In this study, an airborne alpha detection system, which consists of a passivated implanted planar silicon (PIPS) detector and air filter, was developed. A collimator applied to the system showed enhancement in resolution degradation efficiency. The efficiency were compared analyzed evaluate performance collimator. Thus, found be more important than as determining factor performance, from viewp...

To avoid the complexity of the edge definition by the half width, a new approach to defining the leeward edge of the planar jet in crossflow is introduced in this paper. Particle Image Velocimetry (PIV) experiments were performed to measure different flow regimes within the single jet and the dual jets configurations in crossflow. Based on the experimental data acquired, a series of velocity pr...

We introduce an algorithm that automatically aligns images with partial wireframe models to compute extrinsic camera parameters with respect to the model reference frame. Aligned imagery is fused with the model to incorporate high-resolution textures and to facilitate context sensitive image processing. The technique is designed to exploit the approximately planar structure commonly found in hu...

This paper presents a stochastic grammar for finegrained 3D scene reconstruction from a single image. At the heart of our approach is a small number of grammar rules that can describe the most common geometric structures, e.g., two straights lines being co-linear or orthogonal, or that a line lying on a planar region etc. With these grammar rules, we re-frame single-view 3D reconstruction probl...

Recent advances of ToF depth sensor devices enables us to easily retrieve scene depth data with high frame rates. However, the resolution of the depth map captured from these devices is much lower than that of color images and the depth data suffers from the optical noise effects. In this paper, we propose an efficient algorithm that upsamples depth map captured by ToF depth cameras and reduces...

We consider the problem of aligning and calibrating a binocular pan-tilt device using visual information from controlled motions, while viewing a degenerate (planar) scene. By considering the invariants to controlled motions about pan and elevation axes while viewing the plane, we show how to construct the images of points at infinity in various visual directions. First, we determine an ideal p...

INTRODUCTION Among fast MRI methods, spiral imaging method has long been considered as an alternative to echo planar imaging (EPI). This is mainly due to the fact that the image quality of spiral imaging is better than EPI when motion is presented. In real-time imaging applications such as fluoroscopy, the superior motion property of spiral proves to be an advantage. On the other hand, spiral i...

We study the multi-frame structure from motion problem when the camera translates on a plane with small baselines and arbitrary rotations. This case shows up in many practical applications, for example, in ground robot navigation. We consider the framework for small baselines presented in [8], in which a factorization method is used to compute the structure and motion parameters accurately, eff...

We provide criteria for deciding whether a given planar curve is an image of a given spatial curve, obtained by a central or a parallel projection with unknown parameters. These criteria reduce the projection problem to a certain modification of the equivalence problem of planar curves under affine and projective transformations. The latter problem can be addressed using Cartan’s moving frame m...

This thesis describes a method of vision based station keeping and docking for floating robots. Due to the motion disturbances in the environment, these tasks are important to keep the vehicle stabilized relative to an external reference frame. A vision-based tracking system is used to measure the image deformations, as the vehicle moves with respect to a docking station. A planar surface is ch...