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  • 1
    Book
    Book
    2008
    ISBN: 9780470017043  ISBN: 047001704X  ISBN: 9780470699720  ISBN: 0470699728 
    Language: English
    Description: Computer vision encompasses the construction of integrated vision systems and the application of vision to problems of real-world importance. The process of creating 3D models is still rather difficult, requiring mechanical measurement of the camera positions or manual alignment of partial 3D views of a scene. However using algorithms, it is possible to take a collection of stereo-pair images of a scene and then automatically produce a photo-realistic, geometrically accurate digital 3D model.This book provides a comprehensive introduction to the methods, theories and algorithms of 3D computer vision. Almost every theoretical issue is underpinned with practical implementation or a working algorithm using pseudo-code and complete code written in C++ and MatLab®. There is the additional clarification of an accompanying website with downloadable software, case studies and exercises. Organised in three parts, Cyganek and Siebert give a brief history of vision research, and subsequently:  present basic low-level image processing operations for image matching, including a separate chapter on image matching algorithms;explain scale-space vision, as well as space reconstruction and multiview integration;demonstrate a variety of practical applications for 3D surface imaging and analysis;provide concise appendices on topics such as the basics of projective geometry and tensor calculus for image processing, distortion and noise in images plus image warping procedures.An Introduction to 3D Computer Vision Algorithms and Techniquesis a valuable reference for practitioners and programmers working in 3D computer vision, image processing and analysis as well as computer visualisation. It would also be of interest to advanced students and researchers in the fields of engineering, computer science, clinical photography, robotics, graphics and mathematics.
    Subject(s): Computer algorithms ; Computer vision ; Three-dimensional imaging
    ISBN: 9780470017043
    ISBN: 047001704X
    ISBN: 9780470699720
    ISBN: 0470699728
    Source: Wiley Online Library UBCM All Obooks
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  • 2
    Language: English
    In: Science (American Association for the Advancement of Science), 2017-12-22, Vol.358 (6370), p.1583-1587
    Description: Eleven hours after the detection of gravitational wave source GW170817 by the Laser Interferometer Gravitational-Wave Observatory and Virgo Interferometers, an associated optical transient, SSS17a, was identified in the galaxy NGC 4993. Although the gravitational wave data indicate that GW170817 is consistent with the merger of two compact objects, the electromagnetic observations provide independent constraints on the nature of that system. We synthesize the optical to near-infrared photometry and spectroscopy of SSS17a collected by the One-Meter Two-Hemisphere collaboration, finding that SSS17a is unlike other known transients. The source is best described by theoretical models of a kilonova consisting of radioactive elements produced by rapid neutron capture (the r-process). We conclude that SSS17a was the result of a binary neutron star merger, reinforcing the gravitational wave result.
    Subject(s): Natural history ; Neutron stars ; Observations
    ISSN: 0036-8075
    E-ISSN: 1095-9203
    Source: Single Journals
    Source: Academic Search Ultimate
    Source: Alma/SFX Local Collection
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  • 3
    Language: English
    In: IEEE transactions on magnetics, 2014-04, Vol.50 (4), p.1-4
    Description: It is well established that laser cutting or mechanical cutting of nonoriented electrical steel causes structural changes at the cutting edge, which finally affect the magnetic properties. During mechanical cutting, plastic deformation appears in the zone near the cutting edge. On the contrary, laser cutting induces thermal stress due to temperature gradients within the material during processing, which finally also results in deterioration of the magnetic properties. The knowledge of the type of the deterioration mechanism and the degree of the deterioration of magnetic property deterioration mechanisms is important for designing electrical machines in terms of magnetic field and loss calculations. In this paper, the effect of cutting on the magnetic flux distribution for mechanical cutting as well as solid state laser cutting is calculated and analyzed space-resolved using the data obtained from investigations by neutron grating interferometry. In addition, the resulting changes of magnetization behavior, i.e., the character of the B versus H curve, were studied. It will be demonstrated that the deterioration of the magnetic properties depends on the geometry of the parts at cutting. It is shown that the nature of the resulting spatial distribution of the magnetic flux is different for mechanical cutting and cutting by laser. By mechanical cutting, a drop of the magnetic flux in the region at the cutting edge appears. Through cutting by laser, the observed decrease of the magnetic flux B is observed over the total width of the strip. The decrease of B at cutting of small parts by laser is remarkably different at the cutting edges, which are opposite to each other. Finally, the observed magnetic behavior is correlated to the different character of the induced residual stresses by mechanical cutting and cutting by laser.
