Posts
Dec, 13
Prototyping flexible touch screen devices using collocated haptic-graphic elastic-object deformation on the GPU
Rapid advances in flexible display technologies and the benefits that they provide are promising enough to consider them for futuristic mobile devices. Current prototyping methods lack facilities to simulate such flexible touch screen displays and the interaction with them. In this paper, we present a technique that provides product developers a tool to interactively simulate […]
Dec, 13
A generic library for structured real-time computations: GPU implementation applied to retinal and cortical vision processes
Most graphics cards in standard personal computers are now equipped with several pixel pipelines running shader programs. Taking advantage of this technology by transferring parallel computations from the CPU side to the GPU side increases the overall computational power even in non-graphical applications by freeing the main processor from an heavy work. A generic library […]
Dec, 13
GPU-Based Ray-Casting of Spherical Functions Applied to High Angular Resolution Diffusion Imaging
Any sufficiently smooth, positive, real-valued function $psi: S^2 rightarrow realset^+$ on a sphere $S^2$ can be expanded by a Laplace expansion into a sum of spherical harmonics. Given the Laplace expansion coefficients, we provide a CPU and GPU-based algorithm that renders the radial graph of $psi$ in a fast and efficient way by ray-casting the […]
Dec, 13
Wavefront raycasting using larger filter kernels for on-the-fly GPU gradient reconstruction
The quality of images generated by volume rendering strongly depends on the accuracy of gradient estimation. However, the most commonly used techniques for on-the-fly gradient reconstruction are still very simple, such as central differences; they generally gather only limited neighbourhood information and thus ultimately produce rather poor quality images. While there are many higher-order reconstruction […]
Dec, 13
Orders-of-magnitude performance increases in GPU-accelerated correlation of images from the International Space Station
We implement image correlation, a fundamental component of many real-time imaging and tracking systems, on a graphics processing unit (GPU) using NVIDIA’s CUDA platform. We use our code to analyze images of liquid-gas phase separation in a model colloid-polymer system, photographed in the absence of gravity aboard the International Space Station (ISS). Our GPU code […]
Dec, 13
Development of a GPU-based multithreaded software application to calculate digitally reconstructed radiographs for radiotherapy
To provide faster calculation of digitally reconstructed radiographs (DRRs) in patient-positioning verification, we developed and evaluated a graphic processing unit (GPU)-based DRR software application and compared it with a central processing unit (CPU)-based application. The evaluation metrics were calculation speed and image quality for various slice thicknesses. The results showed that the GPU-based DRR computation […]
Dec, 13
Seeded ND medical image segmentation by cellular automaton on GPU
PURPOSE: We present a GPU-based framework to perform organ segmentation in N-dimensional (ND) medical image datasets by computation of weighted distances using the Ford-Bellman algorithm (FBA). Our GPU implementation of FBA gives an alternative and optimized solution to other graph-based segmentation techniques. METHODS: Given a number of K labelled-seeds, the segmentation algorithm evolves and segments […]
Dec, 13
Real-time anomaly detection in hyperspectral images using multivariate normal mixture models and GPU processing
Hyperspectral imaging, which records a detailed spectrum of light arriving in each pixel, has many potential uses in remote sensing as well as other application areas. Practical applications will typically require real-time processing of large data volumes recorded by a hyperspectral imager. This paper investigates the use of graphics processing units (GPU) for such real-time […]
Dec, 13
Fast and automatic object pose estimation for range images on the GPU
We present a pose estimation method for rigid objects from single range images. Using 3D models of the objects, many pose hypotheses are compared in a data-parallel version of the downhill simplex algorithm with an image-based error function. The pose hypothesis with the lowest error value yields the pose estimation (location and orientation), which is […]
Dec, 13
Vortex methods for incompressible flow simulations on the GPU
We present a remeshed vortex particle method for incompressible flow simulations on GPUs. The particles are convected in a Lagrangian frame and are periodically reinitialized on a regular grid. The grid is used in addition to solve for the velocity-vorticity Poisson equation and for the computation of the diffusion operators. In the present GPU implementation […]
Dec, 13
A GPU Tile-Load-Map architecture for terrain rendering: theory and applications
This paper describes a robust, modular, complete GPU architecture – the Tile-Load-Map (TLM) – designed for the real-time visualization of wide textured terrains created with arbitrary meshes. It extends and completes our previous succinct paper Amara et al. (ISVC 2007, Part 1, Lecture Notes in Computer Science, vol. 4841, pp. 586-597, Springer, Berlin, 2007) by […]
Dec, 13
Visual-model-based, real-time 3D pose tracking for autonomous navigation: methodology and experiments
This paper presents a novel 3D-model-based computer-vision method for tracking the full six degree-of-freedom (dof) pose (position and orientation) of a rigid body, in real-time. The methodology has been targeted for autonomous navigation tasks, such as interception of or rendezvous with mobile targets. Tracking an object’s complete six-dof pose makes the proposed algorithm useful even […]
