Browsing SINTEF Open by Author "Thorstensen, Jostein Bruun"

Now showing items 1-6 of 6

    • Adaptive Structured Light with Scatter Correction for High-Precision Underwater 3D Measurements 

      Risholm, Petter; Kirkhus, Trine; Thielemann, Jens T; Thorstensen, Jostein Bruun (Peer reviewed; Journal article, 2019)
      : High-precision underwater 3D cameras are required to automate many of the traditional subsea inspection, maintenance and repair (IMR) operations. In this paper we introduce a novel multi-frequency phase stepping ...

    • Design tool for TOF and SL based 3D cameras 

      Bouquet, Grégory; Thorstensen, Jostein Bruun; Bakke, Kari Anne Hestnes; Risholm, Petter (Journal article; Peer reviewed, 2017)
      Active illumination 3D imaging systems based on Time-of-flight (TOF) and Structured Light (SL) projection are in rapid development, and are constantly finding new areas of application. In this paper, we present a theoretical ...

    • High-quality dense 3D point clouds with active stereo and a miniaturizable interferometric pattern projector 

      Thorstensen, Jostein Bruun; Thielemann, Jens T; Risholm, Petter; Gjessing, Jo; Dahl-Hansen, Runar Plunnecke; Tschudi, Jon (Peer reviewed; Journal article, 2021)
      We have built and characterized a compact, simple and flexible 3D camera based on interferometric fringe projection and stereo reconstruction. The camera uses multi-frame active stereo as basis for 3D reconstruction, ...

    • Impact of illumination spectrum and eye pigmentation on image quality from a fundus camera using transscleral illumination 

      Stepanov, Alexey; Thorstensen, Jostein Bruun; Tschudi, Jon (Peer reviewed; Journal article, 2021)
      Significance: The use of the transscleral illumination approach has the potential to simplify the optical design of fundus cameras. In particular, this approach could allow the use of smaller and cheaper cameras that are ...

    • Real-time super-resolved 3D in turbid water using a fast range-gated CMOS camera 

      Risholm, Petter; Thorstensen, Jostein Bruun; Thielemann, Jens T; Kaspersen, Kristin; Tschudi, Jon; Yates, Chris; Softley, Chris; Abrosimov, Igor; Alexander, Jonathan; Haugholt, Karl Henrik (Journal article; Peer reviewed, 2018)
      We present a range-gated camera system designed for real-time (10 Hz) 3D estimation underwater. The system uses a fast-shutter CMOS sensor (1280×1024 1280×1024 ) customized to facilitate gating with 1.67 ns (18.8 cm in ...

    • Reliable Pb(Zr,Ti)O3-based thin film piezoelectric micromirrors for space-applications 

      Dahl-Hansen, Runar Plunnecke; Gjessing, Jo; Mardilovich, Peter; Fragkiadakis, Charalampos; Thorstensen, Jostein Bruun (Peer reviewed; Journal article, 2022)
      Although Pb(Zr,Ti)O3 (PZT) piezoelectric thin films are finding widespread applications on Earth, it is yet unclear if they are suitable for space-related applications. In space, their long-term reliability is a significant ...