    Subject(s): Analysis ; Cross-disciplinary physics: materials science; rheology ; Exact sciences and technology ; Influence ; Iron compounds ; Laser beam cutting ; Magnetic domain walls ; Magnetic domains ; Magnetic hysteresis ; Magnetic properties ; Magnetization ; Magnetomechanical effects ; Materials science ; Other topics in materials science ; Physics ; Strips ; Thermal properties
    ISSN: 0018-9464
    E-ISSN: 1941-0069
    Source: IEEE Electronic Library (IEL)
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  • 4
    Language: English
    In: Science (American Association for the Advancement of Science), 2017-12-22, Vol.358 (6370), p.1556-1558
    Description: On 17 August 2017, the Laser Interferometer Gravitational-Wave Observatory (LIGO) and the Virgo interferometer detected gravitational waves (GWs) emanating from a binary neutron star merger, GW170817. Nearly simultaneously, the Fermi and INTEGRAL (INTErnational Gamma-Ray Astrophysics Laboratory) telescopes detected a gamma-ray transient, GRB 170817A. At 10.9 hours after the GW trigger, we discovered a transient and fading optical source, Swope Supernova Survey 2017a (SSS17a), coincident with GW170817. SSS17a is located in NGC 4993, an S0 galaxy at a distance of 40 megaparsecs. The precise location of GW170817 provides an opportunity to probe the nature of these cataclysmic events by combining electromagnetic and GW observations.
    Subject(s): Observations ; Supernovae
    ISSN: 0036-8075
    E-ISSN: 1095-9203
    Source: Single Journals
    Source: Academic Search Ultimate
    Source: Alma/SFX Local Collection
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  • 5
    Language: English
    Description: This book speaks to entrepreneurs who are interested in growing a business through purchasing and operating a well-known and respected franchise model, explaining the tools and strategies they need to not only become successful franchise owners (franchisees) but to achieve career-making franchise moves toward diversification of assets for the long term.
    Subject(s): Business enterprises-Purchasing ; Franchises (Retail trade)
    Source: eBook Academic Collection - Worldwide
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  • 6
    Language: English
    In: Climatic change, 2016-01, Vol.134 (1), p.15-28
    Description: Weather based index insurance is considered to be a potentially promising means of financial adaption to the challenges of climate change and variability; particularly for the agricultural sector in the developing world. However, comparatively little attention has been devoted to the analysis of the long-term viability of this adaptation mechanism in light of the interaction between changes in climate and the frequency of extreme events. Such changes in the frequency of extreme events are expected to have significant implications for the viability and pricing of index insurance over time. This question is analyzed in the context of hypothetical drought and flood index insurance contracts proposed for the West African Sahel using data from five Global Climate Models (GCMs) that were part of the Intergovernmental Panel on Climate Change’s (IPCC) 5th Coupled Model Inter-comparison Project (CMIP5). GCM derived trends in the mean and variance of the regional precipitation are integrated into a Monte Carlo simulation of the frequency of extreme seasonal drought and rainfall. Expected payout risk and the probability of 10 or more payouts in a 30-year window are modeled. The model results presented show significant pricing sensitivity to climate model parameters; particularly changes in the mean precipitation and strong multi-decadal variability. Further, within the Sahel region, there is a significant spatial heterogeneity between sub-regions. These findings imply that the utility and affordability of such index insurance contracts over time will be complex and heterogeneous over time and space.
    Subject(s): Atmospheric Sciences ; Climate Change/Climate Change Impacts ; Climatic changes ; Earth Sciences ; Environmental impact analysis ; Methods ; Models ; Risk assessment
    ISSN: 0165-0009
    E-ISSN: 1573-1480
    Source: Alma/SFX Local Collection
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  • 7
    Language: English
    In: Hydrology and earth system sciences, 2015-03-25, Vol.19 (3), p.1521-1545
    Description: Irrigation intensifies land use by increasing crop yield but also impacts water resources. It affects water and energy balances and consequently the microclimate in irrigated regions. Therefore, knowledge of the extent of irrigated land is important for hydrological and crop modelling, global change research, and assessments of resource use and management. Information on the historical evolution of irrigated lands is limited. The new global historical irrigation data set (HID) provides estimates of the temporal development of the area equipped for irrigation (AEI) between 1900 and 2005 at 5 arcmin resolution. We collected sub-national irrigation statistics from various sources and found that the global extent of AEI increased from 63 million ha (Mha) in 1900 to 111 Mha in 1950 and 306 Mha in 2005. We developed eight gridded versions of time series of AEI by combining sub-national irrigation statistics with different data sets on the historical extent of cropland and pasture. Different rules were applied to maximize consistency of the gridded products to sub-national irrigation statistics or to historical cropland and pasture data sets. The HID reflects very well the spatial patterns of irrigated land as shown on historical maps for the western United States (around year 1900) and on a global map (around year 1960). Mean aridity on irrigated land increased and mean natural river discharge on irrigated land decreased from 1900 to 1950 whereas aridity decreased and river discharge remained approximately constant from 1950 to 2005. The data set and its documentation are made available in an open-data repository at https://mygeohub.org/publications/8 (doi:10.13019/M20599).
