Robust Vision Using Retro Reflective Markers for Remote Handling in ITER
The International Thermonuclear Experimental Reactor (ITER)'s working environment is characterized by extreme conditions, that deem maintenance and inspection tasks to be carried out through remote handling. 3D Node is a hardware/software module that extracts critical information from the remote environment during fine alignment tasks using an eye-in-hand camera system and updates the models behind the virtual reality-based remote handling platform. In this work we develop a retro-reflective marker-based version of 3D Node that estimates the pose of a planar target, the knuckle of the cassette locking system, using the markers attached to its surface. We demonstrate a pin-tool insertion task using these methods. Results show that our approach works reliably with a single low-resolution camera and outperforms the previously researched stereo depth estimation based approaches. We conclude that retro-reflective marker-based tracking has the potential to be a key enabler for remote handling operations in ITER.
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