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Browsing by Department "Rafmagns- og tölvuverkfræðideild (HÍ)"

Browsing by Department "Rafmagns- og tölvuverkfræðideild (HÍ)"

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  • Ulfarsson, Magnus; Walters, G B; Gústafsson, O; Steinberg, S; Silva, A; Doyle, O M; Brammer, M; Gudbjartsson, Daniel; Arnarsdóttir, S; Jonsdottir, Gudbjorg; Gísladóttir, R S; Bjornsdottir, Gyda; Helgason, H; Ellingsen, L M; Halldórsson, J G; Sæmundsen, Evald E.; Stefánsdóttir, B; Jónsson, L; Eiríksdóttir, V K; Eiríksdóttir, G R; Jóhannesdóttir, G H; Unnsteinsdóttir, U; Jónsdóttir, B; Magnúsdóttir, B B; sulem, patrick; Þorsteinsdóttir, Unnur; Sigurðsson, E; Brandeis, D; Meyer-Lindenberg, A; Stefánsson, H; Stefansson, Kari (Springer Nature, 2017-04-25)
    Several copy number variants have been associated with neuropsychiatric disorders and these variants have been shown to also influence cognitive abilities in carriers unaffected by psychiatric disorders. Previously, we associated the 15q11.2(BP1–BP2) ...
  • Aufaristama, Muhammad; Höskuldsson, Ármann; Ulfarsson, Magnus; Jónsdóttir, Ingibjörg; Thordarson, Thorvaldur (MDPI AG, 2019-02-26)
    The Holuhraun lava flow was the largest effusive eruption in Iceland for 230 years, with an estimated lava bulk volume of ~1.44 km3 and covering an area of ~84 km2. The six month long eruption at Holuhraun 2014–2015 generated a diverse surface environment. ...
  • Lv, Zhiyong; Zhang, Penglin; Benediktsson, Jon Atli (MDPI AG, 2017-03-17)
    Aerial image classification has become popular and has attracted extensive research efforts in recent decades. The main challenge lies in its very high spatial resolution but relatively insufficient spectral information. To this end, spatial-spectral ...
  • Shao, Muhan; Han, Shuo; Carass, Aaron; Li, Xiang; Blitz, Ari M.; Shin, Jaehoon; Prince, Jerry L.; Ellingsen, Lotta María (Elsevier BV, 2019)
    Numerous brain disorders are associated with ventriculomegaly, including both neuro-degenerative diseases and cerebrospinal fluid disorders. Detailed evaluation of the ventricular system is important for these conditions to help understand the pathogenesis ...
  • Zhu, Kaiqiang; Chen, Yushi; Ghamisi, Pedram; Jia, Xiuping; Benediktsson, Jon Atli (MDPI AG, 2019-01-22)
    Capsule networks can be considered to be the next era of deep learning and have recently shown their advantages in supervised classification. Instead of using scalar values to represent features, the capsule networks use vectors to represent features, ...
  • Liu, Jun; Luo, Bin; Douté, Sylvain; Chanussot, Jocelyn (MDPI AG, 2018-05-10)
    We propose to replace traditional spectral index methods by unsupervised spectral unmixing methods for the exploration of large datasets of planetary hyperspectral images. The main goal of this article is to test the ability of these analysis techniques ...
  • Ghamisi, Pedram; Souza, Roberto; Benediktsson, Jon Atli; Zhu, Xiao Xiang; Rittner, Leticia (IEEE, 2016-07-18)
    Email Print Request Permissions With respect to recent advances in remote sensing technologies, the spatial resolution of airborne and spaceborne sensors is getting finer, which enables us to precisely analyze even small objects on the Earth. This ...
  • Ghamisi, Pedram; Benediktsson, Jon Atli (IEEE Geoscience & Remote Sensing Society, 2015-02)
    A new feature selection approach that is based on the integration of a genetic algorithm and particle swarm optimization is proposed. The overall accuracy of a support vector machine classifier on validation samples is used as a fitness value. The new ...
  • Pedersen, Gro; Belart, Joaquín M. C.; Magnússon, Eyjólfur; Vilmundardóttir, Olga Kolbrún; Kizel, Fadi; Sigurmundsson, Friðþór Sófus; Gísladóttir, Guðrún; Benediktsson, Jon Atli (American Geophysical Union (AGU), 2018-02-22)
    Lava flow thicknesses, volumes, and effusion rates provide essential information for understanding the behavior of eruptions and their associated deformation signals. Preeruption and posteruption elevation models were generated from historical stereo ...
  • Pedersen, Gro; Montalvo, Jorge; Einarsson, Páll; Vilmundardóttir, Olga Kolbrún; Sigurmundsson, Friðþór Sófus; Belart, Joaquín M. C.; Hjartardottir, Asta Rut; Kizel, Fadi; Rustowicz, Rose; Falco, Nicola; Gísladóttir, Guðrún; Benediktsson, Jon Atli (Iceland Glaciological Society and Geoscience Society of IcelandJöklarannsóknafélags Íslands og Jarðfræðafélags Íslands, 2018)
    Hekla volcano is known to have erupted at least 23 times in historical time (last 1100 years); often producing mixed eruptions of tephra and lava. The lava flow volumes from the 20th century have amounted 80% to almost 100% of the entire erupted ...
