Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 11 of 11 for “"Ray Casting"”.
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Interactive freeform solid modeling with haptic interface
… of the tool swept volume, and based on the ray-casting method to perform Boolean operations between the tool swept volume and the virtual stock in dexel data to simulate the sculpting process. A new method for surface reconstruction from dexel data is presented"--Abstract, page iii.
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Localizing, modeling, and drifting an autonomous RACECAR
… algorithm for high performance two-dimensional ray casting in occupancy grid maps, called the Compressed Directional Distance Transform (CDDT). Here, I will discuss the theory and characteristics of the CDDT algorithm, which has been implemented in RangeLibc, my open-source software library.
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Rigid registration of MR and biplanar fluoroscopy
… processing time relative even to optimized ray-casting methods. The computational efficiency of voxel-projection makes it a useful tool for the investigation of similarity measures in this 3D-2D context. Its speed may also enable 3D-2D registration methods which rely on evaluation of a …
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Automatic pre-treatment validation in radiotherapy by computer aided 3D-2D image alignment
… of object contours from the orthogonal X-ray images, matching with the 3D contours automatically extracted from the planning CT data. The registration is based on the Z-bnffer projection algorithm and the iterative closest point (ICP) algorithm. The novelty of the method proposed by the …
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Techniques for Stochastic Implicit Surface Modelling and Rendering
… algorithms are proposed. First, an improved ray casting method is presented that guarantees correct intersections between view rays and the surface. Second, a new progressive refinement rendering algorithm is proposed that provides a dynamic rendering environment where the image quality …
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Optimisation of computed radiography chest imaging utilising a novel simulation technique derived from real patient computed tomography data sets
… data sets is presented. The algorithm uses a ray casting DRR calculation method to project X-ray pencil beams through CT data and derive the photon energy absorbed in a virtual computed radiography (CR) phosphor. Radiation scatter and CR system noise are added post DRR calculation.Quantitative …
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Three-dimensional cloud volume reconstruction from the Multi-angle Imaging SpectroRadiometer
… cloud masks. For the reconstruction method, “ray casting” algorithms that fully account for the instrument's geometric properties are developed. The reconstruction results are presented for three hand-picked MISR cloud scenes. Strengths and limitations of the reconstruction method are …
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Visual-auditory visualisation of dynamic multi-scale heterogeneous objects.
… benefits from a combination of GPU accelerated ray-casting, geometry, optical and auditory properties modelling. We discuss how the modern GPU techniques application in those areas allows introducing a unified approach to the visual-auditory analysis of dynamic multi-scale heterogeneous objects. …
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Visualization and Analysis Tools for Neuronal Tissue
… scenes to be described and revisited. Finally, ray-casting support allows numerous analytical features, including 3D distance and volume measurements, computation and presentation of statistics, and point-and-click retrieval and presentation of raw electron microscopy data. The extension of this …
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Robotics and Virtual Reality for Optical Coherence Tomography-Guided Ophthalmic Surgery and Diagnostics
… data organization techniques for high-frame rate ray casting at 180 fps. We conduct performance analyses of these techniques, develop an interactive VR-OCT viewer, and demonstrate guidance of mock surgical procedures exclusively by live OCT and video feedthrough from within immersive …
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Vizualizace objemových dat pomocí volume renderingu
V teoretické části se práce obecně zaměřuje na problematiku zobrazování objemových dat, vzájemně srovnává a hodnotí jednotlivé přístupy a čtenáři tak poskytuje dobrou základní orientaci v tematice. Podrobně jsou pak analyzovány metody vizualizace objemových dat pomocí mapování textur a pomocí …