    Subject(s): Analysis ; Aquatic resources
    ISSN: 1607-7938
    ISSN: 1027-5606
    E-ISSN: 1607-7938
    Source: Alma/SFX Local Collection
    Source: DOAJ Directory of Open Access Journals - Not for CDI Discovery
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  • 8
    Article
    Article
    2021
    ISSN: 0038-9145 
    Language: English
    In: Der Stahlbau, 2021-05-01, Vol.90 (5), p.325-325
    Description: Byline: Geralt Siebert
    ISSN: 0038-9145
    E-ISSN: 1437-1049
    Source: Alma/SFX Local Collection
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  • 9
    Language: English
    In: Hydrology and earth system sciences, 2019-03-11, Vol.23 (3), p.1375-1392
    Description: Submarine groundwater discharge (SGD) is highly variable in spatial and temporal terms due to the interplay of several terrestrial and marine processes. While discrete in situ measurements may provide a continuous temporal scale to investigate underlying processes and thus account for temporal heterogeneity, remotely sensed thermal infrared radiation sheds light on the spatial heterogeneity as it provides a continuous spatial scale. Here we report results of the combination of both the continuous spatial and temporal scales, using the ability of an unmanned aerial vehicle (UAV) to hover above a predefined location, and the continuous recording of thermal radiation of a coastal area at the Dead Sea (Israel). With a flight altitude of 65 m above the water surface resulting in a spatial resolution of 13 cm and a thermal camera (FLIR Tau2) that measures the upwelling long-wave infrared radiation at 4 Hz resolution, we are able to generate a time series of thermal radiation images that allows us to analyse spatio-temporal SGD dynamics. In turn, focused SGD spots, otherwise camouflaged by strong lateral flow dynamics, are revealed that may not be observed on single thermal radiation images. The spatiotemporal behaviour of an SGD-induced thermal radiation pattern varies in size and over time by up to 155 % for focused SGDs and by up to 600 % for diffuse SGDs due to different underlying flow dynamics. These flow dynamics even display a short-term periodicity of the order of 20 to 78 s for diffuse SGD, which we attribute to an interplay between conduit maturity-geometry and wave set-up.
    Subject(s): Analysis ; Geology ; Geosciences, Multidisciplinary ; Groundwater flow ; Observations ; Physical Sciences ; Science & Technology ; Water Resources
    ISSN: 1027-5606
    ISSN: 1607-7938
    E-ISSN: 1607-7938
    Source: Web of Science - Science Citation Index Expanded - 2019〈img src="http://exlibris-pub.s3.amazonaws.com/fromwos-v2.jpg" /〉
    Source: Alma/SFX Local Collection
    Source: DOAJ Directory of Open Access Journals - Not for CDI Discovery
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  • 10
    Language: English
    In: Fuzzy optimization and decision making, 2019-06-01, Vol.18 (2), p.175-197
    Description: The eigenvector method is one of the most used methods for deriving priorities of objects from multiplicative pairwise comparison matrices in Analytic Hierarchy Process (AHP). Fuzzy extension of AHP has been of much attention in order to capture uncertainty stemming from subjectivity of human thinking and from incompleteness of information that are integral to multi-criteria decision-making problems. Various fuzzy extensions of the eigenvector method have been introduced in order to derive fuzzy priorities of objects from fuzzy multiplicative pairwise comparison matrices. These fuzzy extensions are critically reviewed in this paper, and it is showed that (i) they violate multiplicative reciprocity of the related pairwise comparisons, (ii) they are not invariant under permutation of objects, (iii) the fuzzy maximal eigenvectors are not normalized, or (iv) a given normalized fuzzy maximal eigenvector does not consist of normalized maximal eigenvectors obtainable from multiplicative pairwise comparison matrices forming the fuzzy multiplicative pairwise comparison matrices. Afterwards, a new fuzzy extension of the eigenvector method based on the constrained fuzzy arithmetic is introduced and it is shown that it satisfies all four desirable properties.
    Subject(s): 90B50 ; Analysis ; Artificial Intelligence ; Calculus of Variations and Optimal Control; Optimization ; Computer Science ; Computer Science, Artificial Intelligence ; Constrained fuzzy arithmetic ; Decision-making ; Fuzzy maximal eigenvalue ; Fuzzy maximal eigenvector ; Fuzzy pairwise comparison matrix ; Mathematical Logic and Foundations ; Mathematics ; Methods ; Normalized fuzzy priorities ; Operations Research & Management Science ; Operations Research/Decision Theory ; Optimization ; Probability Theory and Stochastic Processes ; Science & Technology ; Technology
    ISSN: 1568-4539
    E-ISSN: 1573-2908
    Source: Business Source Ultimate
    Source: Web of Science - Science Citation Index Expanded - 2019〈img src="http://exlibris-pub.s3.amazonaws.com/fromwos-v2.jpg" /〉
    Source: Alma/SFX Local Collection
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