• 6D pose estimation for subsea intervention in turbid waters 

      Mohammed, Ahmed; Kvam, Johannes; Thielemann, Jens T; Haugholt, Karl H.; Risholm, Petter (Peer reviewed; Journal article, 2021)
      Manipulation tasks on subsea instalments require extremely precise detection and localization of objects of interest. This problem is referred to as “pose estimation”. In this work, we present a framework for detecting and ...
    • 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 ...
    • Automatic length estimation of free-swimming fish using an underwater 3D range-gated camera 

      Risholm, Petter; Mohammed, Ahmed Kedir; Kirkhus, Trine; Clausen, Sigmund; Vasilyev, Leonid; Folkedal, Ole; Johnsen, Øistein; Haugholt, Karl Henrik; Thielemann, Jens T (Peer reviewed; Journal article, 2022)
      Camera estimation of fish size in aquaculture production and fisheries is crucial for enabling knowledge-based decision making. Automatic estimation of fish lengths on an individual and population basis are key steps to ...
    • Bruk av droner i nordområdene 

      Bakken, Trond; Johnsen, Stig Ole; Holmstrøm, Sture; Merz, Mariann; Transeth, Aksel Andreas; Grøtli, Esten Ingar; Risholm, Petter; Storvold, Rune (SINTEF rapport;2019:01284, Research report, 2019)
      Formålet med denne rapporten er å vise eksempler på bruk av fjernstyrte og autonome droner i petroleumssektoren og vise hvilke utviklingstrender innen droneteknologi som er viktige. Utfordringer og muligheter for bruk av ...
    • 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 ...
    • Kartlegging av status og potensiale for dronebasert teknologi. Anvendelser innen naturfare og infrastruktur 

      Grøtli, Esten Ingar; Transeth, Aksel Andreas; Gylland, Anders Samstad; Risholm, Petter; Bergh, Ida Soon Brøther (SINTEF Rapport;, Research report, 2014)
      NIFS (Naturfare, Infrastruktur, Flom og Skred) er et felles satsingsområde mellom etatene Jernbaneverket, Norges vassdrags- og energidirektorat og Statens vegvesen. På vegne av NIFS har SINTEF utført en kartlegging av ...
    • Range-Gated Imaging System for Underwater Monitoring in Ocean Environment 

      Mariani, Patrizio; Quincoces, Inaki; Haugholt, Karl Henrik; Chardard, Yves; Visser, André W.; Yates, Chris; Piccino, Giuliano; Reali, Giancarlo; Risholm, Petter; Thielemann, Jens T (Journal article; Peer reviewed, 2018)
      High-quality video observations are very much needed in underwater environments for the monitoring of several ecosystem indicators and to support the sustainable development and management of almost all activities in the ...
    • 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 ...
    • SEAVENTION - Autonomous underwater intervention 

      Transeth, Aksel Andreas; Risholm, Petter; Bjerkeng, Magnus Christian; Hegde, Jeevith (Lecture, 2018)