Neophytos Neophytou

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Splatting is a popular technique for volume rendering, where voxels are represented by Gaussian kernels, whose pre-integrated footprints are accumulated to form the image. Splatting has been mainly used to render pre-shaded volumes, which can result in significant blurring in zoomed views. This can be avoided in the image-aligned splatting scheme, where one(More)
Commodity graphics hardware boards (GPUs) have achieved remarkable speedups in various sub-areas of Computed Tomography (CT). This paper takes a close look at the GPU architecture and its programming model and describes a successful acceleration of Feldkamp’s cone-beam CT reconstruction algorithm. Further, we will also have a comparative look at the new(More)
1 Center for Visual Computing and Department of Computer Science Stony Brook University weihong@cs.sunysb.edu 2 Center for Visual Computing and Department of Computer Science Stony Brook University nneophyt@cs.sunysb.edu 3 Center for Visual Computing and Department of Computer Science Stony Brook University mueller@cs.sunysb.edu 4 Center for Visual(More)
This paper discusses how to squeeze volume rendering into as few bits per operation as possible while still retaining excellent image quality. For each of the typical volume rendering pipeline stages in texture map volume rendering, ray casting and splatting we provide a quantitative analysis of the theoretical and practical limits for the required bit(More)
Color-space CAD is an interactive image-processing framework that lets users manipulate colors directly in 3D perceptual color space. Unlike traditional 2D color- manipulation tools, which often require multiple iterations, color-space CAD allows direct 3D navigation of the solution space. The framework uses graphics hardware to accelerate the(More)
ÐThis paper describes Net-dbx, a tool that utilizes Java and other World Wide Web tools for the debugging of MPI programs from anywhere in the Internet. Net-dbx is a source-level interactive debugger with the full power of gdb (the GNU Debugger) augmented with the debug functionality of the public-domain MPI implementation environments. The main effort was(More)
We theoretically investigate the thermoelectric properties of zigzag graphene nanoribbons in the presence of extended line defects, substrate impurities, and edge roughness along the nanoribbon’s length. A nearest-neighbor tight-binding model for the electronic structure and a fourth nearest-neighbor force constant model for the phonon bandstructure are(More)
The mobility of p-type nanowires (NWs) with diameters of D = 12 nm down to D = 3 nm in [100], [110], and [111] transport orientations is calculated. An atomistic tight-binding model is used to calculate the NW electronic structure. Linearized Boltzmann transport theory is applied, including phonon and surface roughness scattering (SRS) mechanisms, for the(More)