Sökning: "3D Reconstruction"

Visar resultat 1 - 5 av 77 avhandlingar innehållade orden 3D Reconstruction.

  1. 1. Positron Emission Tomography with Three-Dimensional Reconstruction

    Detta är en avhandling från Radiation Physics, Lund

    Författare :Kjell Erlandsson; [1996]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; radiology; Clinical physics; quantitation; reconstruction; three-dimensional; tomography; positron; emission; 3D; PET; medical instrumentation; Klinisk fysiologi; radiologi; tomografi; medicinsk instrumentering;

    Sammanfattning : In this thesis, the developments of two different low-cost scanners for positron emission tomography (PET) based on 3D acquisition, are presented. 3D reconstruction methods for these systems are also presented. LÄS MER

  2. 2. Towards unbiased 3D reconstruction in single-particle cryo-electron microscopy

    Detta är en avhandling från Stockholm : KTH

    Författare :Dominika Elmlund; KTH.; [2010]

    Sammanfattning : Cryo-electron microscopy of freestanding molecules (single-particles) plays a pivotal role in the difficult and pressing challenge of determining the structures of large macromolecular complexes. Molecular volumes are generated by aligning large sets of randomly oriented two-dimensional (2D) projection images in three dimensions (3D) before reconstruction is performed using tomographic techniques. LÄS MER

  3. 3. 3D Electron crystallography Real space reconstruction and reciprocal space tomography

    Detta är en avhandling från Stockholm : Department of Materials and Environmental Chemistry (MMK), Stockholm University

    Författare :Daliang Zhang; Stockholms universitet.; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Electron crystallography; Electron microscopy; Porous materials; NATURAL SCIENCES Chemistry; NATURVETENSKAP Kemi; Structural Chemistry; strukturkemi;

    Sammanfattning : Electron crystallography is an important technique for studying micro- and nano-sized materials. It has two important advantages over X-ray crystallography for structural studies: 1) crystals millions of times smaller than those needed for X-ray diffraction can be studied; 2) it is possible to; focus the electrons to form an image. LÄS MER

  4. 4. Wireless Channel Modeling and Reconstruction in Massive MIMO Systems

    Detta är en avhandling från Univeristy of Otago

    Författare :Aleksei Fedorov; Lund University.; Lunds universitet.; [2019]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; channel modeling; 5G; 4G; LTE; MIMO; massive MIMO; localization; channel reconstruction; channel prediction; channel estimation; pilot contamination; phase noise; antenna array; orientation reconstruction; orientation estimation; channel inference; 3D channel modeling; realistic channel modeling; phase shifting; RACH synchronization; massive MIMO emulation; location estimation; system identification;

    Sammanfattning : The past few years have witnessed dramatic growth in the number of wirelessly connected devices, which will continue to increase in the future. Following this trend, the capacity of the wireless networks has been enhanced to provide high-quality service to tens of billions of devices. LÄS MER

  5. 5. Optimization Methods for 3D Reconstruction : Depth Sensors, Distance Functions and Low-Rank Models

    Detta är en avhandling från Department of Mathematics, Lund University

    Författare :Erik Bylow; Lund University.; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; Lunds universitet.; [2018]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Computer Vision; 3D Reconstruction;

    Sammanfattning : This thesis explores methods for estimating 3D models using depth sensors andfinding low-rank approximations of matrices. In the first part we focus on how toestimate the movement of a depth camera and creating a 3D model of the scene. LÄS MER