Because of their visual characteristic which consists of black background versus white foreground, extracting relevant descriptors from medical X-ray images remains a challenging problem for medical imaging researchers. In this paper, we conduct an empirical comparison of several feature descriptors in order to evaluate their efficiency in content based X-ray image retrieval. We use a collectio...

The Chandra X-Ray Observatory observed the Crab Nebula and pulsar during orbital calibration. Zeroth-order images with the High-Energy Transmission Grating (HETG) readout by the Advanced CCD Imaging Spectrometer spectroscopy array (ACIS-S) show a striking richness of X-ray structure at a resolution comparable to that of the best ground-based visible-light observations. The HETG-ACIS-S images re...

Object recognition in X-ray images is an interesting application of machine vision that can help reduce the workload of human operators of X-ray scanners at security checkpoints. However, automatic inspection systems using machine vision techniques are not yet commonplace for generic threat detection in X-ray images. Moreover, this problem has not been well explored by machine vision community ...

Within the framework of refining an articulatory model, articulatory data were collected using MRI, video and X-ray. A set of two-to-three dimensional rules were derived from the axial and coronal MRI images and applied to midsagittal X-ray images. The acoustic performance of the rules was evaluated by synthesizing observed and predicted area functions.

A novel two dimensional imaging technique of the chemical bonding state was developed by combining the extended X-ray emission fine structure method with an electron probe X-ray microanalyzer mapping technology. With this method, chemical state images of some aluminum standard samples were obtained. It was confirmed that the obtained images provide correct information of chemical states.

Charge-injection devices (CIDs) are being used to image x rays in laser-fusion experiments on the University of Rochester's OMEGA Laser System. The CID cameras are routinely used up to the maximum neutron yields generated (∼10(14) DT). The detectors are deployed in x-ray pinhole cameras and Kirkpatrick-Baez microscopes. The neutron fluences ranged from ∼10(7) to ∼10(9) neutrons/cm(2) and useful...

We present an efficient GPU-based method to generate virtual X-ray images from tetrahedral meshes which are associated with attenuation values. In addition, a novel approach is proposed that performs the model deformation on the GPU. The tetrahedral grids are derived from volumetric statistical shape and intensity models (SSIMs) and describe anatomical structures. Our research targets at recons...

The realm of mixed reality applications lies in blending rendered images with images of the real world. This requires highly realistic rendered images in order to seamlessly blend between those two worlds. However, current rasterization technology severely limits the achievable realism and imposes strict limits on the scene complexity and the optical effects that can be simulated efficiently. R...