 118 EP - 128 ER - TY - CHAP A1 - Seebaß, Martin A1 - Stalling, Detlev A1 - Zöckler, Malte A1 - Hege, Hans-Christian A1 - Wust, Peter A1 - Felix, Roland A1 - Deuflhard, Peter T1 - Surface Mesh Generation for Numerical Simulations of Hyperthermia Treatments T2 - Proceedings of the 16th Annual Meeting of the European Society for Hyperthermic Oncology (ESHO-97) Y1 - 1997 SP - 146 ER - TY - CHAP A1 - Brandt, Robert A1 - Malun, Dagmar A1 - Steege, A. A1 - Zöckler, Malte A1 - Menzel, Randolf T1 - Three Dimensional Reconstruction of Honey Bee Mushroom Bodies T2 - Annual Meeting of the Society for Neuroscience, Abstr. 25 Y1 - 1999 SP - 861 ER - TY - JOUR A1 - Rein, Karlheinz A1 - Zöckler, Malte A1 - Heisenberg, Martin T1 - A Quantitative Three-Dimensional Model of the Drosophila Optic Lobes JF - Current Biology Y1 - 1999 VL - 9 IS - 2 SP - 93 EP - 96 ER - TY - CHAP A1 - Rein, Karlheinz A1 - Zöckler, Malte A1 - Heisenberg, Martin ED - Schnitzler, H. T1 - Towards a Quantative 3D Model of the Fly Brain T2 - Proc. 27th Göttingen Neurobiology Report Y1 - 1999 SP - 742 PB - G. Thieme Verlag CY - Stuttgart, Germany ER - TY - CHAP A1 - Rein, Karlheinz A1 - Zöckler, Malte A1 - Heisenberg, Martin T1 - A Quantitative 3D Model of the Flybrain: Shape and Arrangement of Neuropils T2 - Proc. First Vogt-Brodmann Symposium: Perspectives of Architectonic Brain Mapping Y1 - 1999 CY - Düsseldorf /Jülich ER - TY - CHAP A1 - Rein, Karlheinz A1 - Zöckler, Malte A1 - Heisenberg, Martin T1 - A Deformable 3D Model of the Fly Brain T2 - Proc. Int. Conf. Neurobiology of Drosophila Y1 - 1999 PB - Cold Spring Harbor CY - New York, USA ER - TY - THES A1 - (née Zöckler), Malte T1 - Efficient Visualization and Reconstruction of 3D Geometric from Neuro-Biological Confocal Microscope Scans Y1 - 2003 ER - TY - THES A1 - Zöckler, Malte T1 - Molekulardynamische Simulation des Wachstums zirkumstellarer Silikatstaubteilchen Y1 - 1997 ER - TY - GEN A1 - Stalling, Detlev A1 - Zöckler, Malte A1 - Sander, Oliver A1 - Hege, Hans-Christian T1 - Weighted Labels for 3D Image Segmentation N2 - Segmentation tools in medical imaging are either based on editing geometric curves or on the assignment of region labels to image voxels. While the first approach is well suited to describe smooth contours at subvoxel accuracy, the second approach is conceptually more simple and guarantees a unique classification of image areas. However, contours extracted from labeled images typically exhibit strong staircase artifacts and are not well suited to represent smooth tissue boundaries. In this paper we describe how this drawback can be circumvented by supplementing region labels with additional weights. We integrated our approach into an interactive segmentation system providing a well-defined set of manual and semi-automatic editing tools. All tools update both region labels as well as the corresponding weights simultaneously, thus allowing one to define segmentation results at high resolution. We applied our techniques to generate 3D polygonal models of anatomical structures. T3 - ZIB-Report - SC-98-39 KW - image processing KW - segmentation Y1 - 1998 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-3828 ER - TY - GEN A1 - Zöckler, Malte A1 - Stalling, Detlev A1 - Hege, Hans-Christian T1 - Fast and Intuitive Generation of Geometric Shape Transitions N2 - We describe a novel method for continuously transforming two triangulated models of arbitrary topology into each other. Equal global topology for both objects is assumed, extensions for genus changes during metamorphosis are provided. The proposed method addresses the major challenge in 3D metamorphosis, namely specifying the morphing process intuitively, with minimal user interaction and sufficient detail. Corresponding regions and point features are interactively identified. These regions are parametrized automatically and consistently, providing a basis for smooth interpolation. Utilizing suitable 3D interaction techniques a simple and intuitive control over the whole morphing process is offered. T3 - ZIB-Report - SC-99-33 KW - morphing KW - surface parametrization KW - shape transition Y1 - 1999 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-4219 ER - TY - GEN A1 - Zöckler, Malte A1 - Rein, Karlheinz A1 - Brandt, Robert A1 - Stalling, Detlev A1 - Hege, Hans-Christian T1 - Creating Virtual Insect Brains with Amira N2 - By combining techniques of preparation, histology, confocal microscopy, data visualization and data processing, we have created and recently published a standard brain model for drosophila and honey bee brains. This report describes the algorithms and implementation of the corresponding software modules. At the same time it serves as a user's guide for scientist who want to reproduce the results for differerent species or mutants. T3 - ZIB-Report - 01-32 KW - visualization KW - anatomical atlas Y1 - 2001 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-6589 ER - TY - GEN A1 - Stalling, Detlev A1 - Seebass, Martin A1 - Zöckler, Malte A1 - Hege, Hans-Christian T1 - Hyperthermia Treatment Planning with HyperPlan - User's Manual N2 - HyperPlan is a software system for performing 3D-simulations and treatment planning in regional hyperthermia. It allows the user to understand the complex effects of electromagnetic wave propagation and heat transport inside a patient's body. Optimized power amplitudes and phase settings can be calculated for the BSD radiowave applicators Sigma 60 and Sigma 2000 (eye-applicator). HyperPlan is built on top of the modular, object-oriented visualization system Amira. This system already contains powerful algorithms for image processing, geometric modelling and 3D graphics display. HyperPlan provides a number of hyperthermia-specific modules, allowing the user to create 3D tetrahedral patient models suitable for treatment planning. In addition, all numerical simulation modules required for hyperthermia simulation are part of HyperPlan. This guide provides a step-by-step introduction to hyperthermia planning using HyperPlan. It also describes the usage of the underlying visualization system Amira. T3 - ZIB-Report - 00-27 KW - image segmentation KW - grid generation KW - visualization KW - therapy planning Y1 - 2000 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-5957 ER -