Image identification is one of the most challenging tasks in different areas computer vision. Scale-invariant feature transform an algorithm to detect and describe local features images further use them as image matching criteria. In this paper, performance SIFT against various distortions such rotation, scaling, fisheye motion distortion are evaluated false true positive rates for a large number pairs calculated presented. We also evaluate distribution matched keypoint orientation...

In this paper, we introduce a novel algorithm for incorporating uncertainty into lookahead planning. Our searches through connected graphs with uncertain edge costs represented by known probability distributions. As robot moves the graph, true of adjacent edges are revealed to planner prior traversal. This locally information allows improve performance predicting benefit in future and updating plan accordingly an online manner. proposed algorithm, risk-aware graph search (RAGS), selects...

Small unmanned aircraft have become increasingly utilized for a wide range of applications; however such typically do not undergo the same rigorous safety protocols as larger human piloted counterparts. A thrust estimation quadcopter was developed and evaluated that could potentially improve flight control design by increasing sensory feedback information. Strain gauges were integrated into frame to provide total force measurements on each arm vehicle. To compensate inertial forces caused...

This paper describes the benefits of using a dropsonde to automatically provide real time wind data an autonomous descent vehicle (ADV). Two major sources error are identified: errors resulting from large scale temporal and/or spatial differences between forecast and actual columns (Type A), small fluctuations measurement inaccuracies typically in form noise B). An autonomously coupled dropsonde-ADV system was developed which is released preceding vehicle, with enough lead descend ground...

Abstract We describe a tool which supports the activity of human being in fitting mathematical model to measured or simulated data. The offers two principal advantages; its use requires minimum statistical knowledge, and visual interactive nature ensures that is intuitive. novel that, iterative often exploratory construction model, it represents graphically benefit all possible single changes existing model; selection action suffices add new term remove it. Copyright © 2001 John Wiley &...

Currently, flight testing of unmanned aircraft system (UAS) outdoors is heavily restricted and obtaining a certificate authorization from the FAA quite cumbersome, indoor can be cost prohibitive because relatively high expense motion capture systems. An alternative solution was developed tested in which an on-board camera used to provide absolute position vehicle environment for significantly less than any commercial system. For this system, attached underside UAS tracks markers that are...

This article illustrates a technique for visualizing nonlinear mappings ƒ:ℝk → ℝm that arise frequently in engineering applications. The idea is based on viewing sections ƒ−1(B) of the domain ℝk, and ƒ(A) range ℝm, respectively. After suitable discretization, such are easily approximated with familiar brushing operations scatterplot matrices. An obvious approach to discretization evaluate f factorial grid ℝk view by restriction its image. problem grids grow large quickly desirable numbers...

Abstract Thousands of balloon-assisted meteorological sensor packages, known as radiosondes, are launched every day from various monitoring stations across the continental United States. However, only a small fraction these instrument payloads ever recovered, with most ending up hazardous electronics waste strewn country. By creating terrestrial landing system that can be retrofitted to common commercially available survivability may able improved. Furthermore, such platform could also...