Real-time Object Recognition with Pose Initialization for Large-scale Standalone Mobile Augmented Reality
KSII TRANSACTIONS ON INTERNET AND INFORMATION SYSTEMS
Authors: Lee, Suwon
Abstract
Mobile devices such as smartphones are very attractive targets for augmented reality (AR) services, but their limited resources make it difficult to increase the number of objects to be recognized. When the recognition process is scaled to a large number of objects, it typically requires significant computation time and memory. Therefore, most large-scale mobile AR systems rely on a server to outsource recognition process to a high-performance PC, but this limits the scenarios available in the AR services. As a part of realizing large-scale standalone mobile AR, this paper presents a solution to the problem of accuracy, memory, and speed for large-scale object recognition. To this end, we design our own basic feature and realize spatial locality, selective feature extraction, rough pose estimation, and selective feature matching. Experiments are performed to verify the appropriateness of the proposed method for realizing large-scale standalone mobile AR in terms of efficiency and accuracy.
Calorimetric and structural analysis of the Zr-Fe-Co-B-Mo-W amorphous alloys doped with gadolinium
JOURNAL OF ALLOYS AND COMPOUNDS
Authors: Kotynia, Katarzyna; Pawlik, Piotr; Filipecka, Katarzyna; Filipecki, Jacek
Abstract
The paper presents the calorimetric and structural analysis of the rapidly solidified GdxZr10Fe58-xCo10B15Mo5W2 (where: x = 0, 1, 2, 3, 4, 5) alloy ribbons in as-cast state. The base alloys were obtained by the arc-melting of the high purity constituent elements under a low pressure of Ar protective atmosphere. Subsequently, the ribbon samples were produced by the single-roll melt spinning technique under the low Ar pressure at the linear velocity of the copper roll surface of 32 m/s. X-ray diffraction (XRD) studies have shown amorphous structure of all the alloy. The microstructure of the samples was examined by scanning electron microscopy (SEM). Differential scanning calorimetry (DSC) measurements were performed at various heating rates. These allowed to determine the thermal stability of the amorphous phase. The Kissinger, Ozawa and Augis-Bennett plots were constructed to determine the activation energies E-a for crystallization. The positron annihilation lifetime spectroscopy (PALS) was used to study the structural changes as well as a degree of disorder in the atomic structure caused by doping the base alloy with Gd. (C) 2020 Elsevier B.V. All rights reserved.