Thesis - Deflectometry for industrial measurements of reflective surfaces



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In industrial inspection one often aims to measure the shape and dimensions of an object. Here at IVP we have a strong background and history in the use of laser triangulation for creating 3D images which can then be processed to find defects in products or processes in the industry. However, laser triangulation struggles with shiny and reflective materials. There’s research into the use of deflectometry, where one uses the fact that the object is shiny, letting a pattern mirror off the surface and look at it with a camera and from that reconstruct the shape.

This thesis proposes the question, can deflectometry be used as an alternative, or complimentary measurement method when objects are shiny / highly reflective. Questions for this thesis could include:

  • How does one calibrate this system to produce millimeter values?
  • Benefits and drawbacks of various projection patterns?
  • How does the method fare with complex objects? (Non-planar surfaces and concave objects).
  • How does the method perform in terms of accuracy compared to traditional laser triangulation?


This thesis will require knowledge in image processing, mathematics, and visualization and will give the opportunity of working with real hardware to solve industry close and relevant problems.


For more information about the position, contact:

Jens Edhammer, Application Developer,


Charlotte Axelsson, HR Manager,

Welcome with your application 14th of October at the latest!

SICK is a world-leading supplier of sensors and sensor solutions for industrial applications. We are 11 000 employees in 50 countries and our headquarter is located in Freiburg, Germany. SICK in Linköping is an innovation center for Machine Vision and we are 80 committed employees with a big interest in image processing and visualization. For more than 35 years, our team at SICK Linköping has successfully developed and delivered software for technically leading products within the field of 2D and 3D vision, as well as system solutions for i.e. robot guidance and quality control.

At SICK in Linköping, we are very proud of being a healthy and attractive workplace. For many years, we have been elected as one of the best workplaces in Sweden according to the survey Great Place to Work, the latest award is from 2021. We work actively to reduce our climate footprint and we are active in various ways to contribute to the society and to increase diversity at our workplace.





Responsible recruiter

Charlotte Axelsson


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