4,972 research outputs found
Precise localization for aerial inspection using augmented reality markers
The final publication is available at link.springer.comThis chapter is devoted to explaining a method for precise localization using augmented reality markers. This method can achieve precision of less of 5 mm in position at a distance of 0.7 m, using a visual mark of 17 mm Ă— 17 mm, and it can be used by controller when the aerial robot is doing a manipulation task. The localization method is based on optimizing the alignment of deformable contours from textureless images working from the raw vertexes of the observed contour. The algorithm optimizes the alignment of the XOR area computed by means of computer graphics clipping techniques. The method can run at 25 frames per second.Peer ReviewedPostprint (author's final draft
Hypergraph-Transformer (HGT) for Interactive Event Prediction in Laparoscopic and Robotic Surgery
Understanding and anticipating intraoperative events and actions is critical
for intraoperative assistance and decision-making during minimally invasive
surgery. Automated prediction of events, actions, and the following
consequences is addressed through various computational approaches with the
objective of augmenting surgeons' perception and decision-making capabilities.
We propose a predictive neural network that is capable of understanding and
predicting critical interactive aspects of surgical workflow from
intra-abdominal video, while flexibly leveraging surgical knowledge graphs. The
approach incorporates a hypergraph-transformer (HGT) structure that encodes
expert knowledge into the network design and predicts the hidden embedding of
the graph. We verify our approach on established surgical datasets and
applications, including the detection and prediction of action triplets, and
the achievement of the Critical View of Safety (CVS). Moreover, we address
specific, safety-related tasks, such as predicting the clipping of cystic duct
or artery without prior achievement of the CVS. Our results demonstrate the
superiority of our approach compared to unstructured alternatives
Motion analysis report
Human motion analysis is the task of converting actual human movements into computer readable data. Such movement information may be obtained though active or passive sensing methods. Active methods include physical measuring devices such as goniometers on joints of the body, force plates, and manually operated sensors such as a Cybex dynamometer. Passive sensing de-couples the position measuring device from actual human contact. Passive sensors include Selspot scanning systems (since there is no mechanical connection between the subject's attached LEDs and the infrared sensing cameras), sonic (spark-based) three-dimensional digitizers, Polhemus six-dimensional tracking systems, and image processing systems based on multiple views and photogrammetric calculations
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