68 research outputs found
Matter near to the Endpoint of the Electroweak Phase Transition
Wave functions and the screening mass spectrum in the 3D SU(2)-Higgs model
near to the phase transition line below the endpoint and in the crossover
region are calculated. In the crossover region the changing spectrum versus
temperature is examined showing the aftermath of the phase transition at lower
Higgs mass. Large sets of operators with various extensions are used allowing
to identify wave functions in position space.Comment: 3 pages, 8 figures, LaTex+espcrc2.sty; LATTICE98(electroweak
Hot electroweak matter near to the endpoint of the phase transition
The electroweak phase transition is investigated near to its endpoint in the
framework of an effective three-dimensional model. We measure the very weak
interface tension with the tunneling correlation length method. First results
for the mass spectrum and the corresponding wave functions in the symmetric
phase are presented.Comment: 3 pages, 5 figures, uses espcrc2.sty, contribution to LATTICE9
SITE CALIBRATION WITH PROJ AND WKT2
In surveying projects, a site calibration is the solution to the problem of finding a transformation between the coordinate space of a site local coordinate reference system and a well known coordinate reference system given a set of pairs of corresponding coordinates. A site calibration enables the localization of new positions with cm accuracy using a RTK/PPK GNSS receiver and a transformation, which is a much more cost-effective than using a total station and much faster than other more traditional surveying methods. While site calibration is featured by almost every modern professional-grade GNSS receiver, the implementation is closed source and the output stored in proprietary file formats, tying the user to the vendorâs ecosystem. In this paper we propose a complete solution to the site calibration problem that can be fully implemented with open source software (in particular PROJ for coordinate transformations) and whose output can be represented in terms of an open standard (WKT version 2). Two methods and representations of a site calibration are described, a fully 3D one and a split horizontal and vertical one. Our main contribution is the openness and interoperability of the solution. Another important contribution is the analysis of the sensitivity of these solutions to measurement errors
Keypoint Recognition using Random Forests and Random Ferns
In many 3-D object-detection and pose-estimation problems, run-time performance is of critical importance. However, there usually is time to train the system. We introduce an approach that takes advantage of this fact by formulating wide-baseline matching of keypoints extracted from the input images to those found in the model images as a classification problem. This shifts much of the computational burden to a training phase and eliminates the need for expensive patch preprocessing, without sacrificing recognition performance. This makes our approach highly suitable for real-time operations on low-powered devices. To this end, we developed two related methods. The first uses Random Forests that rely on simple binary tests on image intensities surrounding the keypoints. In the second, we flatten the trees to turn them into simple bit strings, which we will refer to as Ferns, and combine their output in a Naive Bayesian manner. Surprisingly, the Ferns, while simpler, actually perform better than the trees. This is because the Naive Bayesian approach benefits more from the thousands of synthetic training examples we can generate than output averaging as usually performed by Random Forests. Furthermore, the more general partition that the trees allow does not appear to be of great use for our problem
The Accuracy of Automatic Photogrammetric Techniques on Ultra-light UAV Imagery
This paper presents an affordable, fully automated and accurate mapping solutions based on ultra-light UAV imagery. Several datasets are analysed and their accuracy is estimated. We show that the accuracy highly depends on the ground resolution (flying height) of the input imagery. When chosen appropriately this mapping solution can compete with traditional mapping solutions that capture fewer high-resolution images from airplanes and that rely on highly accurate orientation and positioning sensors on board. Due to the careful integration with recent computer vision techniques, the post processing is robust and fully automatic and can deal with inaccurate position and orientation information which are typically problematic with traditional techniques
3D modeling and registration under wide baseline conditions
During the 90s important progess has been made in the area of structure-from-motion. From a series of closely spaced images a 3D model of the observed scene can now be reconstructed, without knowledge about the subsequent camera positions or settings. From nothing but a video, the camera trajectory and scene shape are extracted. Progress has also been important in the area of structured light techniques. Rather than having to use slow and/or bulky laser scanners, compact one-shot systems have been developed. Upon projection of a pattern onto the scene, its 3D shape and texture can be extracted from a single image. This paper presents recent extensions on both strands, that have a common theme: how to cope with large baseline conditions. In the case of shape-from-video we discuss ways to find correspondences and, hence, extract 3D shapes even when the images are taken far apart. In the case of structured light, the problem solved is how to combine partial 3D patches into complete models, without a good initialisation of their relative poses.
CorrespondĂȘncia eficiente de descritores SIFT para construção de mapas densos de pontos homĂłlogos em imagens de sensoriamento remoto
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