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Auflistung nach Autor:in "Letter, Maximilian"

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  • Konferenzbeitrag
    Increasing Realism of Displayed Vibrating AR Objects through Edge Blurring
    (Mensch und Computer 2023 - Tagungsband, 2023) Kurzweg, Marco; Letter, Maximilian; Wolf, Katrin
    Many standard AR devices, such as the HoloLens2, have limitations in displaying fast motions, like the ones required to visualize moving or vibrating objects. One reason for this is the low computing power compared to other technologies, resulting in frame rate drops. Further, established visualization enhancement methods, such as anti-aliasing, cannot be applied because of their high computational demands. Therefore, we have looked at possible alternatives on the HoloLens2 for displaying vibrations more realistically as long as these technical limitations exist. We have chosen to examine vibrations as they are widely used for different use cases, like creating feedback, communicating the success of interactions, and generating a better scene understanding. In a user study, three different effects were evaluated against a baseline method, which was the representation of a vibration using a sinus function to calculate the displacement of the object. We found that an effect where the edges of the AR object are blurred (continuously with changing intensity) is perceived as significantly more realistic than other effects and the baseline method.
  • Konferenzbeitrag
    Pull Outperforms Push as Vibrotactile Wristband Feedback for Mid-Air Gesture Guidance
    (Mensch und Computer 2023 - Tagungsband, 2023) Willms, Jan; Letter, Maximilian; Marchandise, Emile; Wolf, Katrin
    The use of mid-air gestures to control interactive systems is becom- ing increasingly important, particularly in mixed reality scenarios. However, these gestures are not always intuitive and can be chal- lenging to learn as they lack visual guidance. Therefore, it is crucial to explore strategies to improve the learnability of these gestures. In this work, it is investigated how a vibration stimulus can be applied at the forearm to guide a person in performing a gesture. Utilizing a prototypical wristband with 24 vibrotactile actuators, the metaphors pull and push, representing attractive and repulsive feedback, were compared against each other. Results of a controlled user study show that participants perform significantly better with the pull metaphor, completing gestures faster, and make fewer er- rors. In line with this, the majority stated a subjective preference towards pull after experiencing both metaphors.