  • Rasti, Behnood; Ghamisi, Pedram; Ulfarsson, Magnus (MDPI AG, 2019-01-10)
    In this paper, we develop a hyperspectral feature extraction method called sparse and smooth low-rank analysis (SSLRA). First, we propose a new low-rank model for hyperspectral images (HSIs) where we decompose the HSI into smooth and sparse components. ...
  • Huang, Zhihong; Li, Shutao; Fang, Leyuan; Li, Huali; Benediktsson, Jon Atli (Institute of Electrical and Electronics Engineers (IEEE), 2018)
    Hyperspectral image (HSI) is usually corrupted by various types of noise, including Gaussian noise, impulse noise, stripes, deadlines, and so on. Recently, sparse and low-rank matrix decomposition (SLRMD) has demonstrated to be an effective tool in ...
  • Palsson, Burkni; Sigurdsson, Jakob; Sveinsson, Jóhannes Rúnar; Ulfarsson, Magnus (Institute of Electrical and Electronics Engineers (IEEE), 2018)
    In this paper, we present a deep learning based method for blind hyperspectral unmixing in the form of a neural network autoencoder. We show that the linear mixture model implicitly puts certain architectural constraints on the network, and it effectively ...
  • Palsson, Frosti (University of Iceland, School of Engineering and Natural Sciences, Faculty of Electrical and Computer Engineering, 2017-09)
    In remote sensing, acquired optical images of high spectral resolution have usually a lower spatial resolution than images of lower spectral resolution. This is due to physical, cost and complexity constraints. To make the most of the available imagery, ...
  • Benediktsson, Jon Atli; Ghamisi, Pedram; Couceiro, Micael S.; Fauvel, Mathieu (IEEE, 2014)
    A new spectral-spatial method for classification of hyperspectral images is introduced. The proposed approach is based on two segmentation methods, fractional-order Darwinian particle swarm optimization and mean shift segmentation. The output of these ...
  • Lv, Zhiyong; Liu, Tongfei; Zhang, Penglin; Benediktsson, Jon Atli; Chen, Yixiang (MDPI AG, 2018-06-08)
    Land cover change detection (LCCD) based on bi-temporal remote sensing images plays an important role in the inventory of land cover change. Due to the benefit of having spatial dependency properties within the image space while using remote sensing ...
  • Aufaristama, Muhammad; Höskuldsson, Ármann; Ulfarsson, Magnus; Jónsdóttir, Ingibjörg; Thordarson, Thorvaldur (MDPI AG, 2020-03-31)
    Roughness can be used to characterize the morphologies of a lava flow. It can be used to identify lava flow features, provide insight into eruption conditions, and link roughness pattern across a lava flow to emplacement conditions. In this study, we ...
  • Walters, G. Bragi; Gústafsson, Ómar; Sveinbjornsson, Gardar; Eiriksdottir, Valgerdur Kristin; Ágústsdóttir, Arna B.; Jónsdóttir, Guðrún A.; Steinberg, Stacy; Gunnarsson, Árni F.; Magnússon, Magnús I.; Unnsteinsdóttir, Unnur; Lee, Amy L.; Jónasdóttir, Aðalbjörg; Sigurðsson, Ásgeir; Jónasdóttir, Áslaug; Skúladóttir, Ástrós; Jonsson, Lina; Nawaz, Muhammad S.; Sulem, Patrick; Frigge, Mike; Ingason, Andrés; Love, Askell; Norðdahl, Guðmundur L.; Zervas, Mark; Gudbjartsson, Daniel; Ulfarsson, Magnus; Sæmundsen, Evald E.; Stefansson, Hreinn; Stefansson, Kari (Springer Science and Business Media LLC, 2018-08-27)
    Discovery of coding variants in genes that confer risk of neurodevelopmental disorders is an important step towards understanding the pathophysiology of these disorders. Wholegenome sequencing of 31,463 Icelanders uncovers a frameshift variant ...
  • Benediktsson, Jon Atli; Ghamisi, Pedram; Martins, Fernando M. L.; Couceiro, Micael S. (IEEE, 2014)
    Hyperspectral remote sensing images contain hundreds of data channels. Due to the high dimensionality of the hyperspectral data, it is difficult to design accurate and efficient image segmentation algorithms for such imagery. In this paper, a new ...
  • Lv, ZhiYong; Liu, TongFei; Benediktsson, Jon Atli; Lei, Tao; Wan, YiLiang (MDPI AG, 2018-11-15)
    To improve the performance of land-cover change detection (LCCD) using remote sensing images, this study utilises spatial information in an adaptive and multi-scale manner. It proposes a novel multi-scale object histogram distance (MOHD) to measure the ...